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Patterns and drivers of vegetation resilience across China and the negative impact of warm droughts 认领 引用
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作者 Xueming Zhao Zhaoju Zheng +4 位作者 Bernhard Schmid Yujin Zhao Dan Zhao Bingfang Wu Yuan Zeng 《Geography and Sustainability》 CSCD 2026年第3期63-75,共13页
Ecological resilience—defined as the capacity of ecosystems to withstand perturbations—is an important dimension of ecosystem stability.However,the spatial patterns and underlying drivers of resilience in forests re... Ecological resilience—defined as the capacity of ecosystems to withstand perturbations—is an important dimension of ecosystem stability.However,the spatial patterns and underlying drivers of resilience in forests relative to grasslands remain poorly understood.Using a temporal autocorrelation index(AC1)derived from satellite-based vegetation indices,we assessed high-resolution(250 m)vegetation resilience from 2000 to 2020 across China's natural terrestrial vegetation.We found that vegetation in forest-dominated regions was more resilient than in grassland-dominated regions,with divergent associations to climate,vegetation,soil,topography,and human drivers.Specifically,forest resilience was primarily associated with climate variables,with path analysis indicating a potential indirect link through vegetation characteristics.By contrast,grassland resilience was strongly related to soil and topographic properties.Particularly,among the climate variables examined,long-term warm drought condition,represented by the negative of Standardized Precipitation Evapotranspiration Index(SPEI),generally showed spatial negative associations with resilience,especially in temperate steppe and subtropical forest regions.Notably,the resilience of cold forests and high-altitude grasslands showed weaker or even positive relationship with warm droughts.These findings highlight the threats posed by ongoing climate change to vegetation resilience,and emphasize the need for ecosystem-specific strategies to enhance resilience in the future. 展开更多
关键词 Ecological resilience Temporal autocorrelation Warm droughts Remote sensing Vegetation index
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Propagation patterns of hydrological droughts in the source region of Yellow River:Insights from standardized versus threshold‐based approaches 认领 引用
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作者 Jiefeng Wu Huaxia Yao +5 位作者 Pengyu An Qiangkun Li Jinxu Han Dejian Zhang Xuemei Li Guoqing Wang 《River》 EI CSCD 2026年第1期55-68,共14页
Understanding the propagation patterns of hydrological droughts is crucial for drought prevention,disaster mitigation,and water resource management.Two common methodological frameworks are employed:standardized indice... Understanding the propagation patterns of hydrological droughts is crucial for drought prevention,disaster mitigation,and water resource management.Two common methodological frameworks are employed:standardized indices,represented by the Standardized Streamflow Index(SSI),and threshold‐based(nonstandardized)indices,represented by the variable drought threshold(VDT)and fixed drought threshold(FDT).However,differences and similarities between these two types of methods in identifying hydrological droughts and characterizing their propagation patterns(e.g.,onset,peak intensity,and termination)have not been systematically examined.To address this gap,the source region of Yellow River basin(SRYB),an area with relatively limited human influence,is selected as a case study.The results reveal several key similarities and distinctions:(i)The average duration of hydrological droughts during 1956–2022 is similar between SSI and VDT,but significantly longer when identified by FDT.The average severity derived from FDT is lower than that from VDT.(ii)All three methods effectively capture the spatial propagation behavior of hydrological droughts across the SRYB,which generally exhibits a decreasing intensity from upstream to downstream.(iii)Marked differences exist in the intra‑annual timing of event occurrences:SSI and VDT show an approximately even monthly distribution,whereas FDT indicates a pronounced concentration of drought events in low‐flow periods.(iv)The onset,peak intensity,and termination of hydrological droughts identified by FDT align well with wet‐dry transitions,a feature not reflected in the results from SSI or VDT.(v)These discrepancies stem from the“relative”nature of SSI and VDT—which evaluate drought events against reference‐period thresholds,leading to similar average durations and uniform seasonal distributions—and the“absolute”nature of FDT,which uses inherent low‐flow thresholds,resulting in longer durations,reduced severity,seasonal concentration,and better alignment with wet‐dry transitions.This study provides critical and actionable insights for selecting appropriate hydrological drought identification methods,thereby supporting sustainable water resource management and enhancing water security under drought conditions. 展开更多
关键词 drought indices drought mitigation evolution patterns methodological comparison
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Spatiotemporal characteristics and onset processes of flash droughts during the growing season in Inner Mongolia,China 认领 引用
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作者 LIU Hongyu XIE Yunhu HAI Quansheng 《Journal of Mountain Science》 SCIE CSCD 2026年第1期139-155,共17页
Flash droughts(FDs)develop quickly and can rapidly deplete soil moisture,posing significant threats to agriculture and pastoral systems.To investigate the spatiotemporal characteristics and development mechanisms of F... Flash droughts(FDs)develop quickly and can rapidly deplete soil moisture,posing significant threats to agriculture and pastoral systems.To investigate the spatiotemporal characteristics and development mechanisms of FDs in Inner Mongolia,China,and to assess the roles of key meteorological drivers in driving soil moisture variability,FD events were identified using root-zone soil moisture data during the growing seasons from 1982 to 2022.The results indicate the presence of five FD hotspot regions,located in the southern Alxa Plateau,the Hetao Plain in Bayannur,the northwestern Xilingol Plain,the western Liaohe River Plain,and the northern Da Hinggan Ling.Over 41 years,FDs occurred on average 7.44 events across the study area,with a mean duration of 9.17 pentads(1 pentad equals 5 days).The duration exhibited a significant increasing trend of 0.39 pentads/10 years.FD onsets primarily lasted for 2-3 pentads.During the FD development phase,precipitation and evapotranspiration decreased while temperature,potential evapotranspiration,incoming solar radiation,and vapor pressure deficit increased.The dominant meteorological drivers of FD development exhibited notable spatial heterogeneity across hotspot regions,and vapor pressure deficit consistently was the most influential factor.These findings improve the understanding of climate drivers at different stages of FD development and provide scientific support for early warning and prevention of droughts in Inner Mongolia. 展开更多
关键词 Flash drought Meteorological drivers XGBoost Inner Mongolia
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Spatiotemporal changes and interconnections between meteorological and hydrological droughts in China over past 34 years 认领 引用 被引量：9
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作者 Ke Zhang Zhi-lin Li +3 位作者 Wu-zhi Shi Ran Tao Xu Yang Yi-ming Huang 《Water Science and Engineering》 EI CAS CSCD 2025年第3期274-287,共14页
Understanding the evolution and lag effects of droughts is critical to effective drought warning and water resources management.However,due to limited hydrological data,few studies have examined hydrological droughts ... Understanding the evolution and lag effects of droughts is critical to effective drought warning and water resources management.However,due to limited hydrological data,few studies have examined hydrological droughts and their lag time from meteorological droughts at a daily scale.In this study,precipitation data were collected to calculate the standardized precipitation index(SPI),and runoff data simulated by the variable infiltration capacity(VIC)model were utilized to compute the standardized runoff index(SRI).The three-threshold run theory was used to identify drought characteristics in China.These drought characteristics were utilized to investigate spatiotemporal variations,seasonal trends,and temporal changes in areas affected by meteorological and hydrological droughts.Additionally,the interconnections and lag effects between meteorological and hydrological droughts were explored.The results indicated that(1)drought occurred during approximately 28%of the past 34 years in China;(2)drought conditions tended to worsen in autumn and weaken in winter;(3)drought-affected areas shifted from northwest to northeast and finally to southern China;and(4)the correlation between meteorological and hydrological droughts was lower in the northwest and higher in the southeast,with all correlation coefficients exceeding 0.7.The lag times between meteorological and hydrological droughts were longest(5 d)in the Yangtze River,Yellow River,and Hai River basins,and shortest(0 d)in the Tarim River Basin.This study provides a scientific basis for effective early warning of droughts. 展开更多
关键词 Drought characteristic Meteorological drought Hydrological drought Lag time VIC
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Radial growth of Platycladus orientalis Linn. and its growth resilience after extreme droughts along a precipitation gradient 认领 引用
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作者 CHE Cunwei ZHANG Mingjun +4 位作者 XIAO Shengchun YANG Wanmin WANG Shengjie WANG Zhilan SUN Meiling 《Journal of Arid Land》 SCIE CSCD 2025年第3期381-393,共13页
Under current climate warming, the growth resilience of plantation forests after extreme droughts has garnered increasing attention. Platycladus orientalis Linn. is an evergreen tree species commonly used for afforest... Under current climate warming, the growth resilience of plantation forests after extreme droughts has garnered increasing attention. Platycladus orientalis Linn. is an evergreen tree species commonly used for afforestation, and the stability of P. orientalis plantation forests in the Loess Hilly region directly affects the ecological and environmental security of the entire Loess Plateau of China.However, systematic analyses of the growth resilience of P. orientalis plantation forests after extreme droughts along precipitation gradients remain scarce. In this study, we collected tree ring samples of P.orientalis along a precipitation gradient(255, 400, and 517 mm) from 2021 to 2023 and used dendroecological methods to explore the growth resilience of P. orientalis to drought stress on the Loess Plateau. Our findings revealed that the growth resilience of P. orientalis increased with increasing precipitation, enabling the trees to recover to the pre-drought growth levels. In regions with low precipitation(255 mm), the plantation forests were more sensitive to extreme droughts, struggling to recover to previous growth levels, necessitating conditional artificial irrigation. In regions with medium precipitation(400 mm), the growth of P. orientalis was significantly limited by drought stress and exhibited some recovery ability after extreme droughts, therefore warranting management through rainwater harvesting and conservation measures. Conversely, in regions with high precipitation(517 mm), the impacts of extreme droughts on P. orientalis plantation forests were relatively minor. This study underscored the need for targeted strategies tailored to different precipitation conditions rather than a "one-size-fits-all" approach to utilize precipitation resources effectively and maximize the ecological benefits of plantation forests. The findings will help maintain the stability of plantation forests and improve their ecosystem service functions in arid and semi-arid areas. 展开更多
关键词 Platycladus orientalis tree ring extreme drought growth resilience precipitation gradient Loess Plateau
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Spatiotemporal variations and driving mechanisms of flash droughts during 1981-2020 in the Qilian Mountains,China 认领 引用 被引量：2
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作者 BAI Junhong WANG Jianglin +1 位作者 CHEN Jie WANG Xuejia 《Journal of Arid Land》 SCIE CSCD 2025年第4期481-499,共19页
Flash drought is characterized by a period of rapid drought intensification with impacts on agriculture,water resources,ecosystems,and human environment.In the Qilian Mountains,northwestern China,flash droughts are be... Flash drought is characterized by a period of rapid drought intensification with impacts on agriculture,water resources,ecosystems,and human environment.In the Qilian Mountains,northwestern China,flash droughts are becoming more frequently due to the global climate warming.However,the spatiotemporal variations and their driving factors of flash droughts are not clear in this region.In this study,the European Centre for Medium-range Weather Forecasts(ECMWF)Reanalysis v5-Land(ERA5-Land)dataset was utilized to identify two types of flash drought events(heatwave-induced and water scarcity-induced flash drought events)that occurred in the growing season(April‒September)during 1981-2020 in this area.The results showed that the frequency of heatwave-induced flash droughts has decreased since 2010,while the frequency of water scarcity-induced flash droughts has declined markedly.Spatially,heatwave-induced flash droughts were predominantly concentrated in the western Qilian Mountains,whereas water scarcity-induced flash droughts were primarily concentrated in the central and eastern Qilian Mountains.A significantly increasing temporal trend in both types of flash droughts in the eastern Qilian Mountains was found.Meanwhile,there was a decreasing temporal trend of heatwave-induced flash droughts in the southwestern part of the region.Additionally,the influence of two major atmospheric modes,i.e.,the El Niño‒Southern Oscillation(ENSO)and North Atlantic Oscillation(NAO),on these two types of flash droughts was explored by the Superposed Epoch Analysis.The ENSO mainly influences flash droughts in the central and eastern parts of the Qilian Mountains by altering the strength of the East Asian monsoon,while the NAO mainly affects flash droughts in the entire parts of the Qilian Mountains by inducing anomalous westerlies activity.Our findings have important implications for predicting the evolution of flash drought events in the Qilian Mountains region under continued climate warming. 展开更多
关键词 heatwave-induced flash drought water scarcity-induced flash drought El Niño‒Southern Oscillation(ENSO) North Atlantic Oscillation(NAO) Superposed Epoch Analysis(SEA) wavelet coherence
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Response of Decadal Droughts on the Mongolian Plateau to External Forcings and Internal Variability over the Last Millennium 认领 引用
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作者 Guangyao HAO Weiyi SUN +2 位作者 Jian LIU Liang NING Mi YAN 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2025年第8期1715-1726,共12页
Since the mid-20th century,the Mongolian Plateau(MP)has experienced decadal droughts coupled with extreme heatwaves,severely affecting regional ecology and social development.However,the mechanisms behind these decada... Since the mid-20th century,the Mongolian Plateau(MP)has experienced decadal droughts coupled with extreme heatwaves,severely affecting regional ecology and social development.However,the mechanisms behind these decadalscale compound heatwavedrought events remain debated.Here,using reconstructions and simulations from the Community Earth System Model Last Millennium Ensemble,we demonstrate that,over the last millennium,decadal droughts on the MP occurred under both warm and cold conditions,differing from recent compound heatwavedrought events.We found that by examining temperature changes during these drought periods,the distinct influences of external forcings and internal variability can be simply and effectively distinguished.Specifically,colddry events were primarily driven by volcanic eruptions that weakened the East Asian summer monsoon and midlatitude westerlies,reducing moisture transport to the MP.In contrast,warmdry events were predominantly induced by internal variability,notably the negative phase of the Atlantic Multidecadal Oscillation and the expansion of the Barents Sea ice extent.The recent extreme compound event was probably influenced by the combined effects of anthropogenic forcings and internal variability.These findings deepen our understanding of how external forcings and internal variability affect decadal drought events on the MP and highlight that recent compound events are unprecedented in the context of the last millennium. 展开更多
关键词 decadal drought Mongolian Plateau temperature anomalies external forcings internal variability
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Assessing the Performance of CMIP6 Models in Simulating Droughts across Global Drylands 认领 引用 被引量：4
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作者 Xiaojing YU Lixia ZHANG +1 位作者 Tianjun ZHOU Jianghua ZHENG 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2024年第2期193-208,共16页
Both the attribution of historical change and future projections of droughts rely heavily on climate modeling. However,reasonable drought simulations have remained a challenge, and the related performances of the curr... Both the attribution of historical change and future projections of droughts rely heavily on climate modeling. However,reasonable drought simulations have remained a challenge, and the related performances of the current state-of-the-art Coupled Model Intercomparison Project phase 6(CMIP6) models remain unknown. Here, both the strengths and weaknesses of CMIP6 models in simulating droughts and corresponding hydrothermal conditions in drylands are assessed.While the general patterns of simulated meteorological elements in drylands resemble the observations, the annual precipitation is overestimated by ~33%(with a model spread of 2.3%–77.2%), along with an underestimation of potential evapotranspiration(PET) by ~32%(17.5%–47.2%). The water deficit condition, measured by the difference between precipitation and PET, is 50%(29.1%–71.7%) weaker than observations. The CMIP6 models show weaknesses in capturing the climate mean drought characteristics in drylands, particularly with the occurrence and duration largely underestimated in the hyperarid Afro-Asian areas. Nonetheless, the drought-associated meteorological anomalies, including reduced precipitation, warmer temperatures, higher evaporative demand, and increased water deficit conditions, are reasonably reproduced. The simulated magnitude of precipitation(water deficit) associated with dryland droughts is overestimated by 28%(24%) compared to observations. The observed increasing trends in drought fractional area,occurrence, and corresponding meteorological anomalies during 1980–2014 are reasonably reproduced. Still, the increase in drought characteristics, associated precipitation and water deficit are obviously underestimated after the late 1990s,especially for mild and moderate droughts, indicative of a weaker response of dryland drought changes to global warming in CMIP6 models. Our results suggest that it is imperative to employ bias correction approaches in drought-related studies over drylands by using CMIP6 outputs. 展开更多
关键词 droughts hydrothermal conditions drylands CMIP6 model evaluation
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CHARACTERISTICS OF RAINFALL VARIATION OVER EAST CHINA FOR THE LAST 50 YEARS AND THEIR RELATIONSHIP WITH DROUGHTS AND FLOODS 认领 引用 被引量：10
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作者 白爱娟 刘晓东 《Journal of Tropical Meteorology》 SCIE 2010年第3期255-262,共8页
With the precipitation data of 113 stations in East China during the last 50 years,the characteristics of the precipitation,including Precipitation Concentration Degree (PCD) and Precipitation Concentration Period (PC... With the precipitation data of 113 stations in East China during the last 50 years,the characteristics of the precipitation,including Precipitation Concentration Degree (PCD) and Precipitation Concentration Period (PCP) and their tendencies,are analyzed.The results show that the PCD in the northern part of the region is markedly higher than that in the southern part,but the PCP in the south is much earlier than that in the north by about one and a half months,which displays significant regional differences in precipitation.With the global warming,precipitation over East China shows an increasing tendency,but PCD displays a trend that is neither increasing nor decreasing.At the same time,the PCP is later than before,which can be mainly found in Jiangxi and southern Henan provinces.As a result,there are strong associations between the precipitation,PCD and PCP,which can be shown in the years with more precipitation,stronger PCD and later-than-usual PCP.In a word,the abnormal distribution of precipitation,PCP,and PCD over East China results in more extreme events of precipitation and more droughts and floods. 展开更多
关键词 droughts and floods precipitation concentration degree and period East China
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Effects of Droughts and Floods on Crops and Preventions in Puyang City 认领 引用
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作者 李汉浸 高翀 +1 位作者 徐文国 高志军 《Agricultural Science & Technology》 CAS 2015年第6期1264-1266,共3页
The research analyzed characters of rice/wheat growth and yield structure in Puyang and explored the effects of droughts and floods on the crops. The re-sults showed that droughts and floods had significant effects on... The research analyzed characters of rice/wheat growth and yield structure in Puyang and explored the effects of droughts and floods on the crops. The re-sults showed that droughts and floods had significant effects on crop growth and yield. In Puyang, the relieving and prevention technology of the disasters is con-cluded. Specifical y, it is recommended to make ful use of agricultural climate re-sources in a rational way and select suitable crop varieties according to climate and disaster characters, fol owed by timely sowing and scientific crop arrangement. What＇s more, ploughing should proceed in deeper soil layers and management measures should be optimized to reduce the effects of disasters on crops. In addi-tion to that, disaster index system should be reinforced in terms of establishment, monitoring, warning and prevention to lay scientific foundations and provide refer-ences for safe crop production and preventing and reducing disasters. 展开更多
关键词 Droughts and floods Rice and wheat Growth and development Dam-age influence Optimization prevention
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Combining RUSLE model and the vegetation health index to unravel the relationship between soil erosion and droughts in southeastern Tunisia 认领 引用 被引量：3
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作者 Olfa TERWAYET BAYOULI ZHANG Wanchang Houssem TERWAYET BAYOULI 《Journal of Arid Land》 SCIE CSCD 2023年第11期1269-1289,共21页
Droughts and soil erosion are among the most prominent climatic driven hazards in drylands,leading to detrimental environmental impacts,such as degraded lands,deteriorated ecosystem services and biodiversity,and incre... Droughts and soil erosion are among the most prominent climatic driven hazards in drylands,leading to detrimental environmental impacts,such as degraded lands,deteriorated ecosystem services and biodiversity,and increased greenhouse gas emissions.In response to the current lack of studies combining drought conditions and soil erosion processes,in this study,we developed a comprehensive Geographic Information System(GIS)-based approach to assess soil erosion and droughts,thereby revealing the relationship between soil erosion and droughts under an arid climate.The vegetation condition index(VCI)and temperature condition index(TCI)derived respectively from the enhanced vegetation index(EVI)MOD13A2 and land surface temperature(LST)MOD11A2 products were combined to generate the vegetation health index(VHI).The VHI has been conceived as an efficient tool to monitor droughts in the Negueb watershed,southeastern Tunisia.The revised universal soil loss equation(RUSLE)model was applied to quantitatively estimate soil erosion.The relationship between soil erosion and droughts was investigated through Pearson correlation.Results exhibited that the Negueb watershed experienced recurrent mild to extreme drought during 2000–2016.The average soil erosion rate was determined to be 1.8 t/(hm2•a).The mountainous western part of the watershed was the most vulnerable not only to soil erosion but also to droughts.The slope length and steepness factor was shown to be the most significant controlling parameter driving soil erosion.The relationship between droughts and soil erosion had a positive correlation(r=0.3);however,the correlation was highly varied spatially across the watershed.Drought was linked to soil erosion in the Negueb watershed.The current study provides insight for natural disaster risk assessment,land managers,and stake-holders to apply appropriate management measures to promote sustainable development goals in fragile environments. 展开更多
关键词 droughts soil erosion vegetation health index(VHI) revised universal soil loss equation(RUSLE)model southeastern Tunisia
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Droughts in Homogeneous Areas of South America and Associated Processes during the Months of Austral Spring and Summer 认领 引用 被引量：1
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作者 Mariah Sousa GOMES Iracema Fonseca de Albuquerque CAVALCANTI Gabriela V.MULLER 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2024年第12期2337-2353,共17页
Droughts that occurred in selected areas located in homogeneous regions of South America during the austral springs(SON)and summers(DJF)from 1982 to 2019 are identified using the Standard Precipitation Index(SPI).Four... Droughts that occurred in selected areas located in homogeneous regions of South America during the austral springs(SON)and summers(DJF)from 1982 to 2019 are identified using the Standard Precipitation Index(SPI).Four areas were analyzed for droughts in SON,and three areas were analyzed for droughts in DJF.The areas in the Amazon suffered from the majority of their droughts during El Niño years,while most of the droughts in the areas of southern Brazil,Uruguay,and North Argentina occurred during La Niña years.In southeastern and central-western parts of Brazil,droughts occurred during both phases of El Nino-Southern Oscillation(ENSO)and also during neutral years.Thus,other processes besides ENSO are likely related to the observed droughts.The droughts were investigated for each area and month,and composites of atmospheric and oceanic variables during both seasons were analyzed for the selected cases.Regional and large-scale field composites were examined to identify the main processes associated with dry conditions in the different areas.Regional features were related to the influence of high pressure over southern and southeastern areas and the divergence of moisture flux in all areas.Meridional circulations contributed to subsidence over the dry regions.The large-scale influential features include SST anomalies,wavetrains over the South Pacific Ocean with centers of action over South America that produced subsidence in the study areas,and convection anomalies in the Maritime continent and surrounding areas.Therefore,the droughts were associated with a combination of regional and large-scale features that produced subsidence over the analyzed regions. 展开更多
关键词 droughts South America regional features large-scale features
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Combined Impacts of Antecedent Earthquakes and Droughts on Disastrous Debris Flows 认领 引用 被引量：18
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作者 CHEN Ning-sheng LU Yang +2 位作者 ZHOU Hai-bo DENG Ming-feng Han Da-wei 《Journal of Mountain Science》 SCIE CSCD 2014年第6期1507-1520,1-6,共14页
This paper describes a study on the combined impacts of antecedent earthquakes and droughts on disastrous debris flows.This is a novel attempt in quantifying such impacts using the effective peak acceleration(EPA)(to ... This paper describes a study on the combined impacts of antecedent earthquakes and droughts on disastrous debris flows.This is a novel attempt in quantifying such impacts using the effective peak acceleration(EPA)(to represent earthquakes) and standardized precipitation index(SPI)(to represent droughts).The study is based on the analysis of 116 disastrous debris flow events occurred in China's Mainland in the last 100 years covering a wide spectrum of climate types and landforms.It has been found that the combined impacts from earthquakes and droughts on disastrous debris flows do exist and vary from low to very high according to different climate conditions and terrains.The impacts from earthquakes increase with the increased terrain relief,and the impacts from droughts are strongest in semi-humid climate condition(with reduced impacts in humid and semi-arid /arid climate conditions).Hypothetical explanations on the study discoveries have been proposed.This study reveals the possible reasons for the disastrous debris flow distributions around the world and has significant implications in paleo-climate-seismicanalysis and disastrous debris flow risk management. 展开更多
关键词 Debris flow Erosion Earthquake Drought Natural hazard
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Resilience and response:Unveiling the impacts of extreme droughts on forests through integrated dendrochronological and remote sensing analyses 认领 引用 被引量：7
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作者 Han Shi Xi Peng +6 位作者 Yong-Jiao Zhou Ai-Ying Wang Xue-Kai Sun Na Li Quan-Sheng Bao Gude Buri Guang-You Hao 《Forest Ecosystems》 SCIE CSCD 2024年第4期491-501,共11页
Extreme droughts are anticipated to have detrimental impacts on forest ecosystems,especially in water-limited regions,due to the influence of climate change.However,considerable uncertainty remains regarding the patte... Extreme droughts are anticipated to have detrimental impacts on forest ecosystems,especially in water-limited regions,due to the influence of climate change.However,considerable uncertainty remains regarding the patterns in species-specific responses to extreme droughts.Here,we conducted a study integrating dendrochronology and remote sensing methods to investigate the mosaic-distributed maple-oak(native)natural forests and poplar plantations(introduced)in the Horqin Sandy Land,Northeast China.We assessed the impacts of extreme droughts on tree performances by measuring interannual variations in radial growth and vegetation index.The results showed that precipitation and self-calibrated palmer drought severity index(scPDSI)are the major factors influencing tree-ring width index(RWI)and normalized difference vegetation index(NDVI).The severe droughts between 2000 and 2004 resulted in reduced RWI in the three studied tree species as well as led to NDVI reductions in both the maple-oak natural forests and the poplar plantations.The RWI reached the nadir during the2000-2004 severe droughts and remained at low levels two years after the severe drought,creating a legacy effect.In contrast to the lack of significant correlation between RWI and scPDSI,NDVI exhibited a significant positive correlation with scPDSI indicating the greater sensitivity of canopy performance to droughts than radial growth.Furthermore,interspecific differences in RWI and NDVI responses were observed,with the fast-growing poplar species experiencing a more significant RWI decrease and more negative NDVI anomaly during severe droughts than native species,highlighting the species-specific trade-offs between drought resilience and growth rate.This study emphasizes the importance of combining tree-level radial growth with landscape-scale canopy remote sensing to understand forest resilience and response.Our study improves our understanding of forest responses to extreme drought and highlights species differences in climate responses,offering crucial insights for optimizing species selection in sustainable afforestation and forest management in water-limited regions under the influence of climate change. 展开更多
关键词 Introduced tree species Native tree species NDVI Severe drought Tree-ring width
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Mechanism and Forecasting Methods for Severe Droughts and Floods in Songhua River Basin in China 认领 引用 被引量：6
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作者 LI Hongyan WANG Yuxin LI Xiubin 《Chinese Geographical Science》 SCIE CSCD 2011年第5期531-542,共12页
The influence of various factors, mechanisms, and principles affecting runoff are summarized as periodic law, random law, and basin-wide law. Periodic law is restricted by astronomical factors, random law is restricte... The influence of various factors, mechanisms, and principles affecting runoff are summarized as periodic law, random law, and basin-wide law. Periodic law is restricted by astronomical factors, random law is restricted by atmospheric circulation, and basin-wide law is restricted by underlying surface. The commensurability method was used to identify the almost period law, the wave method was applied to deducing the random law, and the precursor method was applied in order to forecast runoff magnitude for the current year. These three methods can be used to assess each other and to forecast runoff. The system can also be applied to forecasting wet years, normal years and dry years for a particular year as well as forecasting years when floods with similar characteristics of previous floods, can be expected. Based on hydrological climate data of Baishan (1933-2009) and Nierji (1886-2009) in the Songhua River Basin, the forecasting results for 2010 show that it was a wet year in the Baishan Reservoir, similar to the year of 1995; it was a secondary dry year in the Nierji Reservoir, similar to the year of 1980. The actual water inflow into the Baishan Reservoir was 1.178 × 10 10 m 3 in 2010, which was markedly higher than average inflows, ranking as the second highest in history since records began. The actual water inflow at the Nierji station in 2010 was 9.96 × 10 9 m 3 , which was lower than the average over a period of many years. These results indicate a preliminary conclusion that the methods proposed in this paper have been proved to be reasonable and reliable, which will encourage the application of the chief reporter release system for each basin. This system was also used to forecast inflows for 2011, indicating a secondary wet year for the Baishan Reservoir in 2011, similar to that experienced in 1991. A secondary wet year was also forecast for the Nierji station in 2011, similar to that experienced during 1983. According to the nature of influencing factors, mechanisms and forecasting methods and the service objects, mid-to long-term hydrological forecasting can be divided into two classes:mid-to long-term runoff forecasting, and severe floods and droughts forecasting. The former can be applied to quantitative forecasting of runoff, which has important applications for water release schedules. The latter, i.e., qualitative disaster forecasting, is important for flood control and drought relief. Practical methods for forecasting severe droughts and floods are discussed in this paper. 展开更多
关键词 Songhua River Basin runoff drought and flood forecasting
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Detecting Agro-Droughts in Southwest of China Using MODIS Satellite Data 认领 引用 被引量：5
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作者 ZHANG Feng ZHANG Li-wen +1 位作者 WANG Xiu-zhen HUNG Jing-feng 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2013年第1期159-168,共10页
The normalized difference vegetation index （NDVI） has proven to be typically employed to assess terrestrial vegetation conditions. However, one limitation of NDVI for drought monitoring is the apparent time lag betw... The normalized difference vegetation index （NDVI） has proven to be typically employed to assess terrestrial vegetation conditions. However, one limitation of NDVI for drought monitoring is the apparent time lag between rainfall deficit and NDVI response. To better understand this relationship, time series NDVI （2000-2010） during the growing season in Sichuan Province and Chongqing City were analyzed. The vegetation condition index （VCI） was used to construct a new drought index, time-integrated vegetation condition index （TIVCI）, and was then compared with meteorological drought indices-standardized precipitation index （SPI）, a multiple-time scale meteorological-drought index based on precipitation, to examine the sensitivity on droughts. Our research findings indicate the followings： （1） farmland NDVI sensitivity to precipitation in study area has a time lag of 16-24 d, and it maximally responds to the temperature with a lag of about 16 d. （2） We applied the approach to Sichuan Province and Chongqing City for extreme drought monitoring in 2006 and 2003, and the results show that the monitoring results from TIVCI are closer to the published China agricultural statistical data than VCI. Compared to VCI, the best results from TIVCI3 were found with the relative errors of -4.5 and 6.36% in 2006 for drought affected area and drought disaster area respectively, and 5.11 and -5.95% in 2003. （3） Compared to VCI, TIVCI has better correlation with the SPI, which indicates the lag and cumulative effects of precipitation on vegetation. Our finding proved that TIVCI is an effective indicator of drought detection when the time lag effects between NDVI and climate factors are taken into consideration. 展开更多
关键词 time-integrated vegetation condition index （TIVCI） time lag normalized difference vegetation index （NDVI） drought monitor standardized precipitation index （SPI）
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SPATIAL DISTRIBUTION AND VARIATION TENDENCY OF DROUGHTS AND FLOODS IN HUNAN PROVINCE DURING THE PAST 36 YEARS 认领 引用 被引量：3
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作者 张剑明 章新平 +4 位作者 黎祖贤 张健 肖艳 刘燚 周伟 《Journal of Tropical Meteorology》 SCIE 2011年第4期385-391,共7页
Using the 1970-2005 annual precipitation and evaporation data at 80 gauge stations across Hunan province,this work analyzes the spatial distribution and variation tendency of the local droughts and floods using linear... Using the 1970-2005 annual precipitation and evaporation data at 80 gauge stations across Hunan province,this work analyzes the spatial distribution and variation tendency of the local droughts and floods using linear regression,wavelet analysis,abrupt change,clusters,Empirical Orthogonal Function (EOF) and rotated EOF (REOF).Results show that there are four dry areas and three wet areas in Hunan.The whole province exhibits a moistening trend except some small areas in western,eastern and southern Hunan.The most prominent feature of annual precipitation is that the whole province basically displays a consistent variation tendency,as far as the dominant EOF mode is concerned.In addition,the spatial features of the other EOF modes include dry-wet differences,e.g.wet (or dry) in the north versus dry (or wet) in the south,wet (or dry) in the center and dry (or wet) in the surrounding areas.The distribution of the ratios of evaporation to precipitation exhibits both common features as well as spatial differences,which can be classified into four types:South Hunan,North Hunan,Northeast Hunan,and Central Hunan.There is an abrupt change from dry to wet patterns in the early 1990s.Generally,the drought-flood distribution presents variations of three periods.In the late 2000s,Hunan province will be in a period of drought,followed by a period of flood. 展开更多
关键词 spatiotemporal characteristics REOF Morlet analysis Hunan province drought and flood
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Spatiotemporal pattern of the dynamics in area,production,and yield of Aus rice in Bangladesh and its response to droughts from 1980 to 2018 认领 引用
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作者 KHONDAKAR Arifuzzaman DONG Jinwei +7 位作者 LI Zhichao DENG Xiangzheng SINGHA Mrinal RAHMAN Md.Mizanur JIN Zhenong WANG Shaoqiang ZHEN Lin XIAO Xiangming 《Journal of Geographical Sciences》 SCIE CSCD 2022年第10期2069-2084,共16页
Bangladesh is one of the most vulnerable countries to natural disasters such as droughts in the world.The pre-monsoon Aus rice in Bangladesh depends on rainfall and is threatened by increasing droughts.However,limited... Bangladesh is one of the most vulnerable countries to natural disasters such as droughts in the world.The pre-monsoon Aus rice in Bangladesh depends on rainfall and is threatened by increasing droughts.However,limited information on the changes in Aus rice as well as droughts hamper our understanding of the country’s agricultural resilience and adaption to droughts.Here,we collected all the official statistical data of Aus rice at the district level from 1980 to 2018,and examined the interannual variations of area,yield,and production.The results showed both area and production of Aus rice decreased significantly(61.58×103 ha yr-1 and 17.21×103 M.tons yr-1,respectively),while yield increased significantly(0.03 M.tons ha-1 yr-1).We also found a significantly increasing trend of droughts in 88%of area based on the Palmer Drought Severity Index(PDSI)data,especially in those rainfed agricultural areas.Moreover,we found significant positive correlations between PDSI and Aus rice area(production)in 33(25)out of 64 districts.There is hardly a relationship between PDSI and yield,likely due to the improved management and increasing irrigated areas.Implementing continuous drought monitoring,combined irrigation(surface and groundwater)systems,and conservation and precision agriculture are highly recommended in these drought-prone districts to ensure food security in Bangladesh. 展开更多
关键词 Aus rice droughts acreage production yield PDSI Bangladesh
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Climate Change: Droughts and Increasing Desertification in the Middle East, with Special Reference to Iraq 认领 引用 被引量：3
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作者 Nasrat Adamo Nadhir Al-Ansari +2 位作者 Varoujan Sissakian Khalid Jehad Fahmi Salwan Ali Abed 《Engineering（科研）》 2022年第7期235-273,共39页
Climate change impacts on Earth’s atmosphere have caused drastic changes in the environment of most regions of the world. The Middle East region ranks among the worst affected of these regions. This has taken forms o... Climate change impacts on Earth’s atmosphere have caused drastic changes in the environment of most regions of the world. The Middle East region ranks among the worst affected of these regions. This has taken forms of increasing atmospheric temperatures, intensive heat waves, decreased and erratic precipitation and general decline in water resources;all leading to frequent and longer droughts, desertification and giving rise to intensive and recurrent (SDS). The present conditions have led to increasing emissions of (GHG) in the earth atmosphere. All future projections especially those using (IPCC) models and emission scenarios indicate that the Middle East will undergo appreciable decrease in winter precipitation with increasing temperature until the end of this century both of which are inductive to increased dryness and desertification. Iraq as one of the countries of this region and due to its geographical location, its dependence mostly on surface water resources originating from neighboring countries, long years of neglect and bad land management put it in the most precarious and unstable position among the other countries of the region. Modelling studies have shown that Iraq is suffering now from excessive dryness and droughts, increasing loss of vegetation cover areas, increasing encroachment of sand dunes on agricultural lands, in addition to severe and frequent (SDS). These negative repercussions and their mitigations require solutions not on the local level alone but collective cooperation and work from all the countries of the region. 展开更多
关键词 Climate Change East Mediterranean Region Aridity Indices Droughts Desertification Sand and Dust Storms (SDS) Green House Gases (GHG) Intergovermental Panel for Climate Change (IPCC)
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Detecting Droughts in Southwest China from GPS Vertical Position Displacements 认领 引用 被引量：10
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作者 Chaolong YAO Zhicai LUO +3 位作者 Yueming HU Changwei WANG Rui ZHANG Jinming LI 《Journal of Geodesy and Geoinformation Science》 2020年第3期50-58,共9页
The solid Earth responds elastically to terrestrial water storage(TWS)changes.Here global positioning system(GPS)vertical position data at 31 stations from the crustal movement observation network of China(CMONOC)from... The solid Earth responds elastically to terrestrial water storage(TWS)changes.Here global positioning system(GPS)vertical position data at 31 stations from the crustal movement observation network of China(CMONOC)from August 2010 to December 2016 are used to detect droughts in Southwest China.Monthly GPS vertical position displacements respond negatively to precipitation changes and TWS changes observed by gravity recovery and climate experiments(GRACE)as well as river water level variations.GPS vertical position anomalies(the non-seasonal term)are well correlated negatively(correlations of about-0.70)with the commonly used meteorological composite index(CI)in China and the GRACE drought severity index(GRACE-DSI),but less correlated with the standardized precipitation evapotranspiration index(SPEI).Compared to CI,GPS vertical position anomalies have the advantage of detecting droughts caused by abrupt precipitation deficits in a short time.GRACE-DSI is less accurate in drought monitoring for some periods due to the missing data,while the severity of abrupt precipitation absent in some cases can be overestimated from SPEI with big variability.This study shows the reliability and advantages of GPS data in drought monitoring. 展开更多
关键词 GPS vertical displacement terrestrial water storage GRACE drought
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