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Source,bioaccessibility and oral exposure risk assessment of rare earth elements in soils with typical land-use types 认领 引用
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作者 Liwen Zhang Xiaoli Duan +4 位作者 Ran Li Wenyu Wu Fei Gao Hongguang Cheng Beibei Wang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第3期464-474,共11页
The rare earth elements(REEs)are strategic elements extensively utilized.Accurate exposure risk assessment is crucial for managing potential health hazard associated with soil REEs.However,existing exposure assessment... The rare earth elements(REEs)are strategic elements extensively utilized.Accurate exposure risk assessment is crucial for managing potential health hazard associated with soil REEs.However,existing exposure assessments inadequately consider the effects of bioaccessibility and land-use type on risk levels.This study collected soil samples from areas with distinct land-use types to measure REEs concentration and bioaccessibility,and then assessed non-carcinogenic and carcinogenic exposure risk based on bioaccessibility using Monte Carlo simulation.The results indicated that total REEs concentrations ranges from 71.2 to 220.2 mg/kg,and the highest value was found in petroleum refinery soil.The bioaccessibility of REEs ranges from 0.3%to 1.9%,and the highest value was found in light industry area soil.Distribution patterns of REEs suggest that primary sources of soil REEs are parent materials of soil in this study such as granite and Alkaline basalt,and anthropogenic activities such as emission of petroleum refining,fertilizers and atmosphere particle depositions,both of which are associated to land-use type.Exposure risk assessments indicate that non-carcinogenic and carcinogenic exposure risk is acceptable for children and adults.Among the soils,urban park soil has the highest exposure risk,whereas Tibet plateau soil in residential area has the lowest.The bioaccessibility and concentration of REEs in soil are primary factors influencing risk,followed by exposure time.This study indicates that the exposure risk of soil REEs is associated with bioaccessibility and land-use type,aiding in the prediction and management of potential health risks associated with soil REEs. 展开更多
关键词 Rare earth element Oral exposure Bioaccessibility Land-use type
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Responses of viral communities and viral-encoded auxiliary metabolic genes to long-term fertilization practices under different land-use types 认领 引用
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作者 Xunqi Chen Dong Zhu +4 位作者 Yuling Zheng Xiaomin Li Guoxin Sun Xiaoming Li Longjun Ding 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第4期296-306,共11页
Viruses are key regulators of the soil microbial community.Lysogenic phages can benefit their microbial hosts by integrating auxiliary metabolic genes(AMGs)into host genomes.Long-term fertilization can affect soil mic... Viruses are key regulators of the soil microbial community.Lysogenic phages can benefit their microbial hosts by integrating auxiliary metabolic genes(AMGs)into host genomes.Long-term fertilization can affect soil microbial diversity;however,there is limited knowledge about how viral communities and viral-encoded AMGs respond to long-term fertilization under different land-use types.In this study,the profiles of viral communities and viral-encoded AMGs in adjacent paddy and upland soils receiving different long-term fertilization treatments(no fertilization,chemical/organic fertilization alone,and chemical combined with organic fertilization)were characterized using metavirome sequencing.The diversity and structure of viral communities in paddy soils were less responsive to different fertilization practices than those in upland soils.Moreover,the viral community profiles in the paddy and upland soils were primarily determined by the soil properties(NH4+-N and total manganese,respectively)rather than by the microbial community.Additionally,long-term fertilization,particularly organic fertilization,substantially enriched viral-encoded carbon cycle–related AMGs;however,the processes in which they participated were distinct between the paddy(energy metabolism and biosynthesis)and upland soils(complex carbohydrate decomposition and cell wall synthesis).Given that upland soils had lower nutrient levels and a higher proportion of lysogenic phages than the paddy soils,the upland soil phages were more inclined to adopt“piggyback-the-winner”strategy to make the viruses and hosts mutually beneficial.Collectively,these findings provide novel insights into how viral-encoded AMGs affect hosts,further influencing the soil nutrient cycles under long-term fertilization across different land-use types. 展开更多
关键词 Soil virus Auxiliary metabolic genes Long-term fertilization Nutrient cycle Land-use type
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Taxon-specific microbial responses to land-use and landscape heterogeneity are modulated by soil nutrient availability 认领 引用
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作者 Hanghang Zhang Zhi Wen +2 位作者 Zhiyong Wang Ruonan Li Hua Zheng 《Ecological Frontiers》 CSCD 2026年第1期254-262,共9页
Land-use change and associated landscape pattern modifications are key drivers of biodiversity dynamics.However,the influence of landscape heterogeneity on soil microbial diversity remains poorly understood.This study... Land-use change and associated landscape pattern modifications are key drivers of biodiversity dynamics.However,the influence of landscape heterogeneity on soil microbial diversity remains poorly understood.This study analyzed soil microbial communities(bacteria and fungi)and soil properties(organic carbon,pH,available potassium,nitrogen,and phosphorus)across 74 sites in Hainan,China,covering six land-use types(rubber,areca,banana,farmland,longan,and mango).We evaluated the effects of both landscape composition(habitat coverage and patch richness)and configuration heterogeneity(patch density and largest patch index)on soil microbial community structure and diversity.Results show that land-use types and landscape patterns weakly affect microbial composition but strongly shape diversity in a taxon-specific way.Bacterial Chao1 richness and fungal Shannon diversity varied significantly among land-use types,mainly due to soil available phosphorus.Rubber coverage positively correlated with bacterial and fungal diversity,while the largest patch index negatively affected only fungal diversity.Available phosphorus reduced this negative effect.This study demonstrates that land-use change and landscape heterogeneity differentially influence soil microbial composition and diversity,with available phosphorus emerging as a key determinant.Our findings highlight the need for careful landscape planning and soil nutrient management to preserve soil microbial diversity. 展开更多
关键词 Land-use change Landscape pattern Soil microbial diversity Available phosphorus
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Assessment of Chinese urban land-use efficiency(SDG11.3.1)utilizing high-precision urban built-up area data 认领 引用
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作者 Hao Wang Yafei Liu +2 位作者 Lianze Sun Xiaogang Ning Guangzhe Li 《Geography and Sustainability》 CSCD 2025年第1期58-74,共17页
Assessment of SDG11.3.1 indicator of the United Nations Sustainable Development Goals(SDGs)is a valuable tool for policymakers in urban planning.This study aims to enhance the accuracy of the SDG11.3.1 evaluation and ... Assessment of SDG11.3.1 indicator of the United Nations Sustainable Development Goals(SDGs)is a valuable tool for policymakers in urban planning.This study aims to enhance the accuracy of the SDG11.3.1 evaluation and explore the impact of varying precision levels in urban built-up area on the indicator’s assessment outcomes.We developed an algorithm to generate accurate urban built-up area data products based on China’s Geographical Condition Monitoring data with a 2 m resolution.The study evaluates urban land-use efficiency in China from 2015 to 2020 across different geographical units using both the research product and data derived from other studies utilizing medium and low-resolution imagery.The results indicate:(1)A significant improvement in the accuracy of our urban built-up area data,with the SDG11.3.1 evaluation results demonstrating a more precise reflection of spatiotemporal characteristics.The indicator shows a positive correlation with the accuracy level of the built-up area data;(2)From 2015 to 2020,Chinese prefecture-level cities have undergone faster urbanization in terms of land expansion relative to population growth,leading to less optimal land resource utilization.Only in extra-large cities does urban population growth show a relatively balanced pattern.However,urban popula tion growth in other regions and cities of various sizes lags behind land urbanization.Notably,Northeast China and small to medium cities encounter significant challenges in urban population growth.The comprehensive framework developed for evaluating SDG11.3.1 with high-precision urban built-up area data can be adapted to different national regions,yielding more accurate SDG11.3.1 outcomes.Our urban area and built-up area data products provide crucial inputs for calculating at least four indicators related to SDG11. 展开更多
关键词 SDG11.3.1 Land-use efficiency Urban built-up area Urbanization Population growth
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A Setup for a Scenario-Driven Water Balance at Landscape Scale—Assessment with AKWA-M~-Embedded in a Model Framework for Land-Use Planning’s Decision Support in Mountainous Southwest China 认领 引用 被引量：1
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作者 Andreas Wahren Karin Berkhoff +2 位作者 Albrecht Münch Sylvia Herrmann Karl-Heinz Feger 《Journal of Earth Science》 SCIE CAS 2010年第6期974-978,共5页
Land-cover changes cause a loss of natural vegetation in many parts of the world. In the Xishuangbanna （西双版纳） district （Yunnan （云南） Province）, rubber plantations replace tropical rainforests covering alrea... Land-cover changes cause a loss of natural vegetation in many parts of the world. In the Xishuangbanna （西双版纳） district （Yunnan （云南） Province）, rubber plantations replace tropical rainforests covering already an area of about 10% of the study area （2007）. There, land-use allocation is mostly driven by economic considerations. Thus, local planning authorities need decision support for land-use planning issues, which integrate socio-economic and ecological aspects. Within the NabanFrame, an agro-economic, ecological and social model was applied, which, altogether, interacted with a land allocation model via defined interfaces. Effects on the water cycle, ecological conditions as well as socio-economic should be considered by integrating the spatially distributed rainfali-runoff and water balance model AKWA-M in the model setup. 展开更多
关键词 land-use water balance model rubber integrated land-use planning land-use prognosis.
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A Hybrid Inexact Optimization Model for Land-use Allocation of China 认领 引用 被引量：9
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作者 ZHOU Min CAI Yunlong +2 位作者 GUAN Xingliang TAN Shukui LU Shasha 《Chinese Geographical Science》 SCIE CSCD 2015年第1期62-73,共12页
Land scarcity has become the prominent obstacle on the way to sustainable development for China. Under the constraints of land shortage, how to allocate the finite land resources to the multiple land users in China co... Land scarcity has become the prominent obstacle on the way to sustainable development for China. Under the constraints of land shortage, how to allocate the finite land resources to the multiple land users in China considering various political, environmental, ecological and economic conditions have become research topics with great significance. In this study, an interval fuzzy national-scale land-use model(IFNLM) was developed for optimizing land systems of China. IFNLM is based on an integration of existing interval linear programming(ILP), and fuzzy flexible programming(FFP) techniques. IFNLM allows uncertainties expressed as discrete interval values and fuzzy sets to be incorporated within a general optimization framework. It can also facilitate national-scale land-use planning under various environmental, ecological, social conditions within a multi-period and multi-option context. Then, IFNLM was applied to a real case study of land-use planning in China. The satisfaction degree of environmental constraints is between 0.69 and 0.97, the system benefit will between 198.25 × 1012 USD and 229.67 × 1012 USD. The results indicated that the hybrid model can help generate desired policies for land-use allocation with a maximized economic benefit and minimized environmental violation risk. Optimized land-use allocation patterns can be generated from the proposed IFNLM. 展开更多
关键词 land-use planning uncertain model interval linear programming（ILP） fuzzy flexible programming（FFP） environmental protection interval fuzzy national-scale land-use model（IFNLM）
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Driving forces behind the spatiotemporal heterogeneity of land-use and land-cover change:A case study of the Weihe River Basin,China 认领 引用 被引量：8
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作者 WU Jingyan LUO Jungang +1 位作者 ZHANG Han YU Mengjie 《Journal of Arid Land》 SCIE CSCD 2023年第3期253-273,共21页
The impact of socioeconomic development on land-use and land-cover change(LUCC)in river basins varies spatially and temporally.Exploring the spatiotemporal evolutionary trends and drivers of LUCC under regional dispar... The impact of socioeconomic development on land-use and land-cover change(LUCC)in river basins varies spatially and temporally.Exploring the spatiotemporal evolutionary trends and drivers of LUCC under regional disparities is the basis for the sustainable development and management of basins.In this study,the Weihe River Basin(WRB)in China was selected as a typical basin,and the WRB was divided into the upstream of the Weihe River Basin(UWRB),the midstream of the Weihe River Basin(MWRB),the downstream of the Weihe River Basin(DWRB),the Jinghe River Basin(JRB),and the Luohe River Basin(LRB).Based on land-use data(cultivated land,forestland,grassland,built-up land,bare land,and water body)from 1985 to 2020,we analyzed the spatiotemporal heterogeneity of LUCC in the WRB using a land-use transfer matrix and a dynamic change model.The driving forces of LUCC in the WRB in different periods were detected using the GeoDetector,and the selected influencing factors included meteorological factors(precipitation and temperature),natural factors(elevation,slope,soil,and distance to rivers),social factors(distance to national highway,distance to railway,distance to provincial highway,and distance to expressway),and human activity factors(population density and gross domestic product(GDP)).The results indicated that the types and intensities of LUCC conversions showed considerable disparities across different sub-basins,where complex conversions among cultivated land,forestland,and grassland occurred in the LRB,JRB,and UWRB,with higher dynamic change before 2000.The conversion of other land-use types to built-up land was concentrated in the UWRB,MWRB,and DWRB,with substantial increases after 2000.Additionally,the driving effects of the influencing factors on LUCC in each sub-basin also exhibited distinct diversity,with the LRB and JRB being influenced by the meteorological and social factors,and the UWRB,MWRB,and DWRB being driven by human activity factors.Moreover,the interaction of these influencing factors indicated an enhanced effect on LUCC.This study confirmed the spatiotemporal heterogeneity effects of socioeconomic status on LUCC in the WRB under regional differences,contributing to the sustainable development of the whole basin by managing sub-basins according to local conditions. 展开更多
关键词 land-use and land-cover change(LUCC) spatial heterogeneity land-use conversion dynamic change model GeoDetector human activities Weihe River Basin
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Land-use planning in China:Past,present,and future 认领 引用 被引量：1
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作者 CHEN Wanxu PAN Sipei YE Xinyue 《Journal of Geographical Sciences》 SCIE CSCD 2023年第7期1527-1552,共26页
Under the framework of ecological civilisation,the formulation of territorial spatial planning(TSP) and improvement of spatial governance systems are of great practical significance.Since the founding of the People’s... Under the framework of ecological civilisation,the formulation of territorial spatial planning(TSP) and improvement of spatial governance systems are of great practical significance.Since the founding of the People’s Republic of China,land-use planning(LUP) has experienced profound changes,and tremendous research efforts have been made in that field.However,systematic studies on LUP history are scarce.To bridge the existing gap,this study traced back to the emergence of LUP,described its practice stages,and analysed the evolution of its classification system and methods.Further,the three rounds of general LUP practice and the current TSP over the past 40 years of the reform and opening-up have been discussed.The evolution of LUP was found to be closely related to economic development and could be broadly divided into four stages.The development of land-use classification in China has been slow and can be divided into five stages according to the evolution of the land classification system and important historical events.The development of LUP methods can be divided into two stages,before and after 1978.Since the economic reform,China has successively conducted three rounds of general LUP under different institutional and policy backgrounds.Future development should aim to innovate the theories and methods of TSP with Chinese characteristics and promote the study of village planning and the construction of TSP systems to achieve rural revitalisation and ecological civilisation. 展开更多
关键词 land-use planning land-use policy territorial spatial planning sustainable development China
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Legal issues of investment with the land-use right raThe practical guidance to business 认领 引用
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作者 高富平 《US-China Law Review》 2009年第5期1-9,共9页
The investment with land-use right is regulated by company law as well as property law. There are various kinds of land-use right in China, which puzzles businessmen or practitioner so much. This paper identifies all ... The investment with land-use right is regulated by company law as well as property law. There are various kinds of land-use right in China, which puzzles businessmen or practitioner so much. This paper identifies all kinds of land-use right that are available for invest in business legally, and then analyze the procedure requirement for investment in business. Based on former discussions, numbers of special legal issues are discussed further, e.g. investment with land-use right in the enterprises invested by foreigners; investment with land-use right granted by government; investment with land-use right in countryside. With these discussions, the author tries to provide a clear practical guidance to businesses. 展开更多
关键词 investment with right of land-use right of land-use for construction company law property law
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Stability of Land-use/Land-cover in National Nature Reserves of Jilin Province, China 认领 引用 被引量：3
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作者 SHANG Yi WANG Dongyan +1 位作者 LIU Shuhan LI Hong 《Chinese Geographical Science》 SCIE CSCD 2022年第2期324-339,共16页
National nature reserves are an important part of classification management on ecological protection in China. Taking the national nature reserves of Jilin Province as examples, this paper introduced the stability ind... National nature reserves are an important part of classification management on ecological protection in China. Taking the national nature reserves of Jilin Province as examples, this paper introduced the stability index by referring to the intensity model of landuse and land-cover change(LUCC), and analyzed the overall stability of land-use and land-cover(LULC) in the study area from the time interval level and land category level. The stability of LULC in different types of nature reserves was tracked and identified by extracting land-use change trajectory, and the land-use change trajectory was divided into three types: stable type, sub-stable type and unstable type. The impact of LUCC on regional ecosystem services was studied by using hotspot analysis and gravity center analysis. The results showed that: 1) The LULC in the study area was stable on the whole, and the proportion of stable land area reached 86.08%. The intensity of LUCC showed an increasing trend in recent 20 years, and the conversion of cultivated land and construction land was active in continuous time interval. 2) The stability of LULC in forest ecological reserves and wildlife reserves in the eastern part of Jilin Province was the highest, while that in inland wetland reserves and geological relic reserves in the central and western part of Jilin Province was lower.3) The LUCC in national nature reserves not only changed the value of its own ecosystem service function, but also affected the ecosystem service function of the whole region. The combination of intensity analysis and land-use change trajectory was used to identify the characteristics of stability of LULC in nature reserves, which was conducive to deeply understand the process of LUCC in national nature reserves and provided reasonable suggestions for regional ecological protection. 展开更多
关键词 national nature reserves land-use and land-cover change(LUCC) stability intensity analysis land-use change trajectory ecosystem service value
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Spatiotemporal patterns and characteristics of land-use change in China during 2010–2015 认领 引用 被引量：94
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作者 宁佳 刘纪远 +10 位作者 匡文慧 徐新良 张树文 颜长珍 李仁东 吴世新 胡云锋 杜国明 迟文峰 潘涛 宁静 《Journal of Geographical Sciences》 SCIE CSCD 2018年第5期547-562,共16页
Land use/cover change is an important theme on the impacts of human activities on the earth systems and global environmental change. National land-use changes of China during 2010–2015 were acquired by the digital in... Land use/cover change is an important theme on the impacts of human activities on the earth systems and global environmental change. National land-use changes of China during 2010–2015 were acquired by the digital interpretation method using the high-resolution remotely sensed images, e.g. the Landsat 8 OLI, GF-2 remote sensing images. The spatiotemporal characteristics of land-use changes across China during 2010–2015 were revealed by the indexes of dynamic degree model, annual land-use changes ratio etc. The results indicated that the built-up land increased by 24.6×10~3 km^2 while the cropland decreased by 4.9×10~3 km^2, and the total area of woodland and grassland decreased by 16.4×10~3 km^2. The spatial pattern of land-use changes in China during 2010–2015 was concordant with that of the period 2000–2010. Specially, new characteristics of land-use changes emerged in different regions of China in 2010–2015. The built-up land in eastern China expanded continually, and the total area of cropland decreased, both at decreasing rates. The rates of built-up land expansion and cropland shrinkage were accelerated in central China. The rates of built-up land expansion and cropland growth increased in western China, while the decreasing rate of woodland and grassland accelerated. In northeastern China, built-up land expansion slowed continually, and cropland area increased slightly accompanied by the conversions between paddy land and dry land. Besides, woodland and grassland area decreased in northeastern China. The characteristics of land-use changes in eastern China were essentially consistent with the spatial govern and control requirements of the optimal development zones and key development zones according to the Major Function-oriented Zones Planning implemented during the 12 th Five-Year Plan(2011–2015). It was a serious challenge for the central government of China to effectively protect the reasonable layout of land use types dominated with the key ecological function zones and agricultural production zones in centraland western China. Furthermore, the local governments should take effective measures to strengthen the management of territorial development in future. 展开更多
关键词 land-use change spatial-temporal characteristics remote sensing Major Function-oriented Zones China
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Spatiotemporal characteristics, patterns, and causes of land-use changes in China since the late 1980s 认领 引用 被引量：364
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作者 LIU Jiyuan KUANG Wenhui +13 位作者 ZHANG Zengxiang XU Xinliang QIN Yuanwei NING Jia ZHOU Wancun ZHANG Shuwen LI Rendong YAN Changzhe WU Shixin SHI Xuezheng JIANG Nan YU Dongsheng PAN Xianzhang CHI Wenfeng 《Journal of Geographical Sciences》 SCIE CSCD 2014年第2期195-210,共16页
Land-use/land-cover changes （LUCCs） have links to both human and nature inter- actions. China＇s Land-Use/cover Datasets （CLUDs） were updated regularly at 5-year inter- vals from the late 1980s to 2010, with stand... Land-use/land-cover changes （LUCCs） have links to both human and nature inter- actions. China＇s Land-Use/cover Datasets （CLUDs） were updated regularly at 5-year inter- vals from the late 1980s to 2010, with standard procedures based on Landsat TM／ETM＋ im- ages. A land-use dynamic regionalization method was proposed to analyze major land-use conversions. The spatiotemporal characteristics, differences, and causes of land-use changes at a national scale were then examined. The main findings are summarized as fol- lows. Land-use changes （LUCs） across China indicated a significant variation in spatial and temporal characteristics in the last 20 years （1990-2010）. The area of cropland change de- creased in the south and increased in the north, but the total area remained almost un- changed. The reclaimed cropland was shifted from the northeast to the northwest. The built-up lands expanded rapidly, were mainly distributed in the east, and gradually spread out to central and western China. Woodland decreased first, and then increased, but desert area was the opposite. Grassland continued decreasing. Different spatial patterns of LUC in China were found between the late 20th century and the early 21st century. The original 13 LUC zones were replaced by 15 units with changes of boundaries in some zones. The main spatial characteristics of these changes included （1） an accelerated expansion of built-up land in the Huang-Huai-Hai region, the southeastern coastal areas, the midstream area of the Yangtze River, and the Sichuan Basin; （2） shifted land reclamation in the north from northeast China and eastern Inner Mongolia to the oasis agricultural areas in northwest China; （3） continuous transformation from rain-fed farmlands in northeast China to paddy fields; and （4） effective- ness of the ＂Grain for Green＂ project in the southern agricultural-pastoral ecotones of Inner Mongolia, the Loess Plateau, and southwestern mountainous areas. In the last two decades, although climate change in the north affected the change in cropland, policy regulation and economic driving forces were still the primary causes of LUC across China. During the first decade of the 21st century, the anthropogenic factors that drove variations in land-use pat- terns have shifted the emphasis from one-way land development to both development and conservation. The ＂dynamic regionalization method＂ was used to analyze changes in the spatial patterns of zoning boundaries, the internal characteristics of zones, and the growth and decrease of units. The results revealed ＂the pattern of the change process,＂ namely the process of LUC and regional differences in characteristics at different stages. The growth and decrease of zones during this dynamic LUC zoning, variations in unit boundaries, and the characteristics of change intensities between the former and latter decades were examined. The patterns of alternative transformation between the ＂pattern＂ and ＂process＂ of land use and the causes for changes in different types and different regions of land use were explored. 展开更多
关键词 satellite remote sensing land-use change characteristics spatial pattern China
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Effects of different land-use systems (grazing and understory cultivation) on growth and yield of semi-arid oak coppices 认领 引用 被引量：2
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作者 Ali Soltani Hamdollah Sadeghi Kaji Saleh Kahyani 《Journal of Forestry Research》 SCIE CAS CSCD 2020年第6期2235-2244,共10页
The present study examines the extent of negative eff ects of traditional multiple land-use systems on oak coppices,from a forest management point of view.The study area was located in approximately 10,000 ha of hilly... The present study examines the extent of negative eff ects of traditional multiple land-use systems on oak coppices,from a forest management point of view.The study area was located in approximately 10,000 ha of hilly Brant’s oak(Quercus brantii Lindl.)woodlands in the central Zagros Mountains.In the same site-quality class,three land-use systems were compared:simple coppice(Co),coppice in conjunction with small ruminant grazing(CoG),and coppice with understory rain-fed wheat cultivation plus grazing(CoCG).Data on total wood volume of trunk and major branches,and annual ring growth,were collected and analyzed from 74 stands in 15 coppiced woodland patches.The results showed the advantage of Co over CoG and CoCG land-uses by 43 and 60 m 3 of mean accumulated wood volume per hectare,respectively.The diameter growth analysis also revealed an annual increase in wood production of trees in Co land-uses over 43 years,with an exception of the recent decade,when growth coincided with a severe drought.Using a back-extrapolation method,the minimum rotation age of woodlands in Co land-use was found to be 23.6 years,5 and 7 years shorter than those of CoG and CoCG land-uses,respectively.Unlike CoCG,woodlands located in Co and CoG land-use systems demonstrated a high level of agreement with self-thinning rule of−3/2.Values for the stand density index for coppiced oak woodlands were between more than 1000 for the least disturbed(Co)and less than 400 for the most disturbed woodlands(CoCG).The structure and growth rate of the coppiced oak woodlands were irreversibly disrupted by understory tillage plus grazing and in less extent by grazing alone.It was concluded that ending undergrowth cultivation in semi-arid oak coppices should be addressed as a priority by adopting minimum regulations. 展开更多
关键词 Coppicing Land-use impact assessment Diameter growth Multi-purpose land-use Self-thinning rule Stand density index
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Land-use impact on soil carbon and nitrogen sequestration in typical steppe ecosystems, Inner Mongolia 认领 引用 被引量：19
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作者 HE Nianpeng ZHANG Yunhai +3 位作者 DAI Jingzhong HAN Xingguo BAOYIN Taogetao YU Guirui 《Journal of Geographical Sciences》 SCIE CSCD 2012年第5期859-873,共15页
To explore the optimal land-use for soil carbon （C） sequestration in Inner Mongolian grasslands, we investigated C and nitrogen （N） storage in soil and soil fractions in 8 floristi- cally and topographically simil... To explore the optimal land-use for soil carbon （C） sequestration in Inner Mongolian grasslands, we investigated C and nitrogen （N） storage in soil and soil fractions in 8 floristi- cally and topographically similar sites which subjected to different lancl-use types （free-grazing, grazing exclusion, mowing, winter grazing, and reclamation）. Compared with free-grazing grasslands, C and N storage in the 0-50 cm layer increased by 18.3% （15.5 Mg C ha-1） and 9.3% （0.8 Mg N ha-1） after 10-yr of grazing exclusion, respectively, and 21.9% （18.5 Mg C ha-1） and 11.5% （0.9 Mg N ha-1） after 30-yr grazing exclusion, respectively. Similarly, soil C and N storage increased by 15.3% （12.9 Mg C ha-1） and 10.2% （0.8 Mg N ha-1） after 10-yr mowing, respectively, and 19.2% （16.2 Mg C ha-1） and 7.1% （0.6 Mg N ha-1） after 26-yr mowing, respectively. In contrast, soil C and N storage declined by 10.6% （9.0 Mg C ha-1） and 11.4% （0.9 Mg N ha-1） after 49-yr reclamation, respectively. Moreover, increases in C and N storage mainly occurred in sand and silt fractions in the 0-10 cm soil layer with grazing exclusion and mowing. Our findings provided evidence that Inner Mongolian grassslands have the capacity to sequester C and N in soil with improved management practices, which were in the order： grazing exclusion 〉 mowing 〉 winter grazing 〉 reclamation. 展开更多
关键词 carbon grazing land-use nitrogen reclamation soil fractions
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Long-term impacts of land-use change on dynamics of tropical soil carbon and nitrogen pools 认领 引用 被引量：28
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作者 YANGJing-cheng HUANGJian-hui +2 位作者 PANQing-min TANGJian-wei HANXing-guo 《Journal of Environmental Sciences》 SCIE EI CAS 2004年第2期256-261,共6页
Land-use changes, especially the conversion of native forest vegetation to cropland and plantations in tropical region, can alter soil C and N pools and N availability for plant uptake. Deforestation, followed by shif... Land-use changes, especially the conversion of native forest vegetation to cropland and plantations in tropical region, can alter soil C and N pools and N availability for plant uptake. Deforestation, followed by shifting cultivation and establishment of rubber tree plantation, is a common land-use change in Xishuangbanna, southwest China. However the influence of this kind of land-use change on soil C and N dynamics in this region remains poorly understood. This study was conducted to assess the effects of land-use change on soil C and N pools. Soil samples were collected on five adjacent plots, which belong to three land-use types including secondary forest-an acuminate banana(Musa itinerans) secondary forest and a male bamboo(Dendrocalamus membranaceae) secondary forest, shifting cultivation, and rubber tree (Hevea brasiliensis (H.B.K.) Muell. Arg.) plantation(one plot is 3-year-old, and another is 7-year-old). We measured soil bulk density (BD), pH value, moisture content and concentrations of soil organic carbon(SOC), total soil nitrogen(TSN), and inorganic N(NO - 3-N and NH + 4-N ) at 0—3, 3—20, 20—40 and 40—60 cm depths, and calculated C and N pools in 0—20, 20—40, 40—60, and 0—60 cm soil layers. Compared with the adjacent secondary forests, shifting cultivation and establishment of rubber tree plantations resulted in significant decline in concentrations and stocks of SOC and TSN in 0—20 and 0—60 cm soil layers, and increase in pH and bulk density at 0—3, 3—20, and 20—40 cm depths. Soil moisture content decreased only in 0—20 cm surface soils in shifting cultivation and plantations. The dynamics of mineral N was much more complex, which had different trends among depths and ecosystems. Compared with the secondary forests, SOC stocks in 0—20 cm surface soils in shifting cultivation and rubber tree plantations(3-year-old plantation and 7-year-old plantation) decreased by 34.0%, 33%, and 23%; and TSN stocks decreased by 32 2%, 20.4%, and 20.4%, respectively, whereas the decreases of SOC and TSN stocks in 0—60 cm soil layers were much less. The results indicated that C and N losses were mainly occurred in 0—20 cm surface soil, followed by 20—40 cm layer. 展开更多
关键词 soil organic carbon(SOC) total soil nitrogen(TSN) inorganic nitrogen land-use change tropical soil Xishuangbana
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A review on trade-off analysis of ecosystem services for sustainable land-use management 认领 引用 被引量：42
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作者 邓祥征 李志慧 John GIBSON 《Journal of Geographical Sciences》 SCIE CSCD 2016年第7期953-968,共16页
Ecosystem services are substantial elements for human society. The central challenge to meet the human needs from ecosystems while sustain the Earth's life support systems makes it urgent to enhance efficient natu... Ecosystem services are substantial elements for human society. The central challenge to meet the human needs from ecosystems while sustain the Earth's life support systems makes it urgent to enhance efficient natural resource management for sustainable ecological and socioeconomic development. Trade-off analysis of ecosystem services can help to identify optimal decision points to balance the costs and benefits of the diverse human uses of ecosystems. In this sense, the aim of this paper is to provide key insights into ecosystem services trade-off analysis at different scales from a land use perspective, by comprehensively reviewing the trade-offs analysis tools and approaches that addressed in ecology, economics and other fields. The review will significantly contribute to future research on trade-off analysis to avoid inferior management options and offer a win-win solution based on comprehensive and efficient planning for interacting multiple ecosystem services. 展开更多
关键词 ecosystem services trade-offs land-use management scale integrated modeling multi-criteria analysis efficiency frontier
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Spatial relationship of high-speed transportation construction and land-use efficiency and its mechanism:Case study of Shandong Peninsula urban agglomeration 认领 引用 被引量：13
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作者 CUI Xuegang FANG Chuanglin +1 位作者 WANG Zhenbo BAO Chao 《Journal of Geographical Sciences》 SCIE CSCD 2019年第4期549-562,共14页
Land-use efficiency is low for the urban agglomeration of China. High-speed transportation construction has been an important factor driving land use change. It is critically important to explore the spatial relations... Land-use efficiency is low for the urban agglomeration of China. High-speed transportation construction has been an important factor driving land use change. It is critically important to explore the spatial relationship between the high-speed transportation superiority degree and land-use efficiency. We built a model to evaluate the benefits of convenient high-speed transportation using the relative density of highways and the distance from high-speed rail stations and airports as a metric. We used 42 counties of the Shandong Peninsula urban agglomeration as an example. Land-use efficiency was calculated by a DEA model with capital, labor, economic benefits and environmental benefits as input and output factors. We examined the spatial relationships between high-speed transport superiority degree and land-use efficiency and obtained the following results. First, there are significant spatial differences in the relationships between the high-speed transportation superiority degree and land-use efficiency. Taking the two major cities of Jinan and Qingdao as the hubs, the core surrounding counties show significant spatial relationship between land-use efficiency and the high-speed transportation superiority degree. Spatial correlation declines as the distance from the hubs increases. Land-use efficiency is less than high-speed transportation convenience in areas along the transportation trunks that are distant from the hub cities. Correlation is low in areas that are away from both hub cities and transportation trunk routes. Second, high-speed transportation has a positive relationship with land-use efficiency due to the mechanism of element agglomeration exogenous growth. Third, high-speed transportation facilitates the flow of goods, services and technologies between core cities and peripheral cities as space spillover(the hub effect). This alters the spatial pattern of regional land-use efficiency. Finally, the short-board effect caused by decreased high-speed transport construction can be balanced by highway construction and the proper node layouts of high-speed rail stations and airports, resulting in a well-balanced spatial pattern of land-use efficiency. 展开更多
关键词 high-speed transportation superiority degree DEA land-use efficiency spatial relationship Shandong Peninsula urban agglomeration
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Land-use induced changes in topsoil organic carbon stock of paddy fields using MODIS and TM/ETM analysis:A case study of Wujiang County,China 认领 引用 被引量：15
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作者 GAO, Jianfeng PAN, Genxing +2 位作者 JIANG, Xiaosan PAN, Jianjun ZHUANG, Dafang 《Journal of Environmental Sciences》 SCIE EI CAS 2008年第7期852-858,共7页
Topsoil soil organic carbon (SOC) that plays an important role in mitigating atmospheric carbon dioxide (CO_2) buildup is greatly affected by human activities.To evaluate the influence of land-use changes on SOC stock... Topsoil soil organic carbon (SOC) that plays an important role in mitigating atmospheric carbon dioxide (CO_2) buildup is greatly affected by human activities.To evaluate the influence of land-use changes on SOC stocks in paddy soils,a new algorithm was developed by integrating MODIS (moderate resolution imaging spectral-radiometer) and TM/ETM data for timely monitoring the land-use change in Wujiang County.Thereafter,the land-use class-maps derived from MODIS and TM/ETM analyses were further used to estima... 展开更多
关键词 soil organic carbon （SOC） MODIS TM/ETM rice paddies land-use soil C sequestration
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Application of Land-use Change Model in Guiding Regional Planning:A Case Study in Hun-Taizi River Watershed,Northeast China 认领 引用 被引量：12
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作者 LIU Miao HU Yuanman +3 位作者 ZHANG Wei ZHU Junjun CHEN Hongwei XI Fengming 《Chinese Geographical Science》 SCIE CSCD 2011年第5期609-618,共10页
This paper firstly investigated the land-use and land-cover change （LUCC） in the Hun-Taizi River water- shed, Northeast China from 1988 to 2004 based on remotely sensed images and geographic information systems （GI... This paper firstly investigated the land-use and land-cover change （LUCC） in the Hun-Taizi River water- shed, Northeast China from 1988 to 2004 based on remotely sensed images and geographic information systems （GIS） technology. Then, using the famous land-use change model of Conversion of Land Use and its Effects at Small re- gional extent （CLUE-S）, this paper simulated the land use changes under historical trend （HT）, urban planning （UP） and ecological protection （EP） scenarios considering urban planning and ecological protection over the next 20 years. The simulated results under UP scenario in 2020 were compared with the planning map to assess the feasibility of us- ing land-use change model to guide regional planning. Results show that forest land, dry farmland, paddy, and shrub land were the main land-use categories. Paddy and dry farmland being converted to urban area and rural settlement characterized the land-use change from 1988 to 2004. The main land-use categories changed over time. Landscape-pattem fragmentation will be worse under HT and UP scenarios, but better in EP scenario. The comparing results of simulated map with planning map in 2020 show that land-use change model is powerful tool to guide regional planning. Land-use scenarios can support regional planning and policy-making through analyzing future consequences scientifically. 展开更多
关键词 land-use change model CLUE-S regional planning Hun-Taizi River watershed
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Impacts of land-use change on ecosystem service value in Changsha,China 认领 引用 被引量：8
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作者 刘云国 曾晓霞 +4 位作者 徐立 田大伦 曾光明 胡新将 唐寅芳 《Journal of Central South University》 SCIE EI CAS 2011年第2期420-428,共9页
Changsha,a typical city in central China,was selected as the study area to assess the variations of ecosystem service value on the basis of land-use change. The analysis not only included the whole city but also the u... Changsha,a typical city in central China,was selected as the study area to assess the variations of ecosystem service value on the basis of land-use change. The analysis not only included the whole city but also the urban district where the landscape changed more rapidly in the center of the city. Two LANDSAT TM data sets in 1986 and 2000 and land use data of five urban districts from 1995 to 2005 were used to estimate the changes in the size of six land use categories. Meanwhile,previously published value coefficients were used to detect the changes in the value of ecosystem services delivered by each land category. The result shows that the total value of ecosystem services in Changsha declines from $1 009.28 million per year in 1986 to $938.11 million per year in 2000. This decline is largely attributable to the increase of construction land,and the conversion from woodland and water body to cropland to keep the crop production. In the five districts,there is $6.19 million decline in ecosystem service value between 1995 and 2005. Yuelu District has the highest unit ecosystem service value while Yuhua District has the lowest one. This may be attributed to the greater conversion from cropland and grassland to woodland and water body with the increase of construction land in Yuelu District. It is suggested that the increase rate of construction land should be controlled rigorously and the area of woodland and water body should be increased or at least retained in the study area. 展开更多
关键词 land-use change urban expansion city scale district scale central China Changsha
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