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Exploration of Integrated Theory and Practical Teaching Mode for Chemical Engineering Principles under the Emerging Engineering Background 认领 引用
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作者 Yue Gao Xuan Qi +1 位作者 Zhifeng Yang Ying Gao 《Journal of Contemporary Educational Research》 2026年第7期204-210,共7页
The construction of emerging engineering disciplines focuses on industrial transformation and upgrading as well as talent demands in emerging chemical sectors, putting forward innovation requirements for the tradition... The construction of emerging engineering disciplines focuses on industrial transformation and upgrading as well as talent demands in emerging chemical sectors, putting forward innovation requirements for the traditional classroom teaching of Chemical Engineering Principles. As a core course linking basic theories and engineering applications for chemical majors, it is confronted with prevalent practical difficulties including abstract theoretical formulas, disconnection between classroom lectures and industrial realities, and separation of theoretical learning from practical application. Based on the talent cultivation objectives of emerging engineering education, this paper takes integrating theoretical knowledge into the classroom and connecting classroom teaching with engineering scenes as the core idea, and constructs a new integrated teaching mode from four dimensions: reconstruction of teaching content, innovation of classroom teaching methods, integrated design of theory and practice, and diversified assessment mechanisms. Classroom practice is carried out around typical unit operations such as fluid transportation, heat transfer, and distillation. Practical results show that the integrated classroom can reduce students’ difficulty in understanding theories and strengthen their engineering thinking, meeting the employment standards of emerging engineering industries including the new energy chemical industry and the green chemical industry. It can provide references for classroom reform of similar engineering majors. 展开更多
关键词 Emerging engineering Chemical Engineering Principles Classroom teaching Integration of theory and practice Teaching mode
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Shaping Resilient Edible Cities:Innovative Aquaponics for Sustainable Food-Water-Energy Nexus 认领 引用 被引量：1
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作者 Qiuling Yuan Fanxin Meng +4 位作者 Yingxuan Liu Jose A.Puppim de Oliveira Lixiao Zhang Wenting Cai Zhifeng Yang 《Engineering》 SCIE EI CSCD 2025年第7期245-258,共14页
Urban food systems need remedies due to the global rise of food insecurity. Aquaponics has emerged as a circular agricultural mode to shape edible cities and features multiple food-water-energy (FWE) nexus. Here we pr... Urban food systems need remedies due to the global rise of food insecurity. Aquaponics has emerged as a circular agricultural mode to shape edible cities and features multiple food-water-energy (FWE) nexus. Here we provide a generalizable methodology and framework to capture the FWE nexus flows of aquaponics systems within city jurisdiction. To test the framework in Beijing, China, we offer an evidence-based tradeoff analysis of urban rooftop aquaponics (RA) and ground aquaponics (GA) from a FWE nexus perspective. The results show that urban aquaponics performs well in terms of water effi-ciency, which saves 42%-44% of water consumption than traditional greenhouses (TG) during the on-farm stage, but generates 2.3-3.0 times higher energy consumption and 1.1-2.1 times more carbon emis-sions. “From farm to table” aquaponics helps decrease 14%-44% of the energy, water, and carbon impacts during the off-farm stage. With diversely optimized strategies for renewable electricity, fish food, infras-tructure materials, and recycling actions, urban aquaponics can hopefully reduce energy consumption and carbon emissions by 80%-85% in the on-farm stage. In addition to greenhouse agriculture, utilizing a total of 155 km2 of RA and GA potential areas could increase urban vegetable self-sufficiency by 15%, and avoid 82% of the energy, water, and carbon footprints during upstream food supply chains beyond cities. Our findings could provide policy insights for urban stakeholders to create edible landscapes by integrating RA and GA, and thus direct resilient and sustainable agricultural transformation. 展开更多
关键词 Aquaponics Food-water-energy nexus Rooftop agriculture Food system Urban resilience
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Parameter determination to calculate water environmental capacity in Zhangweinan Canal Sub-basin in China 认领 引用 被引量：23
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作者 Yingxia Li Ruzhi Qiu +2 位作者 Zhifeng Yang Chunhui Li Jingshan Yu 《Journal of Environmental Sciences》 SCIE EI CAS 2010年第6期904-907,共4页
Zhangweinan canal sub-basin(ZWN)has the most serious water resource shortage and water pollution problems in north of China.To calculate the water environmental capacity in ZWN,determination methods for design flow ra... Zhangweinan canal sub-basin(ZWN)has the most serious water resource shortage and water pollution problems in north of China.To calculate the water environmental capacity in ZWN,determination methods for design flow rates and degradation coefficients were discussed in this study.Results showed that 90%and 50%hydrological guarantee flow rates were suitable to be the design flow rates for rainy and dry seasons,respectively.Degradation coefficients of CODMn and NH3-N were 0.25 day^-1 and 0.15 day^-1 for branch streams and 0.5 day^-1 and 0.25 day^-1 for mainstreams,respectively in ZWN.With one-dimensional water quality simulation model,water environmental capacities were calculated to be 82,139 tons/yr for CODMn and 2394 tons/yr for NH3-N in ZWN. 展开更多
关键词 degradation coefficient design flow rate water environmental capacity Zhangweinan
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Can the Grain-for-Green Program Really Ensure a Low Sediment Load on the Chinese Loess Plateau? 认领 引用 被引量：9
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作者 Pengcheng Sun Yiping Wu +4 位作者 Zhifeng Yang Bellie Sivakumar Linjing Qiu Shuguang Liu Yanpeng Cai 《Engineering》 SCIE EI CAS 2019年第5期855-864,共10页
The Chinese Loess Plateau is the most seriously eroded area in the world and contributes the vast majority of the sediment that goes into the Yellow River.Since the 1950s,progressive soil and water conservation measur... The Chinese Loess Plateau is the most seriously eroded area in the world and contributes the vast majority of the sediment that goes into the Yellow River.Since the 1950s,progressive soil and water conservation measures have been implemented—in particular,large-scale ecological restoration has been ongoing since 1999—resulting in a significant reduction of the sediment load.However,the mechanism of the sediment transport dynamics is not fully understood due to multiple and complicated influencing factors including climate change and human activities(e.g.,ecological restoration).A challenging question,then,arises:Is the current low sediment level a“new normal”in this era and in the future?To address this question,we selected a typical loess hilly region where considerable ecological restoration has been implemented,and which is regarded as the site of the first and most representative Grainfor-Green program in the Loess Plateau.We investigated the evolution of discharge–sediment relationships in the past decades(1960–2010)and their association with the soil and water conservation measures in this area.The results showed that there was a distinct change in the regression parameters of the commonly used annual discharge–sediment regression equation—a continuously increasing trend of parameter b and a decreasing trend of parameter a,accompanying the ecological restoration.The increase in exponent b(i.e.,a steeper slope)implies a potential lower sediment load resulting from low discharge and a potential higher sediment load resulting from large discharge.This finding may question the new normal of a low sediment level and implies the potential risk of a large sediment load during extremely wet years. 展开更多
关键词 Discharge-sediment relationship Ecological restoration Loess hilly region Sediment load Sediment rating parameters
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Growth and nutrient accumulation of Phragmites australis in relation to water level variation and nutrient loadings in a shallow lake 认领 引用 被引量：12
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作者 Ying Zhao Xinghui Xia Zhifeng Yang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2013年第1期16-25,共10页
Shallow lake eutrophication is a global environmental issue. This study investigated the effects of water level variation and nutrient loadings on the growth and nutrient accumulation of Phragmites australis （reed） ... Shallow lake eutrophication is a global environmental issue. This study investigated the effects of water level variation and nutrient loadings on the growth and nutrient accumulation of Phragmites australis （reed） by field samplings in Baiyangdian Lake, the largest shallow lake of northern China. The field samplings were conducted in two sites of different nutrient loadings during the whole growth period of reeds, and three types of zones with different water depths were chosen for each site, including the terrestrial zone with water level below the ground, the ecotone zone with the water level varying from belowground to aboveground, and the submerged zone with water level above the ground. The result showed that reed growth was more limited by water level variation than nutrient loadings. The average stem lengths and diameters in terrestrial zones were about 26.3%-27.5% and 7.2%-12.0% higher than those in submerged zones, respectively. Similarly, the terrestrial status increased the aboveground biomass of reeds by 36.6%-51.8% compared with the submerged status. Both the nutrient concentrations and storages in the aboveground reeds were mainly influenced by the nutrient loadings in surface water and sediment rather than the water level variation of the reed growth environment, and the nutrient storages reached their maxima in late August or early September. It was observed that the maximum nitrogen storage occurred in the terrestrial zone with higher nutrient loadings, with the value of 74.5 g/m2. This study suggested that water level variation and nutrient loadings should be considered when using reeds to control and remediate eutrophication of shallow lakes. 展开更多
关键词 water level variation nutrient loadings Phragmites australis reed growth nutrient accumulation
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A New Method of Assessing Environmental Flows in Channelized Urban Rivers 认领 引用 被引量：3
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作者 Xin-An Yin Zhifeng Yang +3 位作者 Enze Zhang Zhihao Xu Yanpeng Cai Wei Yang 《Engineering》 SCIE EI CAS 2018年第5期590-596,共7页
Assessing environmental flows （e-flows） for urban rivers is important for water resources planning and river protection, Many e-flow assessment methods have been established based on species＇ habitat pro- vision re... Assessing environmental flows （e-flows） for urban rivers is important for water resources planning and river protection, Many e-flow assessment methods have been established based on species＇ habitat pro- vision requirements and pollutant dilution requirements, To avoid flood risk, however, many urban rivers have been transformed into straight, trapezoidal-profiled concrete channels, leading to the disappearance of valuable species, With the construction of water pollution-control projects, pollutant inputs into rivers have been effectively controlled in some urban rivers, For these rivers, the e-flows determined by tradi- tional methods will be very small, and will consequently lead to a low priority being given to river pro- tection in future water resources allocation and management, To more effectively assess the e-flows of channelized urban rivers, we propose three e-flow degrees, according to longitudinal hydrological con- nectivity （high, medium, and low）, in addition to the pollutant dilution water requirement determined by the mass-balance equation, In the high connectivity scenario, the intent is for the e-flows to maintain flow velocity, which can ensure the self-purification of rivers and reduce algal blooms; in the medium connectivity scenario, the intent is for the e-flows to permanently maintain the longitudinal hydrological connectivity of rivers that are isolated into several ponds by means of weirs, in order to ensure the exchange of material, energy, and information in rivers; and in the low connectivity scenario, the intent is for the e-flows to intermittently connect isolated ponds every few days （which is designed to further reduce e-flows）, The proposed methods have been used in Shiwuli River, China, to demonstrate their effectiveness, The new methods can offer more precise and realistic e-flow results and can effectively direct the construction and management of e-flow supply projects, 展开更多
关键词 Environmental flow Urban river Channelized rivers River restoration
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Dynamics of Land Use/Land Cover Considering Ecosystem Services for a Dense-Population Watershed Based on a Hybrid Dual-Subject Agent and Cellular Automaton Modeling Approach 认领 引用 被引量：2
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作者 Yutong Li Yanpeng Cai +3 位作者 Qiang Fu Xiaodong Zhang Hang Wan Zhifeng Yang 《Engineering》 SCIE EI CAS CSCD 2024年第6期182-195,共14页
Land use/land cover represents the interactive and comprehensive influences between human activities and natural conditions,leading to potential conflicts among natural and human-related issues as well as among stakeh... Land use/land cover represents the interactive and comprehensive influences between human activities and natural conditions,leading to potential conflicts among natural and human-related issues as well as among stakeholders.This study introduced economic standards for farmers.A hybrid approach(CA-ABM)of cellular automaton(CA)and an agent-based model(ABM)was developed to effectively deal with social and land-use synergic issues to examine human–environment interactions and projections of land-use conversions for a humid basin in south China.Natural attributes and socioeconomic data were used to analyze land use/land cover and its drivers of change.The major modules of the CA-ABM are initialization,migration,assets,land suitability,and land-use change decisions.Empirical estimates of the factors influencing the urban land-use conversion probability were captured using parameters based on a spatial logistic regression(SLR)model.Simultaneously,multicriteria evaluation(MCE)and Markov models were introduced to obtain empirical estimates of the factors affecting the probability of ecological land conversion.An agent-based CA-SLR-MCE-Markov(ABCSMM)land-use conversion model was proposed to explore the impacts of policies on land-use conversion.This model can reproduce observed land-use patterns and provide links for forest transition and urban expansion to land-use decisions and ecosystem services.The results demonstrated land-use simulations under multi-policy scenarios,revealing the usefulness of the model for normative research on land-use management. 展开更多
关键词 Land use/land cover Human-environment interactions Agent-based model Cellular automaton
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Interactions of Microplastics and Methane Seepage in the Deep-Sea Environment 认领 引用 被引量：1
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作者 Jing-Chun Feng Zhifeng Yang +8 位作者 Wenliang Zhou Xingwei Feng Fuwen Wei Bo Li Chuanxin Ma Si Zhang Linlin Xia Yanpeng Cai Yi Wang 《Engineering》 SCIE EI CAS CSCD 2023年第10期159-167,共9页
Microplastics(MPs)are important exempla of the Anthropocene and are exerting an increasing impact on Earth’s carbon cycle.The huge imbalance between the MPs floating on the marine surface and those that are estimated... Microplastics(MPs)are important exempla of the Anthropocene and are exerting an increasing impact on Earth’s carbon cycle.The huge imbalance between the MPs floating on the marine surface and those that are estimated to have been introduced into the ocean necessitates a detailed assessment of marine MP sinks.Here,we demonstrate that cold seep sediments,which are characterized by methane fluid seepage and a chemosynthetic ecosystem,effectively capture and accommodate small-scale(<100μm)MPs,with 16 types of MPs being detected.The abundance of MPs in the surface of the sediment is higher in methane-seepage locations than in non-seepage areas.Methane seepage is beneficial to the accumulation,fragmentation,increased diversity,and aging of MPs.In turn,the rough surfaces of MPs contribute to the sequestration of the electron acceptor ferric oxide,which is associated with the anaerobic oxidation of methane(AOM).The efficiency of the AOM determines whether the seeping methane(which has a greenhouse effect 83 times greater than that of CO2over a 20-year period)can enter the atmosphere,which is important to the global methane cycle,since the deep-sea environment is regarded as the largest methane reservoir associated with natural gas hydrates. 展开更多
关键词 Microplastics Anaerobic oxidation of methane Cold seeps Diversity index Fragmentation Gas hydrates
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Watershed Ecology and Its Applications 认领 引用 被引量：9
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作者 Zhifeng Yang 《Engineering》 SCIE EI CAS 2018年第5期582-583,共2页
Global climate change and intense human activities greatly alter natural eco-hydrological processes in multi-scale watersheds, resulting in a series of threats to human society and ecosystems that include the increase... Global climate change and intense human activities greatly alter natural eco-hydrological processes in multi-scale watersheds, resulting in a series of threats to human society and ecosystems that include the increase of extreme climatic events, water quality degradation, and decreases in biodiversity and ecosystem stability. Many theories and approaches on eco- logical restoration for different types of water environments （e.g., rivers, lakes, marshes, and estuaries） have been proposed in the existing research. However, hydrologi-cal connections, mass and energy transports are usually consider- able among the different types of water environments in a watershed, and restoration measures for one component typically affect other components in the same watershed. 展开更多
关键词 全球气候变化 极端气候 生物多样性 发展现状
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Soil Organic Carbon Changes in City Areas of China Over the Past Three Decades:Implications for Achieving Carbon Neutrality 认领 引用 被引量：1
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作者 Zhenrui Zhang Xinghui Xia Zhifeng Yang 《Engineering》 SCIE EI CAS CSCD 2023年第9期11-15,共5页
The substantial amount of greenhouse gas emissions from anthropogenic activities has caused the global mean surface temperature to increase by 0.99℃since the industrial revolution[1].China is committed to achieving c... The substantial amount of greenhouse gas emissions from anthropogenic activities has caused the global mean surface temperature to increase by 0.99℃since the industrial revolution[1].China is committed to achieving carbon neutrality by 2060 in response to climate change[2].Soil stores approximately 2344–3000 Pg(1015 g)of carbon at depths of 0–100 cm in terrestrial ecosystems,an amount approximately equivalent to twice the amount in the atmospheric carbon pool and three times that in the terrestrial biomass;therefore,even a small change in soil carbon stocks will exert significant impacts on atmospheric CO2concentrations[3]. 展开更多
关键词 stores terrestrial Carbon
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Is urban development an urban river killer? A case study of Yongding Diversion Channel in Beijing, China 认领 引用 被引量：9
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作者 Xi Wang Junqi Li +4 位作者 Yingxia Li Zhenyao Shen Xuan Wang Zhifeng Yang Inchio Lou 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2014年第6期1232-1237,共6页
The high population and concrete environment alter urban areas by changing temperature, rainfall runoff, and water resource utilization activities. This study was conducted to investigate the water quality features of... The high population and concrete environment alter urban areas by changing temperature, rainfall runoff, and water resource utilization activities. This study was conducted to investigate the water quality features of the Yongding Diversion Channel in Beijing, China, and its relationship with rainfall and urban development. Monthly water quality data were obtained from April to October of 2004 at monitoring sites of Sanjiadian, Gaojing, Luodaozhuang, and Yuyuangtan. The monthly water quality grades from 2007 to 2011 were also investigated and compared with those of other rivers. Dissolved oxygen and pH showed greater decreases after one or two moderate rainfall events than several light rainfall events. The potassium permanganate index （CODMn）, ammonia nitrogen （NH3-N） and total phosphorus （TP） increased more after several light rainfall events than after one or two moderate or heavy rainfall events. Pollutant concentrations （CODMn, NH3-N, TP） in downstream regions showed greater changes than those in upstream areas after heavy rainfall events. Intense human activities around the channel greatly influenced the water quality of the channel in rainy season because of runoff pollution; however, heavy rainfall had a strong dilution effect on the pollutant concentrations in rivers. Overall, urban development has obviously deteriorated the water quality of the Yongding Diversion Channel as indicated by an increase in the water quality index from 3.22 in 2008 to 4.55 in 2010. The Pearson correlation between monthly rainfall and water quality indices from 2007 to 2011 ranged from 0.1286 to 0.6968, generally becoming weaker as rainfall and rainfall runoff became more random and extreme. 展开更多
关键词 rainfallurban development water quality indices Yongding Diversion Channel
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A system dynamics urban water management model for Macao, China 认领 引用 被引量：4
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作者 Tong Wei Inchio Lou +1 位作者 Zhifeng Yang Yingxia Li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2016年第12期117-126,共10页
Urban water resources have been facing significant pressure from population growth, urbanization, and climate change. A system dynamics urban water management model was proposed to simulate the dynamic interactions be... Urban water resources have been facing significant pressure from population growth, urbanization, and climate change. A system dynamics urban water management model was proposed to simulate the dynamic interactions between urban water demands and society, economy, climate, and water conservation. The residents＇ water conseration willingness was incorporated in the model and water-saving effects were quantified. The simulation results for Macao showed that population size was the main driving force for urban water demand. The change of temperature and precipitation has obvious effects on the landscape water demand. The water demand output is sensitive to the change in population, per capita demand, and temperature. Increased precipitation will reduce urban water demand and increased economic growth will increase water demand. By implementing integrated water conservation measures and imoroved water conservation willinmaess, water demand could be reduced bv 17.5%. 展开更多
关键词 Macao System dynamics Water conservation willingness Water demand
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Research progress in cold region wetlands,China 认领 引用 被引量：2
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作者 YaYi Tan Xuan Wang +1 位作者 ZhiFeng Yang YuLi Wang 《Research in Cold and Arid Regions》 2011年第5期441-447,共7页
China has some of the most abundant wetland resources in the world.Cold region wetlands cover more than 60%of the total natural wetlands in China and play an indispensable role in global climate regulation,water holdi... China has some of the most abundant wetland resources in the world.Cold region wetlands cover more than 60%of the total natural wetlands in China and play an indispensable role in global climate regulation,water holding,uptake and emission of greenhouse gases,and biodiversity conservation.Because cold region wetlands are sensitive to climatic and environmental changes,it is important for ecological conservation and environmental management to summarize and analyze current research progress on these specific ecosystems.This paper reviews the focus of present studies on the typical cold region wetlands in the northeast region and the Qinghai-Tibet Plateau of China from several aspects as follows:types and distribution,responses of permafrost to climatic changes,uptake and emission of greenhouse gas,eco-hydrological processes,and vegetation succession.Our conclusions are:global wanning has a long-term and serious impact on cold region permafrost;emission of greenhouse gases has great temporal and spatial heterogeneity;and hygrophytes in the cold region wetlands have been generally replaced by xerophytes,although it is still unclear whether the vegetation diversity index has increased or decreased.Based on this review,some key topics for future study are recommended as follows:(1)the response of degeneration of cold region permafrost at various spatial and temporal scales;(2)prediction of wetland degeneration tendency by coupling weather,soil,and hydrological models;(3)evaluation of carbon storage;(4)the actual response mechanisms of greenhouse gases to climatic changes;and(5)development of water requirement calculation methods tailored to the unique ecosystems of cold region wetlands. 展开更多
关键词 cold region wetlands China progress review
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Navigating tipping points:A complex systems framework for anticipating lake ecosystem collapse 认领 引用 被引量：1
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作者 Hanxiao Zhang Hui Li +2 位作者 Shouliang Huo Zhifeng Yang Fengchang Wu 《Fundamental Research》 CSCD 2026年第2期592-603,共12页
Lake ecosystems are susceptible to catastrophic risks,characterized by abrupt and large-scale transitions that substantially degrade ecological integrity and compromise provision of essential ecosystem services.To bet... Lake ecosystems are susceptible to catastrophic risks,characterized by abrupt and large-scale transitions that substantially degrade ecological integrity and compromise provision of essential ecosystem services.To better understand these risks,a systems science perspective is essential,one that captures the complexity,nonlinearity,and emergent properties inherent in lake ecosystem dynamics.In this review,we synthesize the current understanding of catastrophic risks in lake ecosystems through complex adaptive systems and emphasize the feedback loops,bifurcations,and tipping points that drive regime shifts and ecosystem reorganization.Advancements in early warning signals offer promise for proactive risk management.Temporal indicators,spatial patterns,and network-based metrics can foreshadow tipping points.However,their application requires context-specific validation,because lakes exhibit heterogeneous responses to stressors.Key drivers such as eutrophication,climate change,invasive species,and anthropogenic-driven land use change interact synergistically,exacerbating systemic risks.Effective management requires resilience-building strategies,including adaptive governance,nutrient control,and restoration of buffer mechanisms.We advocate integrating dynamic modeling with multiscale monitoring to refine and optimize interventions.Future research directions should focus on unifying empirical data with theoretical frameworks,increasing the reliability of early warning signals,addressing the cascading effects of global change,and the application of artificial intelligence in monitoring and early warning.By integrating systems theory with applied limnology,this review helps guide research and policy efforts toward mitigating catastrophic risks in lake ecosystems. 展开更多
关键词 Regime shifts Resilience Eutrophication Nonlinear dynamics Ecological thresholds Adaptive management Regime shifts Resilience Eutrophication Nonlinear dynamics Ecological thresholds Adaptive management
Exogenous heatwaves amplify heat risks in China under anthropogenic climate change 认领 引用
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作者 Gang WANG Qiang ZHANG +3 位作者 Iestyn WOOLWAY Vijay SINGH Ming LUO Zhifeng YANG 《Science China Earth Sciences》 SCIE EI CSCD 2026年第5期1795-1806,共12页
Heatwaves have become more frequent and intense under anthropogenic climate change,with profound implications for both natural ecosystems and human systems.However,the transboundary migration of heatwaves over China r... Heatwaves have become more frequent and intense under anthropogenic climate change,with profound implications for both natural ecosystems and human systems.However,the transboundary migration of heatwaves over China remains unclear,overlooking the significant influence of exogenous heatwaves—those originating outside the region—hampers accurate predictions and effective mitigation strategies to deadly heatwaves.Here we assess the impacts of exogenous heatwaves on heat risks across China using a Lagrangian tracking approach.Surprisingly,our results reveal that 42.7%of heatwaves in China are linked to exogenous heatwaves.These external extreme heat events have shown a marked increase(4.35 events/decade),affecting the entire country,especially the northwest,northeast,and southeastern coastal regions.China experiences approximately 3.49 days of exogenous heatwave exposure per year,with an upward trend of 1.42 days/decade.Anthropogenic climate change emerges as the primary driver behind the intensification and increasing exogenous heatwaves.Future projections suggest that exogenous heatwaves will worsen and become the dominant type.At the 1.5℃ global warming level under the SSP585 scenario,exposure to exogenous heatwaves is projected to increase by 236.3%,frequency by 188.3%,cumulative heat by 313.4%,and the affected area by 98.5%compared to historical baseline.Limiting global warming to 0.5℃ could prevent 28.7% of exogenous heatwave exposure,39.8%of population exposure,and 31.3%of economic losses in China.This study underscores the critical role of exogenous heatwaves in amplifying regional heatwave impacts,highlighting the need for targeted mitigation efforts to address this growing deadly threat. 展开更多
关键词 Exogenous heatwaves Spatiotemporally contiguous heatwaves Anthropogenic climate warming Global warming level Attribution analysis
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An improved ET control method to determine the water-saving potential for farmland in Baiyangdian Watershed, China 认领 引用 被引量：4
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作者 Aiping PANG Chuihui LI +1 位作者 Tao SUN Zhifeng YANG 《Frontiers of Earth Science》 SCIE CSCD 2013年第2期151-158,共8页
Resource-based water-saving potential has been recognized as the reduction of evapotranspiration and water loss of inefficient irrigation systems. In this paper, an improved evapotranspiration control model is applied... Resource-based water-saving potential has been recognized as the reduction of evapotranspiration and water loss of inefficient irrigation systems. In this paper, an improved evapotranspiration control model is applied to calculate resource-based water-saving potential, considering the influences of effective rainfall （uncontrolled evapotranspiration） and irrigated water （controlled evapotranspiration）. Farmland in Baiyangdian Watershed, a highly productive area in northern China, is analyzed to determine the water-saving potential of irrigation processes. The water-saving potential was zero, 163.90 × 10^6m3, and 318.24 × 10^6m3 in wet, normal, and dry years, respectively, and was greater in years with less rainfall. Under the combined effect of rainfall, crop water consumption, and crop water requirements, the water-saving potential showed obvious temporal and spatial variations. July and August comprised almost 98.6% of the annual potential. In the northeast and southwest corner of the study area, potential approached zero. The potential was 1.53 times greater in the north-central than in the south-central area. The model can furnish the appropriate timing and region to water managers for implementing water-saving strategies. 展开更多
关键词 resources-based water-saving potential evapotranspiration improved evapotranspiration control model Baiyangdian Watershed
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Eco-environmental water demands for the Baiyangdian Wetland 认领 引用 被引量：4
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作者 Ping ZHONG Zhifeng YANG +1 位作者 Baoshan CUI Jingling LIU 《Frontiers of Environmental Science & Engineering》 2008年第1期73-80,共8页
In recent years,the hydrological characters of Baiyangdian Wetland have changed greatly,which,in turn,influence the biotic component,the structure and function of the wetland ecosystem.In order to determine the demand... In recent years,the hydrological characters of Baiyangdian Wetland have changed greatly,which,in turn,influence the biotic component,the structure and function of the wetland ecosystem.In order to determine the demands for water resources of ecological wetland system,a method of ecological water level coefficient was suggested to calculate the water resources demands for wetland environment use.This research showed that the minimum coefficient is 0.94 and the optimal coefficient is more than 1.10.According to these two coefficients,the ecological water level and water quantity can be estimated.The results indicate that the amount of the minimal and optimal eco-environmental water require-ments are 0.87×108 and 2.78×108m3 in average monthly,respectively,with the maximum eco-environmental water requirement in summer and the minimum in winter.The annual change of eco-environment water demand is in accord-ing with the climate change and hydrological characters.The method of ecological water level emphasizes that wetland ecosystem adapts to the hydrological conditions,so it can be used in practice well. 展开更多
关键词 ecological water level eco-environmental water requirements ecological water level coefficient Baiyangdian Wetland
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Moving transmission centers of embodied forage-livestock conflicts from non-pastoral provinces to pastoral provinces in China 认领 引用
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作者 Mingyue Yang Sai Liang +2 位作者 Haifeng Zhou Ke Li Zhifeng Yang 《Fundamental Research》 CSCD 2025年第4期1622-1630,共9页
Forage-livestock conflict(FLC)causes rangeland degradation and poses a threat to climate change mitigation,food security,and sustainable development.Previous studies have investigated the hotspots of in situ FLCs.Howe... Forage-livestock conflict(FLC)causes rangeland degradation and poses a threat to climate change mitigation,food security,and sustainable development.Previous studies have investigated the hotspots of in situ FLCs.However,region-sectors of supply chains transferring embodied FLCs are overlooked.This study identifies transmission centers of embodied FLCs in China during 2005-2015 based on multi-regional input-output analysis.The results show that transmission centers are mostly light industries,such as the“agricultural and sideline products processing”sectors of Inner Mongolia and Shandong and the“textile industry”sector of Jiangsu.Moreover,the geographical distribution of transmission centers changed during 2005-2015.In particular,several transmission centers were moving from non-pastoral provinces to pastoral provinces.This is influenced by structural changes in supply chains.The findings of this study provide deep leverage points of interventions.They can support effective productivity improvement measures and intersectoral cooperation to control FLCs,and can therefore combat rangeland degradation. 展开更多
关键词 Rangeland Forage-livestock conflict Transmission center Supply chains Human-environment system Betweenness
A Bayesian method for comprehensive water quality evaluation of the Danjiangkou Reservoir water source area, for the middle route of the South-to-North Water Diversion Project in China 认领 引用 被引量：15
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作者 Fangbing MA Chunhui LI +3 位作者 Xuan WANG Zhifeng YANG Chengchun SUN Peiyu LIANG 《Frontiers of Earth Science》 SCIE CSCD 2014年第2期242-250,共9页
The Danjiangkou Reservoir is the water source for the middle route of the South-to-North Water Diversion Project in China. Thus, its water quality status is of great concern. Five water quality indicators （dissolved ... The Danjiangkou Reservoir is the water source for the middle route of the South-to-North Water Diversion Project in China. Thus, its water quality status is of great concern. Five water quality indicators （dissolved oxygen, permanganate index, ammonia nitrogen, total nitrogen, and total phosphorus）, were measured at three monitoring sites （the Danjiangkou Reservoir dam, the Hejiawan and the Jiangbei bridge）, to investigate changing trends, and spatiotemporal characteristics of water quality in the Danjiangkou Reservoir area from January 2006 to May 2012. We then applied a Bayesian statistical method to evaluate the water quality comprehensively. The normal distribution sampling method was used to calculate likelihood, and the entropy weight method was used to determine indicator weights for variables of interest in to the study. The results indicated that concentrations of all five indicators increased during the last six years. In addition, the water quality in the reservoir was worse during the wet season （from May to October）, than during the dry season （from November to April of the next year）. Overall, the probability of the water＇s belonging to quality category of type lI, according to environmental quality standards for surface water in China, was 27.7%-33.7%, larger than that of its belonging to the other four water quality types. The increasing concentrations of nutrients could result in eutrophication of the Danjiangkou Reser- voir. This method reduced the subjectivity that is commonly associated with determining indicator weights and artificial classifications, achieving more reliable results. These results indicate that it is important for the interbasin water diversion project to implement integrated water quality management in the Danjiangkou Reservoir area. 展开更多
关键词 water quality evaluation Danjiangkou Reser-voir Bayesian method normal distribution samplingmethod entropy weight method
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Deep-sea organisms research oriented by deep-sea technologies development 认领 引用 被引量：9
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作者 Jing-Chun Feng Jianzhen Liang +3 位作者 Yanpeng Cai Si Zhang Jingchuan Xue Zhifeng Yang 《Science Bulletin》 SCIE EI CAS CSCD 2022年第17期1802-1816,共15页
Deep-sea environment,characterized by high pressures,extremely high/low temperatures,limited photosynthesis-generated organic matter,darkness,and high levels of corrosion,is home to flourishing special ecosystems in t... Deep-sea environment,characterized by high pressures,extremely high/low temperatures,limited photosynthesis-generated organic matter,darkness,and high levels of corrosion,is home to flourishing special ecosystems in the world.Here,we illustrate how the deep-sea equipment offers insights into the study of life in the deep sea based on the work in the past five decades.We first describe how organisms in the deep sea are studied,even though it is highly difficult to get access to such extreme environments.We then explain the role of deep-sea technologies in advancing research on the evolution of organisms in hydrothermal vents,cold seeps,seamounts,oceanic trenches,and whale falls from the following perspectives:biological diversity,mechanisms of environmental adaptation,biological evolution,and ecosystem connectivity.Finally,to better understand the function and service of deep-sea organisms,and further conserve the special creatures under anthropologic activity and climate change,we highlight the importance of innovative deep-sea technologies to promote cutting-edge research on deep-sea organisms,and note the remaining challenges and developing directions for deep-sea equipment. 展开更多
关键词 Deep sea Extreme life Equipment Biological diversity Environmental adaptation Ecosystem connectivity
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