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Effect of farmland expansion on drought over the past century in Songnen Plain,Northeast China

Journal of Geographical Sciences 2020年第3期30卷 439-454页

作者： YU Wanhui ZHANG Lijuan ZHANG Hongwen JIANG Lanqi ZHANG Ankang Pan Tao Key Laboratory of Remote Sensing Monitoring of Geographic Environment College of Heilongjiang ProvinceHarbin Normal UniversityHarbin 150025China Key Laboratory of Land Surface Process and Climate Change in Northwest Institute of Eco-Environment and Resources CASLanzhou 730000China Heilongjiang Province Institute of Meteorological Sciences Innovation and Opening Laboratory of Regional Eco-Meteorology in NortheastChina Meteorological AdministrationHarbin 150030China

The effects of human activities on climate change are a significant area of research in the field of global environmental *** use and land cover change(LUCC)has a greater effect on climate than greenhouse gases,and the effect of farmland expansion on regional drought is particularly *** the 1910s to the 2010s,cultivated land in Songnen Plain increased by 2.67 times,the area of cultivated land increased from 4.92×10^4 km^2 to 13.14×10^4 km^2,and its percentage of all land increased from 25%to 70%.This provides an opportunity to study the effects of the conversion of natural grassland to farmland on *** this study,the drought indices in Songnen Plain were evaluated from the 1910s to the 2010s,and the effect of farmland expansion on drought was investigated using statistical methods and the Weather Research and Forecasting Model based on UK’s Climatic Research Unit *** resulting dryness index,Palmer drought severity index,and standardized precipitation index values indicated a significant drying trend in the study area from 1981 to *** trend can be attributed to increases in maximum temperature and diurnal temperature range,which increased the degree of *** on statistical analysis and simulation,the maximum temperature,diurnal temperature range,and sensible heat flux increased during the growing season in Songnen Plain over the past 100 years,while the minimum temperature and latent heat flux *** findings indicate that farmland expansion caused a drying trend in Songnen Plain during the study period.

关键词： drought effect farmland expansion centennial-scale changes Songnen Plain

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Process analysis and mitigation strategies for wetland degradation caused by increasing agricultural water demand:an ecology-economy nexus perspective

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Ecological Processes 2023年第1期12卷 560-572页

作者： Lin Jiang Hui Wang Saige Wang Wen Zhang Institute of Environment and Ecology Shandong Normal UniversityNo.1 Daxue RoadJi’nan 250358ShandongChina School of Environment Beijing Normal UniversityBeijing 100875China

Background farmland expansion has played a major role in wetland degradation in Heilongjiang Province,China in recent *** expansion increases the demands for water,thereby affecting wetland water cycles,and promoting the shrinkage of wetland areas and degradation of ecosystem *** an open system,agricultural production is limited by both ecological and socioeconomic ***,our understanding of wetland degradation caused by farmland expansion from the perspective of the ecology-economy nexus is *** A correlation between farmland expansion and agricultural economic activities was established,and wetland degradation driven by agroeconomic activities was inversely derived using a multi-regional input-output(MRIO)*** developed an ecology-economy nexus framework to explore the ecological process of the area and water demand tradeoffs between wetland degradation and farmland expansion,the economic process of wetland degradation driven by food consumption,and the nexus between the two *** finally explored strategies to mitigate wetland degradation due to increased agricultural water *** farmland expansion contributed to 93.76%of the total degraded wetland *** was a significant negative correlation between wetland area and the water consumption for crop production,but no significant correlation between wetland area and the ecological footprint of *** direct wetland degradation caused by local final demand accounted for 63.02%,while the indirect degradation caused by non-local final demand accounted for 36.98%.Hebei,Shandong,Liaoning,Inner Mongolia,and Shanghai were the top five provinces contributing to indirect wetland degradation in *** findings indicated that a mixed scenario combining water footprint reduction per unit yield with food export reduction could maximize wetland restoration while reducing local farmland-wetland competition for *** Our research

关键词： Agricultural economic activities farmland expansion Water footprint Wetland degradation Wetland restoration

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