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

过去百年松嫩平原农田扩张的干旱效应

作　　者：YU Wanhui ZHANG Lijuan ZHANG Hongwen JIANG Lanqi ZHANG Ankang Pan Tao 于万辉;张丽娟;张宏文;姜蓝齐;张安康;潘涛(Key Laboratory of Remote Sensing Monitoring of Geographic Environment,College of Heilongjiang Province,Harbin Normal University,Harbin 150025,China;Key Laboratory of Land Surface Process and Climate Change in Northwest Institute of Eco-Environment and Resources,CAS,Lanzhou 730000,China;Heilongjiang Province Institute of Meteorological Sciences,Innovation and Opening Laboratory of Regional Eco-Meteorology in Northeast,China Meteorological Administration,Harbin 150030,China)

机构地区：[1]Key Laboratory of Remote Sensing Monitoring of Geographic Environment,College of Heilongjiang Province,Harbin Normal University,Harbin 150025,China [2]Key Laboratory of Land Surface Process and Climate Change in Northwest Institute of Eco-Environment and Resources,CAS,Lanzhou 730000,China [3]Heilongjiang Province Institute of Meteorological Sciences,Innovation and Opening Laboratory of Regional Eco-Meteorology in Northeast,China Meteorological Administration,Harbin 150030,China

出　　处：《Journal of Geographical Sciences》2020年第3期439-454,共16页地理学报（英文版）

基　　金：National Natural Science Foundation of China,No.41771067;Natural Science Foundation of Heilongjiang Province,No.D2018007。

摘　　要：The effects of human activities on climate change are a significant area of research in the field of global environmental change.Land 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 important.From 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 climate.In 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 data.The resulting dryness index,Palmer drought severity index,and standardized precipitation index values indicated a significant drying trend in the study area from 1981 to 2010.This trend can be attributed to increases in maximum temperature and diurnal temperature range,which increased the degree of drought.Based 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 decreased.The findings indicate that farmland expansion caused a drying trend in Songnen Plain during the study period.The effects of human activities on climate change are a significant area of research in the field of global environmental change.Land 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 important.From 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 climate.In 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 data.The resulting dryness index,Palmer drought severity index,and standardized precipitation index values indicated a significant drying trend in the study area from 1981 to 2010.This trend can be attributed to increases in maximum temperature and diurnal temperature range,which increased the degree of drought.Based 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 decreased.The 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 

分 类 号：S423[农业科学—植物保护]