The causes and environmental effects of land use conversion during agricultural restructuring in Northeast China  

东北地区农业结构转型时期土地利用变化的成因与效应

作　　者：刘彦随  甘红  Jay GAO  DENG Xusheng  

机构地区：[1]Inst. of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China [2]Inst. of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China, Graduate School of Chinese Academy of Sciences,Beijing 100039,China [3]School of Geography and Environmental Sciences,University of Auckland,Auckland,New Zealand

出　　处：《Journal of Geographical Sciences》2004年第4期488-494,共7页地理学报（英文版）

基　　金：中国科学院知识创新工程项目，国家自然科学基金

摘　　要：During the last decade of the 20th century, extensive conversion inagricultural land use took place in Northeast China. The goal of this study is to ascertain itsspatial distribution and regional differentiation, determine its causes, and analyze itsenvironmental impact. Especially we attempt to elucidate how institutional constraints havefacilitated the change at a time of agrarian restructuring when newly emerging free market washybridized with the former planned economy. Information on six categories of land use was mappedfrom interpretation of Landsat TM images recorded in 1990, 1995 and 2000. Most of land use changestook place during the first half of the decade, coinciding with abrupt and chaotic changes ingovernment directives. Farmland was changed mainly to woodland, water body and built-up areas whilewoodland and grassland were converted chiefly to farmland. Spatially, the change from farmland towoodland was restricted to the west of the study area. The change from grassland to farmland tookplace in the grazing and farming interlocked west. These chaotic and occasionally conflictingchanges were largely caused by lack of stability and consistency in agricultural land use policiespromulgated. They have exerted adverse impacts on the local environment, including land degradation,increased flooding, and modified climate regime.During the last decade of the 20th century, extensive conversion inagricultural land use took place in Northeast China. The goal of this study is to ascertain itsspatial distribution and regional differentiation, determine its causes, and analyze itsenvironmental impact. Especially we attempt to elucidate how institutional constraints havefacilitated the change at a time of agrarian restructuring when newly emerging free market washybridized with the former planned economy. Information on six categories of land use was mappedfrom interpretation of Landsat TM images recorded in 1990, 1995 and 2000. Most of land use changestook place during the first half of the decade, coinciding with abrupt and chaotic changes ingovernment directives. Farmland was changed mainly to woodland, water body and built-up areas whilewoodland and grassland were converted chiefly to farmland. Spatially, the change from farmland towoodland was restricted to the west of the study area. The change from grassland to farmland tookplace in the grazing and farming interlocked west. These chaotic and occasionally conflictingchanges were largely caused by lack of stability and consistency in agricultural land use policiespromulgated. They have exerted adverse impacts on the local environment, including land degradation,increased flooding, and modified climate regime.

关 键 词：land use conversion agricultural restructuring remote sensing environmental effects northeast China 

分 类 号：F301.24[经济管理—产业经济]