摘要
为了探讨我国西部各省、直辖市、自治区近年来耕地变化的特点和趋势,该文基于中国环境监测总站提供的1995/1996年土地利用/土地覆盖数据库和本次调查的1999/2000年土地利用/土地覆盖现状数据,利用G IS技术,对两个年份空间数据进行迭加分析。结果显示:在此期间,西部地区耕地面积增加了1 910 727 hm2,同期减少了704 247 hm2,净增加1 206 480 hm2,占总耕地面积的2.41%;西部地区耕地面积增加主要来源于草地开垦,本因子引起耕地增加了129.09万hm2,占总耕地面积增加量的69.45%;大量的草地开垦成耕地,这必将造成土地沙漠化进一步加剧,水土流失更加严重,加之近年来国家政策开始向西部转移,这必将给西部各省的生态带来严峻的考验。
In order to discuss the characteristic and trend of the cultivated land change of every province,municipality directly under the Central Government and Autonomous region of the western part of China in recent years, based on land-utilizing and land-covering data of 1995/1996 year that was offered by Environmental Monitoring General Station of China and of 1999/2000 year that was obtained by investigation,then two years space datum overlapped and analysed by GIS technology. The result shows ：during this period ,the cultivated area of the western region increased by 1 910 727 hm^2,and reduced by 704 247 hm^2in the same term,only increased by 1 206 480 hm^2,accounting for 2% of the total cultivated area;the cultivated area increase of the western region mainly stemmed from the meadow to cultivate which caused the cultivated land to increase by 12 990 000 hm^2,accounting for 69.4% of total cultivated area increase;it will cause land desertification and soil erosion more serious to cultivate large stretch of meadow into cultivated land ,in addition the state policies begin to transform to the western part of China in recent years,which will bring more severe test to ecology of every province in the west.
出处
《水土保持研究》
CSCD
北大核心
2006年第1期170-172,共3页
Research of Soil and Water Conservation
基金
国家环保总局科研项目
编号:J-231-2-05
关键词
耕地
GIS
中国西部
cultivated land
GIS
the western part of China
