摘要
利用９０年代１２５万和１５０万的ＴＭ遥感影像及ＧＩＳ获得的数据，结合该区７０、８０年代遥感调查数据，分析了科尔沁地区６个县的土地覆盖类型和潜在沙漠化动态及敏感因子．结果表明，１９８０～１９９０年该区的沙化面积从５３％扩大到７０％，林地下降１０．７％，草地增加８．３８％，主要为低覆盖草地．由于１０年来人口密度增加了１０人·ｋｍ－２，耕地平均增加了７％，人口增加和活动是土地覆盖变化的敏感性因子．分析该区沙漠化的自然因素表明气候变化导致沙漠化的正逆过程，人类活动是近代该区沙漠化加剧的直接原因．灰色预测表明该地区２０００年以后人口增加。
Using remote sensing pictures
acquired by Landsat TM1250 000 and 1500000 in 1990s and GIS data,combining with the
results of remote sensing investigation from 1970s to 1980s, the types of land cover,potential
dynamics of desertification and sensitive factors in six counties of Kerqin sandy land were
analyzed.From 1980s to 1990s.the desertification area in the region increased from 53% to
70%,forested land decreased by 10.7%,and grassland area increased by 8.38%,with a major
increase of lowly covered land.Due to the increase of human population density by 10
persons·km -2 in recent ten years,the cultivated land was increased by 7% on
average.Population increase and human activities were the sensitive factors affecting the
change of land cover.The analysis of natural factors influencing desertification shows that
climate change might result in the processing of desertification,and human activity is the direct
cause aggravating the desertification of Kerqin sandy land at modern time.The grey forecast
shows that the human population would increase,and the desertification tended to increase or
decrease after the year of 2000.
出处
《应用生态学报》
CAS
CSCD
1999年第2期163-166,共4页
Chinese Journal of Applied Ecology
基金
中国科学院"八五"重大资助项目
关键词
遥感
科尔沁
沙地
沙漠化
灰色预测
人类活动
Remote sensing, GIS, Kerqin sandy land,
Desertification, Grey forecast
