摘要
松嫩平原沙地主要分布于松嫩平原的中西部地区,包括松嫩沙地和科尔沁沙地的一部分.沙地分布区处于半干旱地区,年降水量在350～450mm,是松嫩平原生态环境变化的敏感地区.采用RS和GIS集成技术,对松嫩平原1986年和2001年的沙地进行遥感解译,结合野外调查,研究松嫩平原沙地分布的现状及其动态变化.结果表明,松嫩平原土地沙化有进一步发展的趋势,2001年沙地面积比1986年增加了861.1km2,沙地平均每年以0.44%的速度扩展.其中,重度沙地变化率最大,中度沙地面积数量增加最多,轻度沙地略有减少.
The desertified lands in Songnen plain are distributed mainly in the center and west of the plain, including the Songnen desert land and a part of Horqin desert land. The desertification is located in the semiarid area, where the annual precipitation is 350 - 450 mm, with sensitive ecologic environment. The desertifieation of Songnen plain in both 1986 and 2001 are interpreted by RS and GIS technique. Combined with field investigation, the current situation and changing trend of the desertifieation is studied. The result reveals that the desertification in Songnen plain is in a developing trend. From 1986 to 2001, the area of desertified land increased 861.1 km2, in an expanding rate of 0.44% annually. The heavily desertified land changed in the greatest expanding rate. The area of moderate desertified land increased the most; while that of the lightly desertified land decreased a little.
出处
《地质与资源》
CAS
2008年第3期202-207,234,共7页
Geology and Resources
基金
中国地质调查局"松嫩平原地下水资源及其环境问题调查评价"项目(编号1212010430352)资助.
关键词
松嫩平原
土地沙化
动态变化
Songnen plain
desertification
changing trend
