摘要
利用1975年MSS、2000年ETM+和2007年CBERS-02B共3期影像数据开展三江源地区土地沙化遥感调查监测,在此基础上重点分析了32 a来三江源地区土地沙化时空变化特征及其驱动力因素。三江源土地沙化总体表现为先增加后减少的过程,沙化土地主要分布于海拔相对较高的平缓高原面上的盆地内,且具有沿河、沿交通线分布的特点。2000年以前,气候暖干化和人为活动加剧造成了土地沙化日益严重,表现为总量在增加、程度在加重、空间分布变化频繁;2000年以后,气候暖湿化是土地沙化趋于改善的最主要因素。
Based on the MSS （ 1975 ）, ETM ^＋ （2000） and CBERS - 02b （2007） images, the authors conducted monitoring of land desertification in Sanjiangyuan region with the emphasis placed on the characteristics and driving force of land desertification variation. Desertification land is mainly distributed in the flat plateau, close to the river and roads. The area of desertification land increased obviously between 1975 and 2000, especially in the Yellow River headwaters area, because of the warming and drying as well as the disturbance of human activities such as panning and overgrazing. In addition to the increasing desertification area, the degrading level was aggravated and the changes in spatial distribution were frequent. After 2000, the Sanjiangyuan Reserve Area was set up with the purpose of reducing the impact of human activities as much as possible. On the other hand, the precipitation was increasing. Since then, land desertification in Sanjiangyuan region has tended to be improved.
出处
《国土资源遥感》
CSCD
2010年第B11期72-76,共5页
Remote Sensing for Land & Resources
关键词
土地沙化
气候变化
遥感
三江源
Land desertification
Climate change
Remote sensing
Sanjiangyuan region
