摘要
以重庆南川区为例,利用TM遥感影像、Arcgis和Erdas软件,运用地图代数原理,采用图像数据转移矩阵计算,结果表明从1988年到2000年水土流失增强面积为9605.89 hm^2,减弱面积为79947.85 hm^2;石漠化强度增强面积为15078.92 hm^2,减弱面积为12492.53 hm^2。石漠化是水土流失长期作用的结果,水土流失是石漠化形成过程的阶段性表现,二者在成因上存在因果关系,但在生态治理恢复的过程中,水土流失减弱面积与石漠化减弱面积的变化不同步,在时间上存在滞后关系。造成这种滞后的现象,原因是石漠化土地生态的恢复过程较水土流失土地的长。
The paper takes Nanchuan in Chongqing as an example and obtains change relationship between soil erosion intensity and rocky desertification via TM remote sensing image and Arcgis as well as Erdas software on the basis of map algebra principle to transfer matrix of image data. The results show that the increased area of soil erosion is 9 605.89 hm2 and the decreased area is 79 947.85 hm2 from 1988 to 2000 while the increased area of rocky desertification is 15 078.92 hm2 and the decreased area is 12 492.53 hm2. Rocky desertification is a result of long-term effect of soil erosion and soil erosion is the stage of rocky desertification, i.e. there is causal relationship between them. But the area of rocky desertification lightening lags that of soil erosion. The reason for the lag is that the time for ecological restoration of the rocky desertification is longer than that for soil erosion.
出处
《中国岩溶》
CAS
CSCD
2010年第1期20-26,共7页
Carsologica Sinica
基金
科技部国际合作项目(2008GR1256)
国家科技支撑计划课题(2006BAC01A16)
国家自然科学基金(40801077)
重庆市科委项目(2007BC7001
CSTC2009BA0002)
西南大学研究生创新基金项目(kb2009004
ky2008001)
关键词
水土流失
石漠化
岩溶区
重庆南川区
soil erosion
rocky desertification
karst region
Nanchuan karst area in Chongqing
