Dynamic Monitoring of Land Salinization in Yinchuan Based on Remote Sensing

In order to understamd the dynamic characteristic of soil salinity changes in Yinchuan Plain,and to preserve the ecological environment,dynamic monitoring was carried out.After analyzing and processing 2 temporal remote sensing images in 2000 and 2005,the salinization information of Yinchuan was effectively extracted by using Tassehed-cap transformation and RVI method combining GIS.Its quantity changes and the spatial variation characteristics were analyzed.The results showed that the salinization degree was decreased during 1970s to 1980s,increased in late 1980s,and decteased in 1990s.In the northern region of Yinchuan,the total area of arable land was increased,non-salinization arable land was increased,salinization arable land and saline wasteland were decreased,and the salinization degree of arable land was decreased.In the southern region,the salinization degree of arable land was significantly decreased.