摘要
为了了解银川平原土壤盐渍化动态变化特征,更好地保护该地区生态环境,对其土地盐渍化进行动态监测研究。在分析和处理2000年和2005年2个时期的TM遥感图像后,通过缨帽变换与RVI方法,结合GIS有效地提取银川平原土壤盐渍化信息,并对其数量变化、空间变化特征进行了分析。结果表明,20世纪70～80年代盐渍化程度减轻,80年代后期有所增加,90年代盐渍化程度减轻;银川北部地区主要表现为耕地面积增加,非盐渍化耕地面积增多,盐渍化耕地面积减少,盐碱荒地面积减少,耕地盐渍化程度减轻;银川南部地区土壤盐渍化程度明显减轻。
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.
出处
《现代农业科技》
2009年第23期312-314,317,共4页
Modern Agricultural Science and Technology
基金
北京农学院三项基金项目
关键词
遥感
土地盐渍化
动态监测
宁夏银川
remote sensing
land salinization
dynamic monitoring
Yinchuan Ningxia
