应用MODIS数据进行土壤盐渍化评价方法研究  

Assessment of Soil Salinization Using MODIS Data

作　　者：陈康[1] 金晓媚[1] 万力[1] 马丽莎[2] 

机构地区：[1]中国地质大学(北京)水资源与环境学院,北京100083 [2]中国地质科学院水文地质环境地质研究所,石家庄050061

出　　处：《科技导报》2009年第14期59-63,共5页Science & Technology Review

基　　金：国家自然科学基金项目(40772158)

摘　　要：土壤盐渍化是土地荒漠化的主要成因和表现形式,是一个世界性的资源问题和生态问题,给人类社会带来了严重的经济损失和生态危害。探讨了利用中分辨率遥感数据,对区域性盐渍化土壤进行分类评价的方法。以银川平原为例,选用分辨率为500m的MODIS遥感影像数据,运用非监督图像分类方法中的ISODATA算法,对该区域的土壤盐渍化程度和分布状况进行定性和定量的评价分析。分析结果表明,在银川平原区内,非盐渍化土面积约4088.50km2,重度盐渍化土面积约170.00km2,中度盐渍化土面积约659.00km2,轻度盐渍化土面积约1653.50km2。与实际调查资料对比,得出本次分类结果精确度为77.6%。Soil salinization is a worldwide issue of resources and ecology. It causes serious economic losses and ecological hazard for the society. The desertification caused by salinization is become the main genesis and format of the desertification. The method of assessment of regional soil salinization based on mid-resolution remote sensing data was discussed in this paper. The situation of soil salinization in Yinchuan Plain located in the northern part of Ningxia Province is very typical. The Yinchuan Plain was taken as an example. Based on the MODIS data with 500 m spatial resolution, the qualitative and quantitative distribution of the soil salinization was analyzed by using ISODATA of unsupervised classification in this study. The result of qualitative analysis showed that Yinchuan City is the dividing line of the degree of soil salinization in Yinchuan Plain areas. North of Yinehuan City, the degree of soil salinization is mainly serious and moderate. And south of Yinchuan City, the degree of soil salinization is principally light. The quantitative result indicated that the unsalinization area is about 4 088.50 km^2, the serious salinization area is 170.00 km^2, the moderate salinization area is 659.00 km^2 and the light salinization area is 1 653.50 km^2. Field sampling data were used to check accuracy. The results showed that the overall accuracy of remote sensing in detecting soil salinity was 77.6%. The results were satisfactory. The method can be used in the initial macro-survey research to grasp the salinization situation of the study area.

关 键 词：MODIS遥感数据 土壤盐渍化 ISODATA算法 

分 类 号：X825[环境科学与工程—环境工程]