新疆干旱区土地盐渍化信息提取及实证分析

对提取干旱区盐渍化信息的若干方法进行了评述,并且选取位于干旱区地带的盐渍化典型区域——阿克苏地区的库车、新和、沙雅县以及和田地区的于田县作为研究区进行实证分析。并采用同一时相的ETM+数据,运用K-T变换、比值变换以及通过NDVI指数和分类来提取信息发现效果明显。通过实证分析发现:虽然研究区都地处塔里木盆地周边地区,一个是塔北绿洲,另一个是塔南绿洲。但由于水文(盐渍化形成的关键)、气候(形成盐渍化土壤的驱动力)、地形(盐渍化土壤分布及差异的主要因素)、人类活动(盐渍化土壤形成的重要因素)等因素差异的存在,导致了盐渍化情况的差异。

Selected Methods and Empirical Analysis of Extracting Salinization Information in the Arid Area of Xinjiang

Salinization of soil is a serious problem in arid and semi-arid regions where irrigation is practiced,and thus it damages the whole ecosystem seriously.It is reported that about 10% of presently arable lands of the world are affected by salinity,so it is necessary to study salinization in the arid area in order to prevent further deterioration of the salt-affected soils.This paper reviews several methods of extracting salinization information in the arid area,and then the study was conducted in Kucha,Tohsu,and Shaya county of Aksu region,as well as Keria county of Hotan in the Taklamakan desert in Xinjiang Province,China.The methods of extracting salinzation used are called Kauth-Thomas(K-T) transformation,ratio transformation and through Normalized difference vegetation index(NDVI) and classification by using the temporal ETM data.The results indicated that although the studied sites are around the Tarim basin Peripheral zone,one is in the north of oasis and another is in the south of the oasis,the differences of salinity in the studied areas around the Takalmakan Desert were due to differences in local of hydrology,climate,terrain,and human activity.