基于GIS的宁夏引黄灌区中低产田遥感调查

采用GIS技术,以法国SPOT5号卫星高分辨率遥感影像为基础,应用“综合分析,主导因素判定”、室内解译、专家审核、实地抽样校核的调查方法,对宁夏引黄灌区中低产田进行遥感调查,结果表明:灌区高中产田的面积与历史数据比较有所增加,尤其中产田面积增加较大,低产田减少幅度较大,说明近年来灌区耕地总体质量趋于好转.这与灌区土壤盐渍化总体减轻、土壤有机质含量整体增长、粮食产量逐年增长的调查结果相一致.

The remote sensing investigation of medium fertile and poor farmland by means of GIS in the irrigation area of Ningxia

On the basis of high-resolution remote sensing images from France SPOT5 satellite,by applying the methods of "synthetic analysis and determination with leading factors",interpretation indoor,verification by experts from the divisions and counties and proofreading with samples on the spots,the medium and low yield farmlands in Ningxia were investigated by means of GIS.The result showed that the area of high and medium yield farmlands in the irrigated area was increased compared with the historical data,in which the area of medium yield farmlands scale was greatly increased especially.The area of low yield farmland was greatly reduced.All of those indicated that the quality of cultivated lands in the irrigated area was improving these years,which accorded with the whole decrease of salinization,the whole increase of organic matter in the soil and the growth of grain yield year by year.