基于MODIS数据研究黄河中上游区域地下水对地表植被影响的方法

摘要

The authors of the paper extracted the normalized difference vegetation index ( NDVI) and the vegetation conditional ratio (VCR) from the MODIS images, and analyzed the relationship among NDVI, VCR and the measured data of groundwater of the same location in the research region. Based on this, the depth of groundwater suitable for vegetation growing in the upper-middle reaches of the Yellow River was calculated. The results showed that the depth of groundwater suitable for vegetation growing in the research region ranges from 0. 8m to 4. 5m, and the most suitable groundwater depth is 1.2m. The method developed in this study is suitable for researching the relationship between large-scale groundwater and land surface vegetation environment in the arid area.%从MODIS影像数据中提取归一化差值植被指数(NDVI)和条件植被覆盖率(VCR),并将其与研究区域内的相同空间位置实测地下水数据进行对比分析,在此基础上对黄河中上游区域适宜于植被生长的地下水位埋深进行了研究.结果表明:研究区适宜于植被生长的地下水位埋深范围为0.8～4.5m,最佳水位是1.2m.在干旱地区,在研究大尺度地下水与地表植被环境关系上,用此研究方法可取得较好的效果.