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以黄河中游多沙粗沙区皇甫川、孤山川、窟野河、秃尾河和佳芦河5条重点支流为研究对象,以1998年、2009年2期同一时相的TM影像为数据源,以归一化植被指数(NDVI)和植被覆盖度遥感定量模型为基础,提取2期植被覆盖等级,定量分析了该地区植被覆盖度的变化情况。结果表明:通过近10 a来的综合治理,2009年5条流域整体植被覆盖度提高,除皇甫川外,其他4条支流的中下游地区植被覆盖度明显提高。从植被覆盖的等级变化来说,1998年主要的植被覆盖度为0～10%和10%～30%这2个等级,2009年主要集中在10%～30%和30%～50%这2个等级,植被覆盖状况已向良好转变。
Taking the five major tributaries of Huangfuchuan, Gushanchuan, Kuye River, Tuwei River and Jialu River in the middle and middle reaches of the Yellow River as the research objects, the TM images of the same time phase in 1998 and 2009 are taken as data sources, Based on the normalized vegetation index (NDVI) and the remote sensing quantitative model of vegetation coverage, the vegetation cover of the second stage was extracted and the variation of vegetation coverage in the area was quantitatively analyzed. The results showed that the overall vegetation coverage of the five basins increased in 2009 through comprehensive management in the past 10 years. The vegetation coverage of the middle and lower reaches of the other four tributaries except for Huangfu River was significantly increased. In terms of the change of vegetation coverage, the main vegetation coverage in 1998 was 0-10% and 10% -30%. In 2009, the main vegetation coverage was 10% -30% and 30% -50% A grade, vegetation cover has been a good change.