【摘要】 以黄土高原中部泾河及其7个子流域为研究对象,选取了流域内8个水文站33年的径流量和输沙量以及30年的降水量数据,同时对2002年的M OD IS数据进行分类处理,分析了不同流域的水沙变化差异及其地表覆被类型特征。结果表明:泾河流域近50年来的输沙量略有下降,而径流量减少比较显著;泾河及其7个子流域的水沙变化和9种地表覆盖类型空间格局的差异显著;地表植被类型较好的流域,径流量相对较大而输沙量相对较小,且径流量与输沙量的起伏波动较小,反之则流域的径流量相对较小而输沙量相对较大,且径流量与输沙量的变化明显。更多还原

【Abstract】 The study area was selected Jinghe and its 7 subwatersheds in the middle of Loess Plateau.Using the runoff and sediment data of 8 hydrological stations from 1971～2003 and the precipitation data in this area from 1971～2000,classified MODIS data of 2002,all of these were analyzed runoff and sediment variation of watersheds and its land cover feature.Results show that sediment yield decrease slightly but runoff yield increase obviously of Jinghe watershed nearly 50 years;The visible difference of runoff yield and sediment yield and land cover pattern were found in this area;The better land cover of watershed has higher runoff yield and lower sediment yield,and fluctuant small of runoff yield and sediment yield;Contrarily,the worse land cover of watershed has lower runoff yield and higher sediment yield,and fluctuant large of runoff yield and sediment yield.更多还原