Studies on the changes of base flow in Qiushui river watershed
ran da chuan 1; 2 ; liu bin 1; kou quan 1 (1.xifeng experiment station of soil and water conservation; yrcc; xifeng; gansu 745000; china; 2.institute of soil and water conservation; chinese academy of sciences and ministry of water resources; yangling; shaanxi 712100; china)
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