青海湖流域50年来(1956-2007年)河川径流量变化趋势——以布哈河和沙柳河为例
청해호류역50년래(1956-2007년)하천경류량변화추세——이포합하화사류하위례
Trend of streamflow in Lake Qinghai basin during the past 50 years(1956-2007)-Take Buha River and Shaliu River for examples
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