Yanhe River basin 延河流域
Yanhe River watershed, and show nearly East-West from the integration of areas in the central passage.
南河与秀延河分水岭近东西向从整合区中部通过。
From the space distribution, potential vegetation biomass is higher than the reality of vegetation in the southeast of Yanhe River catchment, vegetation have better growth potential;
从空间分布上，流域东南部的大部分地区，植被潜在生物量高于现实生物量，植被有较好的生长潜力；
With the increase of petroleum resource exploitation in Northern Shaanxi during recent decades, the quality of surface water of Yanhe River and Qingjianhe River is affected seriously.
近几十年来陕北地区油气大规模的开采，对延河和清涧河流域地表水水质状况造成严重影响。
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