Yanhe spring karst water system is one of the famous springs in North China.

山西省延河泉岩溶水系统是我国北方岩溶大泉之一。

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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。

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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；

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