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安河乡位于延長城东北50余公里处,屬黄土丘陵溝壑区,地形破阵,溝壑縱横,土壤侵蝕極为严重。安河乡沿黄河一帶,由于位居延河和其他一些大溝道的下游,水大流急,土壤侵蝕尤为严重,地表黄土層已侵触殆尽,到处都出现了紅土層,溝壑密度每平方公里3.1公里,干溝石溝床下切达到百余公尺。由于水土流失的結果,土壤贫瘠,植被缺乏,坡耕地的产量極低;丰收年成,亩产下过40余斤,歉收年成,严
Anhe Township is located more than 50 kilometers northeast of the extension of the city, is a loess hill and gully area, terrain burst, ravines aspect, soil erosion is extremely serious. Anhe Township along the Yellow River, due to Yanhe River and other major channel downstream, the water is very rapids, soil erosion is particularly serious, the surface loess layer has been invaded, there are red soil layer everywhere, gully density 3.1 kilometers per square kilometer , Dry ditch ditch cut bed to reach more than 100 meters. Due to the result of soil and water loss, the soil is barren and the vegetation is lacking. The output of slope farmland is extremely low.