裸露的第三纪红土,在晋西黄土丘陵沟壑区占有一定面积,据离石王家沟流域调查,红土坡占总面积的9.92%,多分布在沟谷底部与沟掌。这些荒坡的地面坡度多在30°～45°之间,由于红土坡的土壤物理性极差,肥力瘠薄,几乎不能种植农作物,林草生长也极少,复盖度一般只有5～15%。为 Exposed third-period laterite, in the western Shanxi loess hilly and gully area occupies a certain area, according to Lishi Wangjiagou watershed survey, the red earth slope accounted for 9.92% of the total area, mostly in the valley bottom and ditch palm. The slopes of these barren slopes are mostly between 30 ° and 45 °. Due to the extremely poor soil physical properties and poor fertility on the red soil slopes, almost no crops can be planted and forest and grass growth is extremely rare. The coverage is only 5-15% . for