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1 流域概况张南沟小流域位于河南省淅川县西簧乡西北部,距县城40km,属丹江水系淇河的一级支流,流域内有2个行政村,12个村民小组,473户,1851人。总面积9.44km~2,其中,耕地185.8hm~2,人均耕地0.1hm~2,人口密度196人/km~2。该流域属低山区,海拔高程在220～850m之间。地质以石灰岩为主,有部分片麻岸,山高坡陡,平均坡度20°,荒山荒坡面积大,土壤疏松、植被稀疏,抗冲力差,年降雨量
1 Basin Profile Zhangnangou small watershed is located in Xichuan County, Xichuan County, Henan Province, northwest of the county, 40km from the county, is a tributary of the Danjiang River Qi River, the basin has two administrative villages, 12 villagers group, 473 households, 1851 people. The total area is 9.44km ~ 2, of which cultivated land is 185.8hm ~ 2, per capita arable land is 0.1hm ~ 2, and population density is 196 persons / km ~ 2. The basin is a low mountain area, elevation elevation of 220 ~ 850m. The geology is mainly limestones, with some flax banks, steep mountain slopes and average slope of 20 °. The area of barren mountain slopes is large with loose soil, sparse vegetation, poor impact resistance and annual rainfall