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晋西黄土高原区(西山地区),北起天镇,南至乡宁,共32个县(区),总面积7704万亩。农业人口860万,耕地面积1660万亩,占全省耕地面积的28.6%。全区丘陵起伏,水土流失严重,是亟待综合治理的地区。一、晋西黄土高原沟壑区概况全区可分为风沙缓坡丘陵、丘陵沟壑和残垣沟壑三种类型区。海拔400—2700米,年平均气温4—11℃,无霜期100～140天,年平均降雨量450毫米左右。直接流入黄河的有苍头河、三川河、听水河等13条一级支流。据测算,年径流量15亿立方米,水土流
West Shanxi Loess Plateau (Xishan area), north from town, south to the township, a total of 32 counties (districts), with a total area of 77.44 million mu. The agricultural population of 8.6 million, 16.6 million mu of arable land, accounting for 28.6% of the province’s arable land. Undulating hills, serious soil erosion, is the area to be comprehensive management. I. Overview of the Gully Region in the Loess Plateau of Shanxi Province The whole area can be divided into three types of zones: gentle hills with gentle winds, hills and ravines. 400-2700 meters above sea level, the annual average temperature of 4-11 ℃, frost-free period of 100 to 140 days, the average annual rainfall of about 450 mm. Directly into the Yellow River there are Wan River, Sanchuan River, listening to the river and other 13 tributaries. It is estimated that the annual runoff of 1.5 billion cubic meters, soil and water flow