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浑椿河小流域,位于豫西伏牛山区,属淮河水系,北汝河的一条支流,涉及汝阳县的十八盘和三屯两个乡,总面积43.58平方公里,总人口4492人,人均占有土地14.6亩。在治理前,水土流失十分严重,每平方公里土壤流失量达4000～6000吨;土壤瘠薄,活土层厚度一般仅30厘米左右,山坡上甚至只有10～20厘米,主要耕种土壤石碴褐土的有机质含量不足2％,全氮含量0.02～0.1％,速效磷4～5ppm;植
Hunchun small watershed, located in the Funiu Mountain in western Henan, is a Huaihe River, a tributary of the North Ru River, involving the Panchuan Ruyang County and Sandton two townships, with a total area of 43.58 square kilometers, with a total population of 4492 people, the average per capita Occupies 14.6 acres of land. Before the treatment, the soil and water loss was very serious with soil loss amounting to 4,000 to 6,000 tons per square kilometer. The soil was infertile, the thickness of living soil layer was only about 30 centimeters, and even the hillside was only 10 to 20 centimeters. The main cultivated soil was stone ballast Less than 2% organic matter content, total nitrogen content of 0.02 ~ 0.1%, available phosphorus 4 ~ 5ppm;