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栖霞县地处胶东半岛,是一个低山区,121万多亩耕地中,60％以上分布在3°以上的坡面上。土壤以石碴土为主,遍布全县23个乡、镇,共有70.38万亩,占耕地面积的58％,其母质为花岗岩、片麻岩及其它结晶杂岩经长期侵蚀以后的残积物,因此,粗骨砾含量大,蓄水保肥能力低。全县多年平均降雨750mm,70％分布在7～9三个月,形成春旱、秋涝、晚秋旱,干旱是这个县的主要灾害。 据水土保持普查资料,该县坡耕地多年平均侵蚀深在4mm左右。水土流失带走了大
Qixia County, located in the Jiaodong Peninsula, is a low mountainous area with more than 60% of the over 1,200 mu of arable land distributed over a slope of 3 ° or above. The soil is dominated by ballast soil, which covers 23 counties and towns in the whole county with a total area of 703,800 mu, accounting for 58% of the cultivated land area. Its parent material is residual after long-term erosion of granite, gneiss and other crystalline complexes, Therefore, the coarse boulder content, low water storage and fertilizer. The county average annual rainfall of 750mm, 70% distributed in 7 to 9 months, the formation of spring drought, autumn floods, late autumn drought, drought is the county’s main disaster. According to the Census of Soil and Water Conservation data, the average erosion rate of slope farmland in the county is about 4mm deep. Soil and water loss took away