论文部分内容阅读
一、流域简况 七峪水库流域内30％是以花岗岩为主的深山,10％为砂砾沉积岩,土层很薄,坡面多为荒山,60％为第三纪红色砂岩。这里深山以生长松、橡为主,坡面以刺槐为主,山沟内为第四纪松、散地层所分布,表层以粘土和壤土为主,是流域内的粮、棉、油产区。流域面积5.1万亩,耕地6235亩,其中水平耕地2631亩。这里水土流失面积约4万亩,占流域面积的78％,
I. Introduction to the Basin 30% of the Qiyu Reservoir Basin is dominated by granite and 10% is gravel sedimentary rocks. The soil layer is very thin with mostly barren hills and 60% Tertiary red sandstone. The mountains here are mainly pine and oak. The slopes are dominated by black locusts. Quaternary pine and scattered strata within the ravines are mainly distributed in the mountains. Clay and loamy soil are the main components in the mountainous areas. Watershed area of 51000 acres, 6235 acres of arable land, of which 2631 acres of cultivated land level. Soil erosion area of about 4 million mu, accounting for 78% of the basin area,