论文部分内容阅读
商城县地处大别山北麓,山区面积占总面积的71.9％,从地形上分南部深山区,中部浅山区,北部丘陵区,大部为片麻岩和花岗岩,岩性极风化,质地疏松。全县多年平均降水量为1181.2毫米,其中暴雨量占70％,降水强度大而集中,加之人为因素的影响,水土流失非常严重。全县有山地水塘21501口,塘灌面积为13万亩,占全县有效灌溉面
Shangcheng County is located in the northern foot of Dabie Mountain. The mountainous area accounts for 71.9% of the total area. The terrain is divided into southern mountainous area, central shallow mountainous area and northern hilly area, mostly gneiss and granite. The lithology is extremely weathered with loose texture. The county average annual rainfall of 1181.2 mm, of which 70% of heavy rainfall, rainfall intensity and concentration, combined with human factors, soil erosion is very serious. The county has 21501 mountain ponds, pond irrigation area of 13 mu, accounting for the county effective irrigation surface