论文部分内容阅读
豫东豫北平原地区約四千余万亩耕地,为华北黃河冲积平原的一部分,位于西南边緣,大部是浅色草甸土,土壤形成过程受地下水影响較大,地面极为平坦,一般坡度在1/3,000—1/5,000,中区地形为河床高超崗地及浅槽形凹地。地下水质較好,上层潜水90％以上,矿化度小于2.5克/升,由于土壤受地下水影响及气候的春早秋涝,常常产生季节性脫盐及返盐过程。黄河在这一平原中多次泛滥沉积,因此土壤质地較下游粗而松,在平原中各河流多受黄河淤积影响,形成河床填高,排水不暢,地下水少出路,尤
About 4 million mu of arable land in the Yubei Plain of eastern Henan is a part of the Yellow River alluvial plain in North China. It is located on the southwestern margin and most of it is a light-colored meadow soil. The soil formation process is greatly influenced by groundwater and the ground is extremely flat The slope is in the range of 1 / 3,000-1 / 5,000. The terrain of the Central District is a high-lying riverbed and shallow trough-shaped depression. Groundwater quality is good, the upper diving more than 90%, the salinity of less than 2.5 g / L, due to the impact of groundwater by the spring and early autumn climate, often have seasonal desalination and salt return process. The Yellow River in this plain flooding sediment many times, so the soil texture is more coarse and loose downstream, in the plains of the rivers affected by the Yellow River deposition, the formation of river bed filled, poor drainage, groundwater less out of the way, especially