论文部分内容阅读
1.农田排水农田排水是改善农业生产条件,提高农作物产量的主要措施之一。在湿润或半湿润地区,因降雨过多或过于集中,造成地面积水,地下水位过高和土壤水分过多,容易导致涝、渍灾害。在干旱和半干旱地区,在发展灌溉的同时,要健全排水系统,控制地下水位,防止土壤盐碱化。目前农田内部的排水方式有明沟、暗管和竖井等几种。农田排水标准有治涝标准、排渍标准和防盐标准。排涝标准以排除某一可能发生的暴雨径流,而不造成作物显著减产为标准。一般采用3-5年或5-10年一遇的暴雨量作为指标。
1. Drainage of farmland Drainage of farmland is one of the main measures to improve agricultural production conditions and increase crop yields. In humid or semi-humid areas, due to excessive rainfall or too concentrated, resulting in surface water, groundwater level is too high and the soil is too much water, easily lead to waterlogging, disaster. In arid and semi-arid areas, while developing irrigation, it is necessary to improve drainage systems, control groundwater levels and prevent soil salinization. Drainage within the current farmland are open ditch, underground pipe and shaft several. Drainage standards for farmland waterlogging standards, drainage standards and standards of salt. Water drainage standards exclude a possible storm runoff without causing significant crop yields. Generally 3-5 years or 5-10 years of heavy rainfall as an indicator.