【摘要】 我国南方多采用水稻与冬小麦连作的耕作模式 .由于小麦生长期降雨量较多 ,地下水位过高 ,作物易受渍害 .水稻长期淹灌 ,土壤通气状况不良 ,易造成作物减产 .为此 ,都需要修建排水系统 .但排水的同时也增加了化肥的流失 ,污染河湖水体 ,对水环境造成危害 .为了使排水系统能同时满足作物增主和防止化肥流失对环境影响的要求 ,本文着重探讨了水旱连作条件下 ,同时考虑农田水分状况和排水水质的排水设计标准及排水规格的确定方法和步骤更多还原

【Abstract】 The methods for determining the drainage design criteria to meet the requirements of crop yield increase and environment protection, under the condition of planting paddy after winter wheat, are investigated. In this cropping pattern, winter wheat always suffers from water logging due to excessive rainfall and rise of groundwater in growth period. During the growth period of paddy, the unfavorable condition for soil aeration due to long term submergence of ponding irrigation causes the reduction of yield of paddy rice. However drainage system will increase the loss of fertilizer and contaminate the water in rivers and lakes. Thus, reasonable drainage criteria are needed.更多还原