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论文类型：会议论文

发表时间：2013-09-21

收录刊物：EI、CPCI-S、Scopus

卷号：448-453

页面范围：1158-1164

关键字：Deep percolation; Maize; Irrigation; Numerical simulation; Water balance

摘要：The rules of deep percolation produced by irrigation under maize in the field with greater depth of groundwater are studied. With the maize cultivation in Dalian as an example, 1-D finite element model is built by VADOSE/W using the daily meteorological data in the years with guaranteed rainfall frequency of 75%, 50% and 25% through analyzing the years-long period regional meteorological data. By this model, the field soil water flow in a whole year under the rain-fed, sprinkler irrigation and border irrigation is simulated respectively, and the water balance of 1m-deep root zone is analyzed. The simulation shows that the ratio of deep percolation to the sum of net precipitation and net irrigation water amount is less than 5% under the rain-fed, 5%similar to 9% under the sprinkler irrigation, 7%similar to 13% under the border irrigation respectively. 70%similar to 95% of deep percolation is produced by irrigation and about 13%similar to 28% of net irrigation water amount is lost as deep percolation, as a result, the main reason for deep percolation can be concluded as irrigation in fields.