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Indexed by:会议论文

Date of Publication:2013-09-21

Included Journals:EI、CPCI-S、Scopus

Volume:448-453

Page Number:1158-1164

Key Words:Deep percolation; Maize; Irrigation; Numerical simulation; Water balance

Abstract: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.