【摘要】 应用非饱和土壤水运动理论,建立膜下滴灌条件下土壤水分运动二维数值模拟模型,研究了田间层状土壤在膜下滴灌条件下土壤水分运动特征。应用不同小区不同灌水处理的实测值与模拟值进行验证,同时对模型做了精度分析,结果表明符合精度要求,这说明所建立的模型能客观地反映实际土壤条件下的水分运动情况。研究结果表明:土壤剖面30～40 cm粘土层使土壤水分运动具有很大的差异,0～30 cm变化明显,而40 cm以下土壤水分运动的变化较小。膜下滴灌应该采取灌水量小,频度大的灌溉模式。更多还原

【Abstract】 Based on the theory of unsaturated dynamic,a two-dimensional vertical plane model was developed to nu- merical simulate soil water movement of drip irrigation under mulch by Hydrus-2D.The soil water movement of strat- ified soil in the experimental plot was calculated in the condition of drip irrigation under mulch.The field test was carried out in Aksu Water Balance Experiment Station.Verifying the numerical simulation results with both under and between mulch the water content of soil profile in different test field with different irrigation treatment,it indicated that they have better conformity.Besides,comparing the soil water content of 0-10 cm deep in different time and different location observed by PTM-48 (Photosynthesis Transpiration Monitor) with numerical simulation results,the numerical simulation results are less than the values of field tests,but the changing tendency was agreeable.SO the numerical simulation model of soil water movement in the condition of drip irrigation under mulch is acceptable.From the results of experiment,the soil movement has explicit difference,because of the clay stratification in 30-40 cm. The obvious difference can be seen from 0-30 cm of soil profile,but there is no sharp change below the 40 cm.The water use efficiency can be upgraded by reduceing the irrigation requirement and adding irrigation frequency.更多还原