基于HYDRUS-2D模型膜下滴灌棉田不同上口宽排盐浅沟下土壤水盐运移模拟

Simulation of soil water and salt transport in different upper wide shallow ditch in drip irrigation cotton field in HYDRUS-2D model

本文以膜下滴灌棉田土壤水盐运移为研究对象,根据室内试验参数及田间测坑试验在HYDRUS-2D中建立模型,利用实测值与模型模拟值进行对比,调整模型参数,确定建立模型的准确性。根据已有的模型,对不同上口宽排盐浅沟的排盐问题进行研究,研究生育期膜下滴灌棉田不同深度盐分和水分的变化情况,分析模拟结果对比不同排盐沟的上口宽对土壤排盐效果的影响。为合理制定土壤排盐模式,减少和改良土壤次生盐渍化提供科学的理论依据。

The soil water and salt transport in drip irrigation cotton field under plastic film was taken for the research.The HYDRUS-2D model was established basis on the field experiment.The measured values were compared with the simulated values of the model,and the model parameters were adjusted.Determine the accuracy of modeling.According to the existing models,the problem of salt discharge in shallow ditch with different upper mouth width was studied,and the changes of salt and water content in different depths of drip irrigation cotton field under plastic film during the cultivation period were studied.The effects of upper mouth width of different salt discharge ditch on soil salt removal efficiency were analyzed and compared.It provides a scientific theoretical basis for reasonably formulating the model of soil salt discharge and reducing and improving soil secondary salinization.