不同土质的浅层土壤水盐运移规律模拟——以内蒙古解放闸灌域为例

Simulation of Water and Salt Transport in Shallow Soil with Different Soil Quality:A Case Study of Jiefangzha Irrigation Area of Inner Mongolia

为了研究不同土质的浅层土壤水盐运移规律,以玉米田间试验为基础,运用一维饱和-非饱和土壤水分及溶质运动理论,对比分析了模拟值与实测值,验证了HYDRUS-1D数值模型的模拟精度,并模拟了内蒙古解放闸灌域4种不同土质的土壤水盐运移,确定了不同灌水定额下不同土壤的水盐动态。结果表明:不同土质下0～10与10～20 cm土壤体积含水量变化基本一致,且土壤含水量随着灌水定额的增大而增大;同等条件下粉砂质黏壤土含水量高于壤土、黏壤土、壤质黏土的含水量;灌水定额越大,粉砂质黏壤土与壤质黏土中的盐分随着水分运动表现的降低效果明显,说明增加适量灌水定额后粉砂质黏壤土与壤质黏土有利于玉米生育生长。利用HYDRUS-1D模型对土壤水盐运移的模拟结果能够为灌域的水盐管理和土壤盐渍化治理提供参考依据。

In order to study the law of water and salt transport in shallow soil under different soil conditions,based on maize field experiment,using one-dimensional saturated-unsaturated soil moisture and solute movement theory,the simulated values and measured values were compared and analyzed,and the simulation accuracy of HYDRUS-1 D numerical model was verified. Four different soils in Jiefangzha irrigation area of Inner Mongolia were simulated. The movement of soil water and salt was determined,and the water and salt dynamics of different soils under different irrigation quota were determined. The results showed that the volume water content of 0 ~ 10 cm and10 ~ 20 cm soils under different soil conditions was basically the same,and the soil water content increased with the increase of irrigation quota;the water content of silty clay loam was higher than that of loam,clay loam and loam clay under the same conditions;the larger irrigation quota,the more water the silty clay loam and loam clay contained,which indicated that silty clay loam and loamy clay were beneficial to the growth and development of maize. The simulation results of soil water and salt transport using HYDRUS-1 D model can provide reference for water and salt management and soil salinization control in irrigation area.