基于HYDRUS软件的植物混掺土壤水分特征曲线分析

Analysis of soil water characteristic curve by mixed plants based on HYDRUS software

为探求植物混掺对土壤持水性产生的影响,以甘肃景泰地区土壤为试验材料,设置1%玉米芯、1%玉米叶、3%玉米芯、3%玉米叶等不同比例、不同秸秆混掺物4种处理,采用离心机法测定土壤水分特性曲线,同时利用HYDRUS软件进行模拟计算。结果表明,在相同吸力下,相同混掺物处理,混掺比为3%的土壤体积含水率高于混掺比为1%的土壤;相同混掺比处理,混掺玉米叶的土壤体积含水率高于混掺玉米芯的土壤,且混掺处理后土壤体积含水率均高于纯土;不同土壤水分特征曲线的模型拟合分析表明,不同处理的最优拟合模型均为Van Genuchten模型。研究结果可为探索该地区植物混掺条件下土壤水盐运移规律提供一定参考。

In order to explore the effect by mixed plants to soil water holding capacity,we have taken the soil from Jingtai,Gansu for the experimental material,set up four treatments with different plants mixed proportion （such as 1%corn cobs,1%corn leaves,3%corn cobs and 3%corn leaves）,and use the centrifuge method to measure the soil wa-ter characteristic curve .At the same time,utilize the HYDRUS software to simulate and calculate .The results shown that：Under the treatment with same suction and mixed proportion,the soil volumetric water content with mixed propor-tion of 3% was higher than 1% soil;Under the same mixed proportion theatment,the soil volumetric water content mixed corn leaves was higher than mixed corn cobs soil,also the soil volumetric water content with all plants mixed treat-ments were total higher than the pure soil as without any mixed .Though the different model fitting analysis for the soil water characteristic curves,have indicated that the Van Genuchten model was the best fitting model for the four treat-ments .This research results can be provided a certain reference for exploring the rule of soil water and salt movement un-der plants mixed condition in this region .