植株影响下大豆农田土壤水分对降雨的响应模型研究

发布时间：2018-05-13 23:17

本文选题：大豆耕地 + 土壤水分运动　；参考：《应用基础与工程科学学报》2017年02期

【摘要】：为了研究植株影响下大豆农田土壤水分含量对降雨的响应模型,在野外开展对比试验与模型模拟研究.实验设计测定裸土、去除地上茎叶、保留地上茎叶条件下土壤水分湿润峰在降雨过程中的迁移和鼓粒期大豆根系形态.结果表明,研究区单次降雨湿润峰主要集中在015cm土层中,下移深度未触及犁底层.在大豆植株截留传导及根系促进入渗影响下,进行土壤水分研究时,需将大豆耕地土壤水分入渗划分为两个区域,即大豆植株影响区域和无影响区域.垄间区域为无影响区域,土壤水分入渗按照裸土考虑,植株周围及株间不同于垄间为植株影响区域,需要考虑植株截留传导及根系促进入渗的影响.在研究区,采用实测植株周围土壤饱和导水率0.028cm·min~(-1)代替裸土土壤饱和导水率0.021cm·min~(-1)作为模型参数,利用Richard模型进行土壤含水量模拟,3次模拟值与实测值RMSE分别为0.99%、0.94%和1.16%,产流时刻误差0.77、1.12和0.82min,模拟精度较高,说明利用实测植株周围土壤饱和导水率代替裸土土壤饱和导水率,Richard模型可以作为研究区植株影响下大豆农田土壤水分对降雨的响应模型.
[Abstract]:In order to study the response model of soil moisture content of soybean farmland to rainfall under the influence of plant, a comparative experiment and model simulation study were carried out in the field. The experiment design was designed to determine the bare soil, to remove the stem leaves on the ground, and to preserve the migration of soil moisture humidifying peak during rainfall and the root morphology of soybean at grain filling stage. The results show that the wetting peak of single rainfall in the study area is mainly concentrated in the 015cm soil layer, and the depth of moving down does not touch the bottom of the plow. Under the influence of soybean plant retention conduction and root infiltration, soil moisture infiltration in soybean cultivated land should be divided into two regions, that is, soybean plant influence area and no influence area. The region between ridges is unaffected, the soil moisture infiltration is considered as bare soil, and the effect of plant interception and conduction and root system promoting infiltration should be taken into account, which is different from that between plants and ridges. In the study area, the saturated water conductivity (0.028cm minmin-1) of the soil around the plant was used as the model parameter instead of the saturated water conductivity of the bare soil (0.021cm minmin-1). Richard model was used to simulate soil water content for three times. The RMSE of the simulated value and the measured value were 0.994% and 1.16%, respectively, and the error of runoff time was 0.77 ~ 1.12 and 0.82min. the simulation accuracy was high. It is concluded that the Richard model can be used as the response model of soybean farmland soil moisture to rainfall under the influence of plant in the study area.
【作者单位】：东北农业大学水利与土木工程学院;西安理工大学水利与建筑学院;
【基金】：国家自然科学基金项目(51239009,41301288,51479032,51409213) 中国博士后科学基金(2014M561317) 黑龙江省博士后基金(LBH-Z13023) 黑龙江省教育厅科学技术研究项目(12541039) 东北农业大学青年才俊项目(14QC48)
【分类号】：S152.7

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