干旱区枣园土壤水分运动及深层渗漏数值模拟

Numerical Simulation of Soil Water Movement and Deep Seepage of Jujube Orchard in Drought Area

根据TRIME与Hydra土壤水分监测仪监测枣园土壤含水率、TRAC冠层仪测定叶面积指数、Vantagepro2气象站监测气象数据等资料,开展了枣园土壤水渗漏试验。借助HYDRUS-1D模型对枣园传统地面灌条件下的土壤水渗漏规律进行模拟,经检验,模型模拟土壤层20,40,60,80 cm时,土壤含水率模拟值与实测值相关系数分别为0.94,0.94,0.92,0.71。利用模型分析了研究区地面灌条件下的土壤水渗漏特征和田间灌溉水量的转化关系,改进灌溉模式可大幅减少灌溉水量,提高水分的利用效率。

Based on the soil water content data measured by TRIME and Hydra system,the LAI data measured by TRAC,meteorological factors data measured by Vantage pro2 automatic meteorological station and other data,do the experiment of deep percolation,the experiment on soil water seepage is conducted.The soil water seepage rule of a Jujube Orchard under traditional surface irrigation is simulated with the HYDRUS-1D model,and the results were verified by the measurement of soil water content.The result shows that the correlation coefficient is 0.94,0.94,0.92,0.71,respectively,between the value of simulation and measurement of soil water content at 20,40,60,80cm in the soil profile.The characteristic of deep seepage and the distribution of irrigation water under the surface irrigation were analyzed,and the results show that the modified irrigation pattern can save irrigation water largely and improve the of water use efficiency.