基于HYDRUS模型的盐碱地土壤水盐运移模拟

The simulation of water and salt transportation by HYDRUS model in Lubotan of Shaanxi,China

为了解陕西卤泊滩盐碱地的水盐运移情况,基于当地2009—2013年田间水盐监测资料,应用饱和-非饱和土壤水分及溶质运移理论,利用HYDRUS-1D数值模型对当地土壤水分、盐分运移规律进行数值模拟,分析了盐碱地的水盐变化状况,确定合理的田间灌水定额。结果表明:在玉米整个生育期内,不同灌溉处理的土壤含水量变化趋势基本一致,从节水控盐的综合标准衡量,农田灌水定额为500 m3·hm-2时有利于控制土壤盐分的累积。采用HYDRUS-1D模型对盐碱地农田土壤水盐运移的模拟结果与田间试验实测结果基本吻合,该研究结果可为类似盐碱化地区农田水盐管理提供科学依据。

To determine the movement of salt and water in the saline-alkali flatland of Lubotan,Shaanxi province,based on the saturated-unsaturated soil water and solute transport theory,field monitoring data of local water and salt for many years was applied to simulate the rules of local soil water and salt movement,using the HYDRUS 1D numerical model. The soil water and salt changes were analyzed,and the reasonable field irrigation quota was proposed. The results showed that during the whole reproductive period,soil water content had a similar variation trend under different irrigation quotas. Considering water saving and salt control,farmland irrigation quota of 500 m^3·hm^-2is reasonable to control salt accumulation in soil. The simulated results of soil water and salt migration using HYDRUS model are basically consistent with the observed values in field experiment,and the results can be referred for farmland management of water and salt in semblable salinity regions.