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为揭示干旱荒漠区农田畦灌模式下的田间尺度土壤水盐运移规律,选定甘肃省景泰川电力提灌灌区为研究区,基于HYDRUS-3D模型,对田间尺度畦灌模式下的土壤水盐运移特征和分布过程进行模拟,以现场田间试验数据对率定后的模型模拟结果进行了验证。结果表明:运用田间试验实测值对HYDRUS-3D模型中的参数及边界条件修正之后,模拟结果与田间实测值的差别很小,模型的可靠性较好;在灌溉-入渗与蒸发作用下,灌溉后的土壤含水率沿纵向呈现出明显的分层现象,畦田上层土壤含水率约为22%,中间土层的含水率约为26%,深层土壤的含水率约为29%;土壤含盐量沿纵向亦呈现出明显的分层现象,6.5 mg/cm3(0～20 cm)、4.5 mg/cm3(20～40 cm)、4.3 mg/cm3(40～60 cm)、3.5 mg/cm3(60～80 cm)、2 mg/cm3(80～100 cm),整个田块土壤含盐量呈现出先下降再上升最后逐渐趋于稳定的变化趋势,畦田土壤含盐量平均值稳定在4.16 mg/cm3左右。上述模拟结果可为研究区灌溉制度的优选以及土壤盐碱化治理提供决策依据。
Abstract：In order to reveal the field-scale soil water and salt transport pattern under the field irrigation mode in arid desert areas, we take Jingdian irrigation district in Gansu province as the study area. Based on the HYDRUS-3 D model, the soil water and salt transport characteristics and distribution processes under field-scale border irrigation mode are simulated, and the results of the model simulation after rate determination are verified with field trial data. The results show that the difference between the simulation results and the measured values in the field is small and reliable after correcting the parameters and boundary conditions in the HYDRUS-3 D model by using the measured values from field trials. Under the action of irrigation-infiltration and evaporation, the water content of irrigated soil show a clear stratification phenomenon along the longitudinal direction, with the water content of the upper soil layer of the border field being about 22%, the water content of the middle soil layer being about 26%, and the water content of the deep soil layer being about 29%. Soil salinity also show obvious stratification along the longitudinal direction, with 6.5 mg/cm3(0～20 cm), 4.5 mg/cm3(20～40 cm), 4.3 mg/cm3(40～60 cm), 3.5 mg/cm3(60～80 cm), and 2 mg/cm3(80～100 cm), and the soil salinity of the whole field show a trend of decreasing, then increasing and gradually stabilizing, and the average soil salt content of the field is stable at about 4.16 mg/cm3.The above simulation results can provide a decision basis for the preferential selection of irrigation system and soil salinization management in the study area.
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基本信息:
DOI：10.13928/j.cnki.wrahe.2021.07.002
中图分类号:S156.4;S274
引用信息:
[1]徐钰德,刘子金,程慧,等.基于HYDRUS-3D的畦灌模式下田间水盐运移模拟[J],2021,52(07):14-22.DOI:10.13928/j.cnki.wrahe.2021.07.002.
基金信息:
国家自然科学基金资助项目(51579102);; 河南省高校科技创新团队支持计划(19IRTSTHN030);; 中原科技创新领军人才支持计划(204200510048)