红枣经济林不同植被覆盖土壤水分入渗特征

【目的】模拟不同植被覆盖土壤水分入渗过程并选择该研究区的最适模型。【方法】采用野外双环入渗试验方法,测定了不同植被覆盖下土壤水分入渗特征,采用Philip模型、Horton模型、Kostiakov模型对不同植被覆盖区土壤水分入渗过程进行拟合。【结果】①不同植被覆盖区土壤水分入渗速率均表现为初始入渗速率最大,平均入渗速率次之,稳定入渗速率最小;②自然生草区土壤初始入渗速率最大,清耕区土壤的平均入渗速率和稳定入渗速率最大,且清耕区与自然生草区土壤初始入渗速率、平均入渗速率和稳定入渗速率均差异显著;③Horton入渗模型对不同小区土壤入渗过程拟合效果最好,Philip入渗模型拟合效果次之,Kostiakov入渗模型拟合效果最差。【结论】红枣经济林不同植被覆盖下土壤水分入渗特征具有显著差异,Horton入渗模型更适合研究该区域红枣经济林土壤水分入渗过程。

Characteristics of Soil Water Infiltration in Different Vegetation Cover of Jujube Economic Forest

【Objective】We aimed to study the effects of different vegetation cover on soil water infiltration characteristics of jujube economic forest, to simulate the soil water infiltration process of different vegetation cover and select the optimal model of the study area.【Method】 The soil water infiltration characteristics of jujube economic forest under different vegetation cover were conducted by using the field double-ring infiltration test method.The soil water infiltration process of different vegetation cover areas was stimulated by using Philip model, Horton model and Kostiakov model.【Result】①The soil infiltration rate of different vegetation cover areas showed the initial infiltration rate was the highest, the average infiltration rate being second,and the stable infiltration rate was the lowest;②The initial infiltration rate of soil in natural grassland was the largest,while the average infiltration rate and the stable infiltration rate of the soil in the clearing area were the highest, and the initial infiltration rate, the average infiltration rate and the stable infiltration rate of the soil in the clearing area and the natural grass area were significantly different. ③The Horton infiltration model had the best fitting effect on soil infiltration process in different areas. The fitting effect of Philip infiltration model was second, and the Kostiakov infiltration model had the worst fitting effect.【Conclusion】The characteristics of soil water infiltration under different vegetation cover of red jujube economic forest were significantly different. The Horton infiltration model is more suitable for studying the soil water infiltration process of the jujube economic forest in this area.