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    西北黄土区典型重建植被土壤入渗特征分析

    Examination of soil infiltration characteristics of typical revegetation in the loess region of Northwest China

    • 摘要: 目的探究西北黄土区典型重建植被土壤入渗特征,评价不同入渗模型在该地区典型重建植被的适用性。方法以西北黄土区6种典型重建植被为研究对象,分析不同植被类型土壤理化性质、入渗特征及两者之间的关系,评价Philip、Kostiakov、Horton和蒋定生模型在该地区的适用性。结果不同植被类型土壤容重以侧柏地最大(1.25 g/cm3),骆驼刺最小(1.15 g/cm3);土壤含水率以柠条-柽柳地最优(4.90%),柠条林地最差(2.75%);土壤化学性质以刺槐林地最好,其土壤有机质、全氮、碱解氮、有效磷、速效钾分别为5.83 g/kg、0.69 g/kg、36.46 mg/kg、2.85 mg/kg、236.22 mg/kg。土壤入渗过程被划分为快速波动、缓慢波动和稳定阶段三个阶段。0-20 cm土壤初始入渗率、平均入渗率和稳定入渗率均大于20-40 cm;不同植被类型以刺槐和骆驼刺具有较优的土壤入渗性能。Kostiakov模型在该地区不同植被类型土壤入渗模型模拟过程中适用性最好,Philip模型的适用性最差。土壤容重、含水率与土壤入渗特征负相关,而有机质、全氮、碱解氮、有效磷和速效钾与土壤入渗特征均呈正相关。结论6种典型重建植被,以刺槐林地土壤理化性质最优,土壤入渗特征较好,Kostiakov模型更适用于模拟该地区土壤入渗,研究结果为该地区进一步植被优化配置和土壤水分管理提供科学依据。

       

      Abstract: Objective This study aims to investigate the soil infiltration properties of typical revegetation found in the Loess Plateau of Northwest China, as well as to assess the suitability of various infiltration models for this type of vegetation in the region. Methods This research focused on six representative revegetation types found in the Loess Plateau of Northwest China. It examined the physical and chemical properties of the soil, the infiltration characteristics associated with various vegetation types, and the interrelationships among these factors. Additionally, the study assessed the suitability of the Philip, Kostiakov, Horton, and Jiang Dingsheng models for application in this specific region. Results The bulk density of soil exhibits variation across various vegetation types, with the side-pearl pine region recording the highest density at 1.25 g/cm³, while the camelthorn region shows the lowest density at 1.15 g/cm³; in terms of soil moisture content, the lemming-tamarisk area demonstrates the highest level at 4.90%, contrasting with the lemming forest area, which has the lowest moisture content at 2.75%; regarding soil chemical properties, the locust tree forest area ranks the highest, with measurements of soil organic matter, total nitrogen, alkali-hydrolyzable nitrogen, available phosphorus, and available potassium recorded at 5.83 g/kg, 0.69 g/kg, 36.46 mg/kg, 2.85 mg/kg, and 236.22 mg/kg, respectively. The process of soil infiltration is categorized into three distinct stages: rapid fluctuation, slow fluctuation, and a stable stage. The initial infiltration rate, average infiltration rate, and stable infiltration rate for the 0-20 cm soil layer exceed those of the 20-40 cm layer; various vegetation types, including honey locust and camel thorn, demonstrate superior soil infiltration capabilities. Among the models used to simulate soil infiltration for different vegetation types in this region, the Kostiakov model exhibits the highest applicability, whereas the Philip model shows the least applicability. Furthermore, soil bulk density and moisture content are found to be negatively correlated with soil infiltration characteristics, while organic matter, total nitrogen, alkali-hydrolyzable nitrogen, available phosphorus, and available potassium are positively correlated with these characteristics. Conclusions Among six common types of revegetation, the black locust forest exhibited the most favorable soil physical and chemical properties, along with commendable soil infiltration characteristics. The Kostiakov model proved to be the most appropriate for simulating soil infiltration in this region. The findings of this research offer a scientific foundation for the optimization of vegetation configuration and the management of soil water in the area.

       

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