若尔盖高寒草甸表层土壤水分特征曲线传递函数研究  

Pedo-Transfer Functions of Soil Water Retention Curve for Alpine Meadow Grassland in Zoige Area,China

作　　者：崔俊芳 邓建波 刘传栋 唐翔宇[1] CUI Junfang;DENG Jianbo;LIU Chuandong;TANG Xiangyu(Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China;College of Water Resources and Hydropower,Sichuan Agricultural University,Ya an 625000,Sichuan,China;College of Ecology and Environment,Hainan University,Haikou 570228,China)

机构地区：[1]中国科学院、水利部成都山地灾害与环境研究所,成都610041 [2]四川农业大学水利水电学院,四川雅安625000 [3]海南大学生态与环境学院,海口570228

出　　处：《山地学报》2021年第4期483-494,共12页Mountain Research

基　　金：国家自然科学基金青年基金(41501237);中国科学院前沿局项目(QYZDJ-SSW-DQC006)。

摘　　要：土壤水力学性质是土壤水文和流域水文模型模拟的重要参数。通过代表性样点采样分析,建立土壤基本理化指标为自变量的传递函数,是区域尺度土壤水力学参数估算的一种重要方法。受水文气候条件、土壤属性等多要素的影响,现有土壤水力学参数传递函数模型在高寒地区的适用性较为有限。为获得高寒草地准确的土壤水力学参数,本文以青藏高原东缘若尔盖高寒草甸表层土壤(0~20 cm)为研究对象,测定了土壤基本理化性质(有机质含量、容重、颗粒组成等)和土壤水分特征曲线。在van Genuchten(VG)模型参数拟合及Pearson相关分析的基础上,运用多元逐步线性回归分析法,分别构建了VG模型参数估算模型和三组点估算模型。结果显示:(1)采用本研究构建的土壤水力学传递函数所得的估算值与实测数据的相对误差与平均相对误差总体小,准确度高;(2)本文构建的点估算模型拟合效果均较好,在基本理化性质的基础上增加滞留含水量(θr)和田间持水量(θ_(330)),均能提高传递函数的估算准确度;(3)对于土壤数据较为缺失的高寒草地区域,以只采用土壤颗粒组成、容重和有机质含量作为自变量构建的传递函数组A更具可行性。该研究为高寒草地土壤水力学参数的估算提供了实用的函数工具,其应用可为高寒草甸土壤水文、生态、水资源管理等研究提供参数支撑。Soil hydraulic properties are crucial parameters in the studies of soil water movement and the simulation of soil hydrological process and watershed hydrology models.Measurements of soil hydraulic properties on many samples are very costly and difficult in alpine regions due to tough field works.Research on the construction of Pedo-Transfer Functions(PTFs)for soil hydraulic parameters through samples analysis collected at representative sites is a practical approach to determination of soil hydraulic characteristics from available soil properties at regional scale.Due to the influence of hydro-climatic conditions,soil properties and relevant factors,PTFs of soil hydraulics parameters often present strong regional limitations,and the applicability of existing transfer function models in alpine regions is limited.In order to obtain the PTFs of soil hydraulic properties in alpine meadow grassland,surface soils(0~20 cm)were collected in Zoige grassland on the eastern edge of the Qinghai-Tibet Plateau of China and they were analyzed for basic physical and chemical properties and soil water rentention curves.On the basis of the results of curve fitting with van Genuchten model and Pearson correlation analysis between soil properties and fitted hydraulic parameters,PTFs of soil hydraulic properties were obtained by multivariate stepwise linear regression analysis.Three sets of point estimation models(PTFs Group A,Group B and Group C)based on soil physical and chemical properties and soil volumetric water content under specific soil suction conditions were developed in this study.Results showed:(1)PTFs established in this study performed well with low relative errors and average relative errors;(2)Three sets of point estimation models(PTFs Group A,Group B and Group C)fitted well.Results also found adding soil residue water content(θr)and field water holding capacity(θ_(330))to independent variable could improve the accuracy of PTFs estimation;(3)For alpine grassland areas,where soil data is relatively scarce,PTFs Group

关 键 词：土壤水力学参数 土壤传递函数 高寒草甸土 van Genuchten模型 若尔盖 青藏高原 

分 类 号：X143[环境科学与工程—环境科学]