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坡面林地土壤水分特征函数空间变异性初探

王盛萍 张志强 武 军 EDWARD Klaghofer 战伟庆 肖金强

王盛萍, 张志强, 武 军, EDWARD Klaghofer, 战伟庆, 肖金强. 坡面林地土壤水分特征函数空间变异性初探[J]. 环境科学研究, 2007, 20(2): 28-35.
引用本文: 王盛萍, 张志强, 武 军, EDWARD Klaghofer, 战伟庆, 肖金强. 坡面林地土壤水分特征函数空间变异性初探[J]. 环境科学研究, 2007, 20(2): 28-35.
WANG Sheng-ping, ZHANG Zhi-qiang, WU Jun, EDWARD Klaghofer, ZHAN Wei-qing, XIAO Jin-qiang. Preliminary Study on Spatial Variability of Soil Water Retention Function in a Chinese Pine (Pinus Tabliforms) Plantation[J]. Research of Environmental Sciences, 2007, 20(2): 28-35.
Citation: WANG Sheng-ping, ZHANG Zhi-qiang, WU Jun, EDWARD Klaghofer, ZHAN Wei-qing, XIAO Jin-qiang. Preliminary Study on Spatial Variability of Soil Water Retention Function in a Chinese Pine (Pinus Tabliforms) Plantation[J]. Research of Environmental Sciences, 2007, 20(2): 28-35.

坡面林地土壤水分特征函数空间变异性初探

基金项目: 国家自然科学基金资助项目(30271044);北京市自然科学基金资助项目

Preliminary Study on Spatial Variability of Soil Water Retention Function in a Chinese Pine (Pinus Tabliforms) Plantation

  • 摘要: 土壤水分特征函数空间异质性是定量研究土壤非饱和带水分运动以及溶质运移的先决条件. 以坡面机械布点采样、压力膜仪测定土壤水分特征曲线,并以Van-Genuchten模型拟合曲线后,用传统的统计方法与地统计方法,分析了密云水库流域周边人工油松林坡面土壤水分特征函数空间异质性. 结果表明:①不同土壤层各级压力下土壤含水量变异系数(Cv)呈中等变异性,Cv为10%~25%,土壤有效饱和度越低,变异性Cv越大,计算合理取样数目越大. ②模型参数θs为中等变异,Cv为17.77%~18.12%,服从正态分布;参数α为强变异性,Cv为70.65%~120.91%;参数n为弱变异性,Cv为5.29%~7.09%. ③各土壤层参数θs和α均具有空间变异结构,除20~40 cm层参数α符合指数模型外,其余层参数均符合球状模型,参数θs和α变程(A)分别约为66~69及21~69 m;参数n仅在20~40 cm土壤层显示空间变异结构,符合球状模型,变程(A)约为18 m;整体上该林地土壤0~20和20~40 cm层参数多以结构性变异为主,40~60 cm层参数的块金效应渐显增大. 最后采用Kriging插值方法分别对各参数进行了预测.

     

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  • 刊出日期:  2007-04-25

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