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黄土高原坡地表层土壤饱和导水率和水分含量空间变异特征
引用本文:刘春利,邵明安.黄土高原坡地表层土壤饱和导水率和水分含量空间变异特征[J].中国水土保持科学,2009,7(1):13-18.
作者姓名:刘春利  邵明安
作者单位:1. 西北农林科技大学,中国科学院,水利部,水土保持研究所黄土高原土壤侵蚀和旱地农业国家重点实验室,712100,陕西杨凌;山东大学威海分校,264209,山东威海;中国科学院研究生院,100049,北京
2. 西北农林科技大学,中国科学院,水利部,水土保持研究所黄土高原土壤侵蚀和旱地农业国家重点实验室,712100,陕西杨凌
基金项目:教育部长江学者和创新团队发展计划,中国科学院创新团队国际合作伙伴计划 
摘    要:表层土壤水分含量和饱和导水率对深层土壤水分的动态的变化具有重要的决定作用。在黄土高原坡地(50m×360 m)范围内进行网格(10 m×10 m)取样,用地统计学方法研究表层(0~30 cm)土壤饱和导水率和水分含量的空间变异特征。结果表明:1)坡地表层土壤密度变化规律为坡下位大于坡上位,土壤饱和导水率变异系数为0.37,属于中等变异强度;2)饱和导水率和自然对数化的饱和导水率在360 m尺度内均不具备空间结构特征,是纯随机变量,线性有基台模型适用于描述表层土壤水分的分布特征,水分分布存在明显的块金效应,并且随滞后距离的增加半方差变大;3)饱和导水率和水分含量从坡上位到坡下位均呈现波浪式变化,饱和导水率大的采样点土壤水分含量低,反之则高。

关 键 词:土壤饱和导水率  土壤水分  空间变异  黄土高原

Spatial variation of saturated hydraulic conductivity and soil water of the surface layer of a slope on the Loess Plateau
LIU Chunli,SHAO Ming'an.Spatial variation of saturated hydraulic conductivity and soil water of the surface layer of a slope on the Loess Plateau[J].Science of Soil and Water Conservation,2009,7(1):13-18.
Authors:LIU Chunli  SHAO Ming'an
Institution:1.Northwest Science University of Agriculture and Forestry State Key Laboratory of Soil Erosion and Dry land Farming on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences,712100,Yangling,Shaanxi;2.Shandong University at Weihai,264209,Weihai,Shandong;3.Graduate University of Chinese Academy of Sciences,100049,Beijing: China
Abstract:A geo-statistical method was used to study the spatial variability of a soil surface layer(0-30 cm),for analysis of the spatial patterns of saturated hydraulic conductivity and soil water,on a slope(50 m×360 m) of the Loess Plateau,using a grid sampling method(10 m×10 m space).Results indicated that bulk density of the layer is higher at the bottom than that at the top.The variation coefficient of the soil saturated hydraulic conductivity is 0.37,which belongs to the middle variation degree.Saturated hydraulic conductivity and its natural logarithm have no characteristic spatial variability in the 360 m distance,indicating that both are purely random variables;a line model can be used to describe the characteristic variation in soil water.The distribution of soil water has an obvious nugget effect,the semi-variance increasing with an increase in lag distance.Saturated hydraulic conductivity and soil water content fluctuate wavily along the slope with the largest values of saturated hydraulic conductivity corresponding to the lowest values of soil water.Conversely,soil water is high when saturated hydraulic conductivity is low.
Keywords:soil saturated hydraulic conductivity  soil moisture  spatial variation  Loess Plateau
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