网格尺度上宁夏平原区土壤水分入渗空间变异性分析  

Spatial Variability of Soil Water Infiltration of the Grid Scale in Ningxia Plain

作　　者：李丽梅[1] 胡华[1] 

机构地区：[1]宁夏大学,银川750021

出　　处：《灌溉排水学报》2015年第9期49-54,共6页Journal of Irrigation and Drainage

基　　金：国家自然科学基金项目(51269025);宁夏自然科学基金重点项目(NZ13008)

摘　　要：以宁夏平原区从北到南3个典型试验区进行的入渗试验为基础,采用经典统计学方法、Pearson相关系数法以及多重分形方法研究宁夏平原区土壤水入渗水力特性的空间变异性及其与土壤物理特性的相关关系。结果表明,1土壤水力特性中,稳定入渗率、累积入渗量、饱和含水率均具有多重分形特征,且分别在3个试验区都具有较强的空间变异性。2从北到南稳定入渗率和累积入渗量空间变异性呈走强趋势,相反饱和含水率空间变异性从北到南呈走弱趋势。3土壤水力特性均受长距离变异影响,且由高值造成,但是通过分析土壤基本物理特性与土壤水力特性的相关关系及多重分形谱宽度、多重分形谱图、广义维数等,发现3个试验区土壤物理特性的空间变异性各有不同,且造成3个试验区的土壤水力特性及其土壤物理特性的因素也不尽相同。Based on the infiltration experiment of the three typical test areas in Ningxia Plain from north to south,the classical statistical method,pearson correlation coefficient method and multifractal were implemented to analyze the spatial variability of the hydraulic properties and its relation with the soil physical properties in Ningxia Plain.The results showed that,firstly,the hydraulic properties of soil water infiltration were multifractal and had strong spatial variability in three typical test areas,respectively.Secondly,the spatial variability of the steady infiltration rate and cumulative infiltration showed a strengthening momentum;on the contrary the saturated moisture showed a weakening momentum.Thirdly,the soil hydraulic properties were affected by long-distance variation,and were caused by big data.However,by analyzing the basic physical properties of soil and the correlation between soil hydraulic properties and multifractal spectrum width,multifractal spectrum graph and the generalized dimension,etc,in three experimental areas,it was found that the spatial variation of soil physical properties varies,and the causes of soil hydraulic properties and soil physical properties of the three experimental areas were also different.

关 键 词：经典统计学方法 Pearson相关系数法 多重分形方法 空间变异性 

分 类 号：S152.7[农业科学—土壤学]