基于EMD方法的土壤入渗空间异质性及其影响因素研究  

Spatial Variability of Soil Infiltration and its Influencing Factors Based on EMD Method

作　　者：赵文刚[1] 邢旭光[1] 马孝义[1] 

机构地区：[1]西北农林科技大学旱区农业水土工程教育部重点实验室,陕西杨凌712100

出　　处：《灌溉排水学报》2016年第3期61-67,共7页Journal of Irrigation and Drainage

基　　金：国家自然科学基金项目(51279167);"十二五"国家科技支撑基金项目(2012BAD08B01);水利部公益性行业专项(201301016)

摘　　要：利用经典统计学方法和经验模态分解方法（EMD）,分析了杨凌区、武功县和乾县临平镇一带0～40cm土层土壤物理性质（初始含水率、体积质量、有机质、颗粒组成）和入渗性能（90min累积入渗量、初始入渗率、稳定入渗率）的空间变异性,研究了EMD分量对变异的贡献率,并进一步对多尺度下土壤入渗性能与土壤物理性质进行了相关性分析。结果表明：①土壤物理特性空间序列中,除土壤体积质量变异系数为0.08、表现为弱变异外,含水率、颗粒组成及有机质均表现为中等变异,变异系数为0.11～0.35;②对于土壤入渗特性,稳定入渗率、90min累积入渗量和初始入渗率均表现为中等变异,且三者变异程度依次减弱;③EMD分解研究发现：小尺度分量对土壤入渗性能总变异的贡献率比大尺度分量高;不同的土壤物理性质对土壤入渗性能的影响随尺度变化。The study on the soil physical properties（e.g.,initial water content,volume mass,organic matter,particle composition）in 0～40cm layers and spatial variability of soil infiltration（e.g.,90-min accumulated infiltration,initial infiltration rate and stable infiltration rate）was conducted in Yangling,Wugong and Qianxian regions,the classical statistics and empirical mode decomposition（EMD）methods were applied,and the relationships between soil physical properties and soil infiltration under multi-scale were further analyzed.The results showed that as for soil physical properties,the coefficient of variation of soil volume mass was 0.08,showing a weak variability;however,the coefficients of variation of soil water content,particle composition and organic matter ranged from 0.11 to 0.35,showing a moderate variability.As for soil infiltration properties,the degrees of variation were ranked in the order of stable infiltration rate〉90-min accumulated infiltration〉initial infiltration rate,and they all showed moderate variability.The original sequence of accumulated infiltration,initial infiltration rate and stable infiltration rate were decomposed into IMFcomponents based on EMD.And then the contribution rate of IMFs,and the relationships between IMFsand soil physical properties were analyzed.Results indicated that the contribution rate of small-scale IMFcomponent was higher than that of large-scale,and the influence of soil physical properties on infiltration varied with scales.

关 键 词：EMD 土壤入渗 空间变异 

分 类 号：S152.7[农业科学—土壤学]