土壤水盐空间异质性及尺度效应的多重分形  

Multifractal study on spatial variability of soil water and salt and its scale effect

作　　者：刘继龙[1] 马孝义[1] 张振华[2] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,杨凌712100 [2]鲁东大学地理与规划学院,烟台264025

出　　处：《农业工程学报》2010年第1期81-86,I0004,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(50879072和50609022);国家科技支撑计划(2006BAD11B04);国家"863"计划课题(2006AA100209);西北农林科技大学人才专项资金项目(BJRC-2009-001)

摘　　要：为了揭示研究区域林地内土壤含水率和电导率的空间分布特征及尺度效应,利用多重分形方法,对杨凌一林地内不同采样时间和不同采样面积下土壤含水率和电导率的空间异质性进行了研究。结果表明:3种采样面积下土壤含水率和电导率的空间异质性都分别随平均含水率和电导率的增大而减弱。随采样面积的增大,平均含水率和电导率较高时,土壤含水率的空间异质性趋于增强,土壤电导率的尺度效应不明显;平均含水率和电导率较低时,土壤含水率和电导率的空间分布都存在明显的斑块结构。不同采样时间和不同采样面积下土壤含水率和电导率的多重分形谱的形态有所差异,表明引起他们空间异质性的信息有所不同。多重分形分析能揭示出较多的采样林地内土壤含水率和电导率分布的局部信息。In order to reveal spatial distribution characteristics of soil water and electrical conductivity in woodland in studied area and their scale effects,the paper studied spatial variability of soil water and electrical conductivity under different sampling time and area in woodland in Yangling with multifractal method.The results showed that spatial heterogeneity of soil water and electrical conductivity under three kinds of sampling area decreased with the increase of average water content and electrical conductivity.As sampling area increased,when average water content and electrical conductivity were high,spatial heterogeneity of soil water became large,and scale effect of soil electrical conductivity was not obvious;when average water content and electrical conductivity were low,their spatial distribution had obvious patch structure.Multifractal spectrums of soil water and electrical conductivity were different under sampling time and area,which indicated that their spatial heterogeneity were caused by different information.Multifractal analysis could reveal more local information of soil water and electrical conductivity in sampling woodland.

关 键 词：土壤 水分 空间变量控制 含水率 电导率 空间异质性 尺度效应 多重分形 

分 类 号：S152.7[农业科学—土壤学]