盐渍化农田土壤斥水性与理化性质的空间变异性  

SPATIAL VARIABILITY OF SOIL WATER REPELLENCY AND SOIL PHYSICAL-CHEMICAL PROPERTIES IN SALINE-ALKALINE FIELD

作　　者：郭丽俊[1] 李毅[1] 李敏[1] 任鑫[1] 朱德兰[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：《土壤学报》2011年第2期277-285,共9页Acta Pedologica Sinica

基　　金：国家自然科学基金(50709028);西北农林科技大学基本科研业务费专项资金(QN2009087);863计划项目(2010AA10A302)资助

摘　　要：摘要通过对新疆玛纳斯县盐渍化土壤三个不同尺度（间距分别为50m、5m及0．5m）的284个样点取样分析测定，采用经典统计学、空间自相关、地统计学和分形理论对土壤斥水性与理化性质进行空间格局分析。结果表明：1）土壤斥水性和pH符合正态分布，其余土壤属性符合对数正态分布。三尺度下土壤各属性绝大多数表现为中等变异水平。2）三尺度下土壤各属性的Moran’s I系数变化具有相似性，在-0．8～0．6范围内波动。3）三尺度下土壤各属性的半方差函数理论模型大多数能用球状模型来拟合。4）在一定范围内，土壤各属性具有一定的分形特征，分形维数变化幅度为1．75～1．96。分析表明不同尺度下土壤斥水性与理化性质具有一定的差异。Based on the measurement of two hundred and eighty four soil samples taken in grid patterns of three different scales （with intervals of 50 m, 5m and 0.5 m separately between sampling points） in a saline-alkaline field in Manasi County, Xinjiang, spatial patterns of soil water repellency and soil physical-chemical properties were analyzed by means of classical statistics, spatial autocorrelation theory, geostatistics and fractal theory. Results indicate that 1 ） both soil water re- pellency and pH followed a normal distribution while the other soil properties a lognormal distribution, and most of the soil properties studied varied to a moderate degree regardless of scales; 2）Moran＇s I coefficients of all the soil properties were quite similar in variation, which ranged from - 0.8 to 0.6 at all the three scales ; 3 ） most semi-variance theoretical models of the soil properties could be fit with spherical models at all the three scales; and 4）within a certain range, the soil properties showed fractal features, and their fractal dimensions varied in the range from 1.75 to 1.96. The findings indicate that soil water repelleney and soil physical-chemical properties are somewhat different in spatial distribution at different scales.

关 键 词：土壤斥水性 土壤理化性质 空间自相关 空间变异 分形 

分 类 号：S153.61[农业科学—土壤学]