中文摘要：

为了明确黑河中游绿洲麦田土壤导气率空间变异研究中的尺度性问题,在张掖地区面积为21 m×21 m的小麦田用3 m×3 m的网格布设来测定土壤导气率,运用改变采样间距和幅度的分析方法,得到选取相关距离、变异系数及Moran＇s I指数这3个参数作为判断表征土壤导气率空间变异的依据,进一步研究不同采样幅度与采样间距对土壤导气率空间变异产生的影响。研究结果表明,在一定范围内,表征土壤导气率变异特征的相关距离、变异系数及Moran＇s I指数会随着采样幅度尺度的增大而增大;当采样间距增大时,会出现相关距离减小,而Moran＇s I指数与变异系数两者却没有变化的两种截然相反的情况。

英文摘要：

This article attempts to analyze the impacts of sampling extent and sampling spacing on soil air permeability＇s spatial variability,and preliminary discuss the scale-dependency.The spatial variation of parameters in Linze County,an agricultural area in the middle reaches of Heihe River Basin,was examined.A study in a 21 m × 21 m of wheat zone was carried out,and the spatial variation of soil air permeability was analyzed with all the data measured under 3 m × 3 m sampling grid.Then,re-sampling technique was employed with including coefficient of variation,correlation length and Moran＇s I index were applied to each scenario to characterize the degree of spatial variability of soil air permeability.The results showed that all measured indices increased with various degrees with increasing extent.However, the spacing did not affect coefficient of variation and Moran＇s I index,while correlation length decreased with the increase of the spacing.