Spatial autocorrelation analysis of soil water content in a karst region of Guangxi Province
YANG Qi-yong
JIANG Zhong-cheng
YUAN Dao-xian
JIANG Yong-jun
SHEN Li-na
Abstract：Mashan county,located in the middle Guangxi Zhuang Autonomous Region,southwestern China, was selected as the study area.Based on the plentiful information from field surveys,soil sampling and labo-ratory analysis,we were studied the spatial autocorrelation coefficients,correlation distances and spatial pat-terns of soil water content in topsoil (0 – 20 cm)using semi-variances and Moran’s I statistics.The results show that the mean value of soil water content is 1 6.97%.Soil water content shows a moderate spatial auto-correlation within the distance of 78.8 km,which is affected by the constitutive and random factors.(2)Mo-ran index of soil water content in the study area is 0.43,suggesting that the soil water content possesses spa-tial autocorrelation.In the ranges of 0-21.7 km and 31-34 km,the values of Moran′s I of soil water con-tent are greater than 0,implying positive spatial autocorrelation;while in the ranges of 21.7-31 km and 34-45 km,the values are negative,indicating negative spatial autocorrelation.Lisa cluster maps show that there are spatial aggregation areas and spatial isolated areas of the soil water content.The “high-high”spatial aggregation areas cluster in the northeast of Mashan county and “low-low”spatial aggregation clustered in the southeast.There are bigger risk of short of soil water content in the “low-low”spatial aggregation and“high-low”spatial isolated areas.
Keywords：soil water contentsemi-variancesspatial autocorrelationspatial heterogeneity
Publication Date：2015-05-02
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 260-265 )