[Objective]The thickness of soilepikarst is an important index affecting the hydrological process of crit-ical zones.The spatial heterogeneity is critical understanding the structural evolution mechanism of the key zones of the Earth and the water conservation function of the key zones of the Earth.[Methods]Based on the 1.4 km2area of the Mulian catchment in Huanjiang,Guangxi,the 1 731 soil-epikarst thickness samples were obtained through e-lectrical resistivity tomography(ERT)with 45 sampling lines.The spatial distribution pattern of soil and epikarst thickness and its influencing factors were investigated.The results showed that the average thickness of soil and epikarst was 1.15 m and 6.44 m with strong and medium variance,respectively.[Results]The results of geosta-tistical analysis indicated that the spherical model and exponential model could reflect the spatial structure charac-teristics of soil and epikarst thickness,respectively.Soil thickness showed moderate spatial autocorrelation,a long range and good spatial continuity.However,the epikarst presented strong spatial autocorrelation and spatial de-pendence with a short range.Soil thickness was affected by multiple environmental factors(topographic wetness in-dex,vertical curvature,curvature,aspect,slope,elevation,coverage,outcrop ratio and NDVI),while the thick-ness of epikarst was more affected by soil thickness and vegetation type.[Conclusion]These results are helpful for understanding the evolution of the soil-epikarst zone and provide a scientific basis for the spatial prediction of soil-epikarst thickness in karst areas.
关键词
喀斯特关键带/空间异质性/土壤-表层岩溶带/植被类型/白云岩小流域
Key words
karst critical zone/spatial heterogeneity/soil-epikarst/vegetation type/dolomite small watershed
维普
万方数据