摘要
土壤-表层岩溶带厚度是喀斯特地球关键带的关键指标,明确其空间异质性特征对于理解地球关键带结构演化机理以及评估水源涵养功能具有重要意义。在广西环江木连小流域1.4 km 2范围内,通过高密度电法(ERT)探测45条样线,共获取1731个样点的土壤-表层岩溶带厚度及环境因子数据资料,研究了土壤和表层岩溶带厚度的空间分布格局及其影响因素。结果表明,土壤和表层岩溶带厚度平均值分别为1.15 m和6.44 m,且分别呈现强变异程度和中等变异程度。地统计分析结果表明球状模型和指数模型分别可以反映土壤和表层岩溶带的空间结构特征。土壤厚度呈现中等空间自相关性,变程长,空间连续性好;而表层岩溶带呈现强烈的空间自相关性,变程短,空间依赖性强。土壤厚度受到环境因子(地形湿度指数、垂直曲率、曲率、坡向、坡度、高程、覆盖度、出露基岩率和植被归一化指数)的多重影响,而表层岩溶带厚度受部分环境因子影响的同时,与土壤厚度和植被类型的相关性更高。研究结果有助于喀斯特区土壤-表层岩溶带演化机理认识,并为土壤-表层岩溶带厚度的空间预测提供科学依据。
[Objective]The thickness of soilepikarst is an important index affecting the hydrological process of critical 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 km 2 area of the Mulian catchment in Huanjiang,Guangxi,the 1731 soil-epikarst thickness samples were obtained through electrical 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 geostatistical analysis indicated that the spherical model and exponential model could reflect the spatial structure characteristics 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 dependence with a short range.Soil thickness was affected by multiple environmental factors(topographic wetness index,vertical curvature,curvature,aspect,slope,elevation,coverage,outcrop ratio and NDVI),while the thickness 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.
作者
王发
聂云鹏
陈洪松
付智勇
连晋姣
WANG Fa;NIE Yunpeng;CHEN Hongsong;FU Zhiyong;LIAN Jinjiao(Key Laboratory of Agro-ecological Processes in Subtropical Region,Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha 410125,China;Huanjiang Observation and Research Station of Karst Ecosystem,Chinese Academy of Sciences,Huanjiang Guangxi 547000,China)
出处
《地质科技通报》
CAS
CSCD
北大核心
2024年第1期306-314,共9页
Bulletin of Geological Science and Technology
基金
广西自然科学基金创新研究团队项目(2018GXNSFGA281003)
国家自然科学基金项目(41971048
42077077)
中国博士后科学基金项目(2022M713349)。
