摘要
为了探究溶丘洼地土壤空间异质性及其影响因素,本文以驻马哨溶丘洼地为研究对象,利用经典统计学和地统计学的方法,从不同土地利用、坡度、坡向、土壤深度分析土壤容重、水分及有机质的空间异质性。结果表明:(1)土壤有机质为强变异,变异系数为0.71,容重和水分变异系数分别为0.15、0.11,属中等变异,土壤容重和水分呈极显著负相关,和有机质呈显著负相关,相关系数分别为-0.609、-0.581;(2)块基比介于0.78～0.97,随机部分引起的空间变异程度较大,空间自相关较小,且模型拟合较好。(3)耕地土壤有机质、水分含量最低,容重最大,而灌木土壤反之;(4)北坡土壤容重高于南坡,变异系数小于南坡;而土壤水分、有机质低于南坡,变异系数高于南坡。从不同坡位、坡向的比较中,皆体现了土地利用对土壤空间异质性的影响。在土地利用作为主要因素的影响下,驻马哨洼地土壤水分、容重、有机质由随机部分引起的空间变异增加,空间自相关减小。
The purpose of this work was to explore the influencing factors of soil spatial heterogeneity in Karst hilly depressions.Taking the hill depression catchment of Zhumashao as an example,by the methods of classical statistics and geostatistics,spatial heterogeneity of soil bulk density and water content and organic matter were analyzed in view of different land uses,slopes and aspects.The results show that the soil organic matter is strongly varied with a coefficient of variation(CV)0.71 while the soil bulk density and moisture are of moderate variation with CV 0.16 and 0.11,respectively.The soil bulk density is significantly negatively correlated with the moisture and organic matter with correlation coefficients-0.609 and-0.58,respectively.Geostatistics shows that the block-to-base ratio is between 0.78 to 0.97.The spatial variation caused by random part is large,the spatial autocorrelation is smaller,and the model fits well.Soil structure of the cultivated land is poor,with lowest organic matter and moisture content in the soil with largest bulk density,while the shrub is better.Soil bulk density in the north slope is higher than that of the south slope,while the CV is smaller than that of the south slope.And soil moisture content and organic matter on north slopes are lower than that of the south slopes.The effects of land use on spatial heterogeneity of soil are reflected in the comparison of different slope positions and directions.Under these effects,spatial variability of soil moisture,bulk density and organic matter increase from random parts,and spatial autocorrelation decreases.These information would be useful for prediction of soil property change and study in hilly depression areas.
作者
刘鹏
蒋忠诚
蓝芙宁
李衍青
于洋
LIU Peng;JIANG Zhongcheng;LAN Funing;LI Yanqing;Yu Yang(Forestry college of Guangxi University,Nanning 530001,China;Institute of Karst Geology,Chinese Academy of Geological Sciences/Key Laboratory of Karst Ecosystemand Treatment of Rocky Desertification,Ministry of land and Resources,Guilin,Guangxi 541004,China;China University of Geosciences(Wuhan),Wuhan,Hubei 430074,China;China Institute of Water Resources and Hydropower Research,Beijing 100038,China)
出处
《中国岩溶》
CAS
CSCD
北大核心
2019年第1期100-108,共9页
Carsologica Sinica
基金
国家重点研发专项计划课题(编号:2016YFC0502503)
国家自然科学基金青年基金(41502342)
国家自然科学基金面上项目(41471447)
广西自然科学基金(2015GXNSFBA139188)
关键词
空间异质性
土地利用
溶丘洼地
spatial heterogeneity
land use
hill depression catchment
