河北坝上地区草地坡面尺度土壤容重空间变异特征  

Slope Scale Spatial Variation of Soil Bulk Density in a Grassland in the Bashang Region of Hebei Province

作　　者：周卓丽 张卓栋 罗建勇 邹心雨 肖人杰 ZHOU Zhuo-li;ZHANG Zhuo-dong;LUO Jian-yong;ZOU Xin-yu;XIAO Ren-jie(State Key Laboratory of Earth Surface Processes and Resource Ecology,Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China)

机构地区：[1]北京师范大学地理科学学部地表过程与资源生态国家重点实验室,北京100875

出　　处：《土壤通报》2020年第1期9-17,共9页Chinese Journal of Soil Science

基　　金：国家自然科学基金项目(41730748,41301282);国家重点研发计划课题(2017YFA0604704)资助。

摘　　要：以河北坝上地区的典型草地坡面为研究对象,运用传统统计学、地统计学方法,研究坡面尺度不同深度土壤容重的空间变异特征。通过土壤容重与其它土壤性质间的相关分析,探究其空间变异的影响因素。结果表明:该坡面土壤容重的平均值约为1.08 g cm-3,其在空间分布上差异显著,总体为凸坡>偏凸坡>偏凹坡>凹坡。地统计分析得出0~5 cm表层土壤容重呈弱空间自相关性;20~25 cm和40~45 cm这两层土壤容重具有中等空间自相关性;10~15 cm、30~35 cm和50~55 cm这三层土壤容重具有强空间自相关性。地形是影响坝上地区坡面尺度土壤容重空间变异的关键因素;在地形控制影响下,土壤有机质含量对土壤容重的影响最显著,其次是机械组成,植物根系生物量对土壤容重的影响在凸坡较显著。草地坡面土壤容重具有较强的空间变异性,说明小尺度土壤容重空间变异的研究值得关注。Based on a typical grassland slope in the Bashang Region of Hebei Province,spatial variation of soil bulk density(BD)at different depths was studied by statistical and geostatistical methods.Correlation analysis between BD and other soil properties was made to explore the influencing factors to BD.Results showed that the average BD in the slope was 1.08 g cm-3,and BD varied significantly across the slopes.The overall distribution of BD was that convex>sub-convex>sub-concave>concave slopes.Geostatistical analysis indicated that the BD at 0-5 cm soil layer had a weak spatial autocorrelation,that at 20-25 cm and 40-45 cm had a moderate spatial autocorrelation and that at 10-15 cm,30-35 cm and 50-55 cm showed a strong spatial autocorrelation.Topography was the key factor to spatial variation of BD at the slope scale.Under the control of topography,soil organic matter had the largest influence on BD,and BD was also affected by particle size distribution.The influence of root biomass on BD was only found on the convex slope.BD showed strong spatial variability at the slope scale,which indicated the importance of spatial variation for BD studies at a small scale.

关 键 词：土壤容重 空间变异 坡面尺度 坡形 坝上地区 

分 类 号：S152.5[农业科学—土壤学]