生态学报2018，Vol.38Issue(8)：2906-2914,9.DOI:10.5846/stxb201706081043
桂西北喀斯特地区石灰土养分空间变异特征
Spatial variability of limestone soil nutrients in a Karst area of Northwestern Guangxi
摘要
Abstract
Large-scale spatial heterogeneity and distribution patterns of limestone soil nutrients in the karst areas of northwestern Guangxi were evaluated in this study,based on regional field survey and laboratory analysis combing with classical statistics and geostatistics.The results showed that pH value of limestone soil had little variation in the karst areas of Northwestern Guangxi,while the variation coefficients of soil nutrients ranged from 30％ to 75％,which can be considered as moderate variation.The characteristics of spatial variability differed among soil nutrients.Spherical model,Gaussian model,and linear model were the best-fit model for soil organic matter (SOM),available phosphorus (AP),and available potassium (AK),respectively.However,pH,available nitrogen (AN),total nitrogen (TN),total phosphorus (TP),and total potassium (TK) could be best fitted by exponential model.In addition,SOM,AP,TN,and TP showed moderate spatial autocorrelation,and spatial variability was caused by both random and structural factors.On the other hand,pH,AN,AK,and TK showed weak spatial autocorrelation,and spatial variability was mainly controlled by random factors.The variation range for SOM and TN were large while that for pH,AN,and TK were small.The contents of SOM,TN,TP,and AP exhibited a decreasing trend from west to east but the distribution of pH,AN,AK,and TK did not show any regularity on a regional scale.The correlation analysis demonstrated that,on a large scale,topographic factors (i.e.,altitude,slope and rock exposure rate) and vegetation type were important factors affecting the spatial variability of limestone soil nutrients in the karst areas of northwestern Guangxi.关键词
石灰土/养分/空间变异/喀斯特Key words
limestone soil/nutrients/spatial variability/Karst引用本文复制引用
俞月凤,胡芳,何铁光,宋同清,李丽娟,韦彩会,蒙炎成,唐红琴,李忠义,李婷婷..桂西北喀斯特地区石灰土养分空间变异特征[J].生态学报,2018,38(8):2906-2914,9.基金项目
国家自然科学基金项目(31460135) （31460135）
广西第十八批“十百千人才工程”专项 （）
广西农业科学院科技发展基金项目(桂农科2017JM08,2015JZ17) （桂农科2017JM08,2015JZ17）
广西农业科学院基本科研业务专项(2015YT31,桂农科2016YM56) （2015YT31,桂农科2016YM56）
