南酸枣落叶阔叶林土壤有机碳空间变异及影响因素  

Spatial Heterogeneity and Impact Factors of Soil Organic Carbon in a Choerospondias axillaris Deciduous Broad-leaved Forest

作　　者：蒋芳[1,2] 吴小红[1,2] 项文化[1,2] 

机构地区：[1]中南林业科技大学生命科学与技术学院,湖南长沙410004 [2]南方林业生态应用技术国家工程实验室,湖南长沙410004

出　　处：《广西林业科学》2016年第2期143-148,共6页Guangxi Forestry Science

基　　金：国家自然科学基金项目(41503081)

摘　　要：采用地统计学方法分析了南酸枣（Choerospondias axillaris）落叶阔叶林不同土层（0~10 cm、10~20cm、20~30 cm）土壤有机碳含量的空间异质性特征及其影响因素。结果表明：不同层次土壤有机碳含量范围为4.67~46.34 g/kg,变异程度为27.09%~43.75%,属于中等程度变异,且变异程度随土层深度加深而变大。半方差函数分析显示土壤有机碳含量表现出强烈的空间自相关关系,表明土壤有机碳空间异质性主要由结构性因素引起;土壤有机碳含量变程（A0）范围为12.3~28.8 m。空间插值（Ordinary Kriging）结果显示土壤有机碳含量的高值分布在低海拔或洼地,呈现出明显的条带状和斑块状分布。海拔、凋落物、凹凸度、含水率显著影响土壤有机碳含量的空间分布。Geostatistics and Geographical Information System（ GIS） were applied to investigate the spatial heterogeneity and impact factors of soil organic carbon content at different soil depths（ 0 – 10 cm,10 – 0 cm and 20 – 30 cm） in a deciduous broad-leaved forest（ Choerospondias axillaris） in Changsha City,Hunan Province. The results showed that soil organic carbon content ranged from 4. 67 g/kg to46. 34 g/kg at different soil depths with variation coefficients varying from 27. 09% to 43. 75%,revealing a moderate degree of variation. The spatial variations of soil organic carbon content increased with the increase of soil depth. The semi-variogram analysis showed that soil organic carbon content displayed strong spatial autocorrelations,mainly caused by structural factors in the study area. The range（ A0） of soil organic carbon content varied from 12. 3 m to 28. 8 m. The results of Ordinary Kriging showed that soil organic carbon content revealed a belt shape and plaque form in study area,with higher soil organic carbon contents observed in lower elevation and low-lying land. Elevation,litter biomass,convexity and moisture content were factors that significantly affected spatial heterogeneity of soil organic carbon content.

关 键 词：南酸枣 落叶阔叶林 土壤有机碳 空间异质性 地统计学 

分 类 号：S792[农业科学—林木遗传育种]