南方竹林地土壤有机碳空间异质性研究  

Research on Spatial Heterogeneity of Soil Organic Carbon in the Southern Bamboo Forest

作　　者：何平[1,2,3] 刘健[1,2,3,4] 余坤勇[1,2,3] 杨素萍[1,2,3] 姚雄[1,2,3] 俞欣妍[1,2,3] 邓洋波[1,2,3] 陈樟昊 

机构地区：[1]福建省资源环境监测与可持续经营利用重点实验室,福建福州350002 [2]福建农林大学林学院,福建福州350002 [3]福建农林大学3S技术应用研究所,福建福州350002 [4]三明学院,福建三明365000

出　　处：《土壤通报》2016年第2期278-286,共9页Chinese Journal of Soil Science

基　　金：国家林业局948项目(K43MLB01A);林业科技成果国家级推广项目(kh1130006)资助

摘　　要：土壤养分空间异质性是土壤质量评价的一个重要内容,为提高竹林有机碳估算精度,利用2013年永安六乡镇138个竹林地土壤有机碳样点数据,运用GIS技术和地统计学方法分析了永安市竹林地土壤有机碳数据的空间变异特征与格局。结果表明:竹林土壤养分有机碳含量极为丰富,全剖面及各层土壤有机碳含量在空间上属于中等变异;空间自相关Morans'I系数总体上随空间距离的增加而呈现递减趋势;全剖面、A层、B层及C层最佳理论模型依次为指数、高斯、指数、球状模型;半方差拟合决定系数分别为0.684、0.831、0.506、0.538,空间上均表现出强烈的自相关性,块金效应值分别为10.330%、13.100%、10.160%、0.120%;分形维数值为A层(1.964)>B层(1.962)>C层(1.944)>全剖面(1.938);从空间分布特征看,永安市毛竹林地土壤有机碳明显呈带状和斑块状分布,东部和西部有机碳含量明显高于中部。研究结果可为永安市竹林有机碳含量空间插值、制图和野外取样的设计提供参考,同时也可为精准农业和土壤可持续经营发展提供科学依据。The spatial heterogeneity of soil nutrients played an important role in soil quality evaluation. With 138 soil organic carbon（SOC） samples in 6 towns of Yong＇an County, GIS technique and statistical methods were applied to make an comprehensive analysis on the characteristics of spatial variability and distribution patterns in bamboo forest land to improve the estimation accuracy of SOC. The results showed that SOC content in bamboo forest was extremely abundant. SOC content spatially belonged to medium variation at the whole profile and each soil layer. Generally,spatial self-correlation index（Morans＇ I） showed a decreasing trend along with the increase in distance. The optimal theory models at the whole profile, Horizon A, Horizon B and Horizon C were belonged to, respectively, index mode,gaussian model, exponential model and spherical model and the determination coefficients of semi-variance fitting were, respectively, 0.684, 0.831, 0.506 and 0.538, indicating a strong space self-correlation.The nugget effect values were 10.33%, 13.10%, 10.16% and 0.12%, respectively, at the whole profile, Horizon A, Horizon B and Horizon C.Fractal dimension values of four layers were Horizon A（1.964）〉 Horizon B（1.962） 〉Horizon C（1.944） 〉the whole profile. In terms of SOC distribution patterns in Yong＇an bamboo forest, zonal and patch distribution were exhibited.And SOC content was significantly higher in the eastern and western parts than that in the middle. Research results could provide referential suggestions for spatial interpolation, mapping and sampling of SOC in the bamboo forest. The results could also be applied in precision agriculture, the soil sustainable management and development.

关 键 词：竹林地 土壤有机碳 永安 空间异质性 地统计学 GIS 

分 类 号：S153.6-2[农业科学—土壤学]