广西植物2017，Vol.37Issue(11)：1418-1427,10.DOI:10.11931/guihaia.gxzw201611037
广西不同森林类型土壤有机碳的空间异质性
Spatial heterogeneity of soil organic carbon under different forest types across Guangxi
摘要
Abstract
By combination of classical statistics, geostatistics and geographic information system, the spatial heterogeneity of soil organic carbon (SOC) in different layers (0-10, 10-20, 20-30, 30-50 and 50-100 cm) of ten kinds of major forest types in Guangxi were studied. Soil samples were collected from 115 sampling locations and 345 plots (50 m × 20 m), according to 10 km × 10 km grid. The results showed that the average content of SOC in different forests in Guangxi ranged from 8.01 to 29.78 g·kg-1 and the coefficient of variation (CV) ranged from 50.27% to 74.89%. The semivariagram of SOC in 10 - 20 cm soil layer was best fitted with exponential model whereas those in other soil layers were best fitted with spherical model. The nugget effect of semivariagram of SOC in all soil layers ranged from 16.75% to 49.33%, indicating a strong or a moderate spatial autocorrelation. Kriging interpolation results showed characteristics of spatial distribution of SOC in different soil layers were similar, i.e., higher in the north while lower in the south, and the maximum and minimum occurred in the northeast and the southeast of Guangxi, respectively. The average of SOC and its CV varied with forest type and soil layer, and the average of SOC in 0 -100 cm layer followed the order: Castanopsis >Cunninghamia lanceolata > Cyclobalanopsis glauca > Liquidambar > Bambusa multiplex > Octagon > Eucalyptus > Camellia oleifera > Quercus > Pinus. On the whole, SOC decreased with increasing soil depth, while the CV exhibited an opposite trend. The spatial heterogeneity of SOC in forest of Guangxi was synthetically influenced by structural and human factors, while the structural factors played a dominant role. It is suggested that expanding the area of natural forests and plantations like Cunninghamia lanceolata while reducing the area of Eucalyptus and certain economic forests like Camellia oleifera will help increase carbon sequestration potential in forest of Guangxi.关键词
土壤有机碳/空间异质性/Kriging/森林类型/广西Key words
soil organic carbon/spatial heterogeneity/Kriging/forest type/Guangxi分类
农业科技引用本文复制引用
宋敏,彭晚霞,徐庆国,曾馥平,杜虎,张浩,曾昭霞..广西不同森林类型土壤有机碳的空间异质性[J].广西植物,2017,37(11):1418-1427,10.基金项目
国家重点研发计划项目(2016YFC0502405) （2016YFC0502405）
国家自然科学基金(31370485,31370623,31400412,31460135) （31370485,31370623,31400412,31460135）
广西科技惠民项目(桂科转1599001-6) （桂科转1599001-6）
广西重点研发计划项目(桂科AB16380255) （桂科AB16380255）
湖南省研究生科研创新项目(CX2015B231)[Sup-ported by the National Key Research and Development Program(2016YFC0502405) （CX2015B231）
Natural Science Foundation of China(31370485,31370623,31400412,31460135) （31370485,31370623,31400412,31460135）
Guangxi Provincial Benefitting Program of Science and Technology(1599001-6) （1599001-6）
Guangxi Key Re-search and Development Program(AB16380255) （AB16380255）
Postgraduate Research and Innovation Program of Hunan Province(CX2015B231)]. （CX2015B231）
