不同林分土壤B层有机碳密度及影响因素分析

土壤有机碳在很大程度上影响着土壤结构的形成和稳定性,土壤的持水性能和植物营养的生物有效性以及土壤的缓冲性能和土壤生物多样性等。采用多重比较、相关分析等方法,研究了广东省内桉树、马尾松、杉木、阔叶混、针阔混5种主要林分下的土壤B层有机碳密度,结果表明:土壤B层有机碳密度的变化范围在2.06～291.64t/hm2之间,各林分类型B层有机碳密度的大小顺序为:阔叶混>桉树>杉木>针阔混>马尾松。并对土壤B层有机碳密度的主要影响因素进行了分析,为评价不同林分类型的碳汇功能提供参考。

Influencing Factors Analysis on Soil Organic Carbon Density in B Layer of Different Stands

The formation of soil structure and stability,water holding capacity of soil,biodiversity of plant nutrition,soil buffering properties and biodiversity of soil were affected by SOC.The methods of multi-com-parison and correlation analysis were adopted,density of soil organic carbon in B layer of soil of five of Eu-calyptus robusta Smith,P.massoniana Lamb.,cunninghamia lanceo lata（Lamb.）the mixture of broadleaf and conifer-broadleaf stands were studied in Guangdong Province.The results showed that：B layer of soil organic carbon density changes in the range of 2.06～291.64 t/hm2,The sequence of B layer organic car-bon density as follows：mixed broadleaved forestEucalyptus robusta Smith.cunninghamia lanceo lata（Lamb.）coniferous and broadleaved mixed forestP.massoniana Lamb And the main factors influencing the density of soil organic carbon were analyzed for make a reference to the assessment of carbon sink in dif-ferent stands.