鄂西北主要森林类型碳密度特征

Characteristics of the Carbon Density of Main Forest Types in Northwestern Hubei

将鄂西北山区典型森林生态系统划分为13种森林类型,在系统调查样地乔木层、灌木层、枯落物层及土壤层碳含量的基础上,对不同森林类型碳密度进行了估算。结果表明:鄂西北森林生态系统平均碳密度为175.812t·C·hm-2,各层碳密度的大小顺序为土壤层(110.130t·C·hm-2)>乔木层(48.278t·C·hm-2)>灌木层(15.187t·C·hm-2)>枯落物层(2.217t·C·hm-2),各层分别占整个生态系统碳储量的62.64%,27.46%,8.64%和1.26%。天然林不同林龄碳密度排序为近成过熟林>中龄林>幼龄林,人工林不同森林类型碳密度排序为针阔混交林>针叶林>阔叶林。

The typical forest ecosystem of mountainous region of Northwestern Hubei is divided into 13 kinds of forest type. The carbon density of different forest ecosystem was estimated on the basis of the forest plot survey, including arbor layer, shrub layer, litter layer and soil layer. The results showed that the average carbon density of forest ecosystem in mountainous region of Northwestern Hubei was 175. 812 t·C·hm^-2, with 48. 278 t·C·hm^-2 in arbor layer,15. 187 t·C·hm^-2 in shrub layer,2. 217 t ·C·hm^-2 in little layer and 110. 130 t·C·hm^-2 in soil, which accounted for 62. 64%, 27.46%, 8.64% and 1.26% respectively of the entire forest ecosystems. The carbon density of natural forest differed with age. The carbon density of mature forest was the biggest, while the carbon density of middle age forest was bigger than that of young forest. Natural forest carbon density in age sequence was mature forest was the biggest, The middle age forest was bigger than young forest. Different forest types of artificial forest carbon density the biggest was conif- erous and broad-leaved mixed forest, the coniferous forest was bigger than broad-leaved forest.