基于森林资源清查资料分析山东省森林立木碳储量

Carbon storage of forest stands in Shandong Province estimated by forestry inventory data

利用山东省第7次森林资源清查数据,采用生物量-蓄积量转换函数和平均生物量法,结合不同树种的含碳率,研究山东省森林生态系统立木碳储量、碳密度及其按优势树种、龄组和林种的分布特征.结果表明:2007年山东省森林立木碳储量为25.27 Tg,其中,针叶林、针阔混交林和阔叶林的立木碳储量分别占全省立木碳储量的8.6%、2.0%和89.4%.不同林龄组的立木碳储量大小顺序为幼龄林>中龄林>成熟林>近熟林>过熟林,其中幼龄林和中龄林占全省立木总碳储量的69.3%.用材林、经济林和防护林的立木碳储量分别占全省立木碳储量的37.1%、36.3%和24.8%.山东省森林平均立木碳密度为10.59 t·hm-2,低于全国平均水平,主要是由于现有森林用材林和经济林比重高,中幼林多、成过熟林少.

Based on the 7th forestry inventory data of Shandong Province, this paper estimated the carbon storage and carbon density of forest stands, and analyzed their distribution characteristics ac- cording to dominant tree species, age groups and forest category using the volume-derived biomass method and average-biomass method. In 2007, the total carbon storage of the forest stands was 25.27 Tg, of which the coniferous forests, mixed conifer broad-leaved forests, and broad-leaved forests accounted for 8.6% , 2.0% and 89.4% , respectively. The carbon storage of forest age groups followed the sequence of young forests 〉 middle-aged forests 〉 mature forests 〉 near-mature forests 〉 over-mature forests. The carbon storage of young forests and middle-aged forests accounted for 69.3% of the total carbon storage. Timber forest, non-timber product forest and protection for- ests accounted for 37.1%, 36.3% and 24.8% of the total carbon storage, respectively. The aver- age carbon density of forest stands in Shandong Province was 10.59 t·hm-2, which was lower than the national average level. This phenomenon was attributed to the imperfect structure of forest types and age groups, i. e. , the notably higher percentage of timber forests and non-timber product forest and the excessively higher percentage of young forests and middle-aged forest than mature forests.