百山祖国家公园公益林碳储量及分配特征

Carbon storage and its spatial distribution of public welfare forest in Baishanzu National Park

探讨区域尺度的碳储量及其空间分布特征,评估优势树种(组)的固碳能力,可为生态系统保护措施的制定提供数据参考。百山祖国家公园保存了我国东南沿海最为典型完整的中亚热带森林生态系统,但百山祖公园碳密度和碳储量的特征还不清楚。本研究以百山祖国家公园公益林为对象,利用森林资源一类清查数据,基于浙江省各优势树种(组)的相容性生物量方程,研究了不同优势树种(组)的碳密度、碳储量及其在不同区域的空间分布特征。结果表明:百山祖国家公园公益林乔木层的平均碳密度为58.12 t·hm^(-2),碳储量为2088250.4 t;在优势树种(组)中,黄山松林、阔叶混交林和针阔混交林的碳密度分别为65.36、60.64和67.27 t·hm^(-2),而软阔叶林和竹林的碳密度仅为29.23和16.12 t·hm^(-2);幼龄林、中龄林、近熟林、成熟林和过熟林的碳储量占总碳储量的比例分别为17. 42%、16.10%、19.41%、39. 10%和7. 97%;就碳密度分布特征而言,庆元县的碳密度为62. 16t·hm-2,比龙泉市和景宁县的碳密度高7.02%和125.87%;在空间上表现为北部、中部和西南部较高,而东部相对较低;总体来看,在百山祖公国家公园中,中幼林的碳储量占总碳储量的33.52%,在生态系统保护措施中应加强中幼林抚育,提高森林固碳能力。

Understanding carbon storage and its spatial distribution characteristics of public welfare forest at the regional scale and estimating the carbon sequestration capacity of dominant tree species (groups) can provide reference for policymaking of ecosystem conservation.Baishanzu National Park preserves the most typical and integrated mid-subtropical forest ecosystem in the southeast coast of China.The carbon density and carbon storage characteristics,however,are unknown.The carbon density,carbon storage and its spatial distribution at different regions were evaluated by using compatibility biomass model and carbon conversion coefficient suitable for the dominated tree species (groups) based on continuous forest inventory data involved in the public welfare forests in Baishanzu National Park.The results showed that the average carbon density in tree layer of the public welfare forests was 58.12 t·hm^(-2)and carbon storage was 2088250.4 t.The carbon density of Pinus taiwanensis forest,mixed broadleaved forest,and mixed coniferous and broadleaved forest was 65.36,60.64,and 67.27 t·hm^(-2),while the carbon density of softwood forest and Phyllostachys edulis forest was 29.23 and 16.12 t·hm^(-2),respectively.The proportions of carbon storage at the different age groups of young,middle-aged,pre-mature,mature,and over-mature forests to total carbon storage were 17.42%,16.10%,19.41%,39.10%and 7.97%,respectively.Among different regions in Baishanzu National Park,carbon density at Qingyuan County was 62.16 t·hm-2,which was 7.02%and 125.87%higher than that of Longquan City and Jingning County,respectively.Furthermore,the higher carbon density was mainly distributed in the north,middle,and southwest region,while the lower carbon density was distributed in the east region.The young and middle-aged forests accounted for 33.52%of total carbon storage.Therefore,we should strengthen the tending of young and middle-aged forests to improve carbon sequestration capacity of forests during ecosystem conservation.