基于第九次森林资源清查的云南森林碳储量特征研究

Characteristics of Forest Carbon Storage in Yunnan Based on the Ninth Forest Inventory Data

系统估算云南省森林植被的碳储量和碳密度,为研究区域尺度的森林碳储量提供科学依据。以云南第9次森林资源清查数据为基础,采用生物量-蓄积量转换模型法和平均生物量法,结合不同树种的含碳率,分析乔木林中不同优势树种、林种、起源和龄组的碳储量分布特征。结果表明:1)云南不同森林类型的总碳储量为1.05×10^(9)t,平均碳密度44.96 t·hm^(-2);2)乔木林中不同龄组的总碳储量大小排序为幼龄林>中龄林>近熟林>成熟林>过熟林;3)云南省天然乔木林碳储量为9.07×10^(8)t,占乔木林总碳储量的90.76%;4)天然林的平均碳密度为62.44 t·hm^(-2),近人工林的3倍。云南省森林碳储量、碳密度与林龄结构和起源关系密切,表现出森林碳密度随林龄增长而增加,森林碳储量随林龄增长而减少的趋势,天然林碳密度和碳储量均远远大于人工林,该研究为区域尺度的森林碳储量提供了科学依据。

The objective of this study was to systematically estimate the carbon storage and carbon density of forest vegetation in Yunnan Province based on the accurate data to provide scientific basis for the study of forest carbon storage in regional scale.The ninth inventory of forest resources in Yunnan Province was used as the basic data source.The biomass-volume conversion model and the average biomass method were adopted.Combined with the the carbon contents of different tree species,the distribution characteristics of the carbon storage of different dominant tree species,forest species,origin and age groups were analyzed.1)The total carbon storage of different forest types in Yunnan was 1.05×10^(9)t,and the average carbon density was 44.96 t·hm^(-2).2)The total carbon storage of different age groups in arbor forest occurred in the order of young forest>middle age forest>near mature forest>mature forest>overmature forest.3)The carbon storage of natural forest in Yunnan was 9.07×10^(8)t,contributing 90.76%to the total carbon storage of the forest.4)The average carbon density of natural forest was 62.44 t·hm^(-2),which was about three times of that of plantation forest.The forest carbon storage and carbon density are closely related to forest age structure in Yunnan,and forest carbon density increases with the increase of forest age.In addition,the carbon storage and carbon density of natural forests are much higher than that of plantation.This study provides a scientific basis for forest carbon storage at regional scale.