华南地区主要造林树种林分碳储量估算

Estimation of Stand Carbon Storage of Main Afforestation Tree Species in South China

研究52个乔木树种纯林的碳储量,分析其固碳能力差异,为碳汇造林选用乔木树种提供参考依据。以广东省东江林场11年生的乔木树种试验林为研究对象,测定52个树种生长量和树干、树枝和树叶的含碳率。按照平均木法,算出平均木生物量,结合平均含碳率、林分密度与保存率,估算碳储量。结果表明,不同树种林分碳储量差异极大,最高碳储量(厚荚相思Acacia farnesiana)比最低碳储量(紫玉兰Magnolia liliiflora)相差约20倍,年均碳储量在10 t/hm2以上的树种有含羞草科的厚荚相思、大叶相思A. auriculiformis等5个树种,年均碳储量在5～10 t/hm2的有灰木莲Manglietia glanca、红荷Schima wallichii等18个树种。以保存率和单位面积碳储量2个主要性状作聚类分析,可将52个树种按固碳能力划分成4种类型的碳汇树种。

Pure forest carbon storage of 52 tree species were studied and their carbon sink capacity differences were analyzed to provide a reference for the selection of tree species for carbon sink afforestation. Taking 11-year-old tree species experimental forest in Dongjiang Forest Farm of Guangdong province as the research object, the growth, the carbon content of trunk, branches and leaves, water content , wood basic density of 52 tree species were measured. According to mean sample-tree method, the mean sample-tree of each tree species was obtained first, and then the mean sample-tree biomass was estimated by the general biomass model of the whole tree. The average carbon content of tree species was calculated by the weighted method. Finally, the carbon storage of 52 tree species pure forest were estimated by combining afforestation density with survival rate. The results showed that there were great differences in carbon storage among tree species. The highest carbon storage tree species (Acacia farnesiana) was about 20 times higher than the lowest carbon storage tree species (Magnolia liliiflora). Average annual carbon storage of pure forest more than 10 t/ha was Acacia farnesiana and Acacia auriculiformis etc. There were 18 species including such as Manglietia glanca, Schima wallichii,etc. with an average annual carbon storage of 5-10 t/hm2. 52 tree species could be classified into 4 types of carbon tree species according to their carbon sequestration capacity and preservation rate.