广东省珠三角乔木林生物量碳储量评估

Evaluation on Forest Biomass and Carbon Storage in Pearl River Delta in Guangdong Province

基于2017年广东省第九次国家森林资源连续清查数据,以一元胸径模型计算珠三角乔木林单株生物量,通过含碳系数计算乔木林单株碳储量,统计汇总得到样地乔木林生物量和碳储量。研究结果表明,珠三角乔木林每公顷生物量为61.52t/hm^(2),碳密度为29.95t/hm^(2);林分中以中幼林为主,近熟林、成熟林单位面积的生物量和碳密度较高;木荷、马尾松、栎类、阔叶混交林和针阔混交林单位面积生物量和碳密度较高,桉树较低;生物量与碳储量空间分布格局为东西部高、南部低的趋势;单位面积生物量和碳密度随着海拔的增加而增加。建议通过合理优化珠三角城市森林树种结构和龄组结构,加强中幼林抚育以及森林保护力度,持续提高珠三角城市森林碳汇潜力,为珠三角城市森林群建设提升提供指导。

Based on the data of the ninth continuous inventory of forest resources in Guangdong, the single-element diameter at breast height(DBH)model was used to calculate the biomass of arbor forest in the Pearl River Delta.The carbon storage per plant in the arbor forest was calculated by the carbon content coefficient of trees.The biomass and carbon storage of the arbor forest in the sample plot were obtained from statistical summary.The biomass per hectare in the Pearl River Delta was 61.52 t/hm^(2),and the carbon density was 29.95 t/hm^(2).In terms of the forest stands, the middle-aged and young-aged forests were dominant, the near-mature and mature forests had higher biomass and carbon density per unit area;The species of Schima superba,Pinus massoniana,Quercus,mixed broadleaf forests and mixed conifer and broadleaf forests had higher biomass and carbon density per unit area, while the Eucalyptus was lower;The spatial distribution pattern of biomass and carbon storage were high in the east and west and low in the south;And the biomass and carbon density per unit area increased with the increase of altitude.The sustainable carbon sink potential of arbor forests can be improved by adjusting the age structure, optimizing the tree species composition, strengthening the tending of young and middle-aged forests, and forest protection, which can provide guidance for the construction and promotion of forest city cluster in Pearl River Delta.