结合林木生长周期和森林资源经营模式,设定合理的森林资源利用计划方案,细化林分与优势树种,以材积源生物量测算方法为基础,根据林龄与蓄积的动态变化建立生物量与碳密度的关系模型,分树种、龄级和林分对不同资源利用方案的乔木层地上碳储量及碳汇潜力进行比较估算。结果表明:假定未来50年不进行规模采伐,林木固碳量在2065年将达到8 739.47万t,其中新造林占比71.74%;假定对原有乔木植被中处于碳密度增量较小时段的人工林优势树种进行采伐更新,林木固碳量则将达到8 799.95万t,其中新造林占比73.34%。表明是否采取人工采伐更新方案对于乔木层活立木总固碳量变化不明显,而定期新增林地造林与采伐更新造林能获得较大的固碳贡献,也能保障森林资源的社会经济功能,促进林业经济的发展。

Under the background of the forest resource management mode and tree growth cycle,based on the biomass measurement method of timber volume source and the endogenous relationship of forest age-accumulation,a model of biomass and carbon density was established to compare and explore the aboveground carbon reserves and carbon sink potential of different resource utilization schemes from the perspective of different tree species,age classes and stands.The results show that:(1) assuming no large-scale logging in the next 50 years,the comprehensive carbon sequestration will reach 8,739.47×10⁴t in 2065(the same below),the carbon sequestration in the new afforestation accounted for as 71.74%;(2) on the basis of the existing business model,selective felling or rotational felling of dominant tree species carried out in the plantations with small increment of carbon density in the original forest arbor vegetation,the comprehensive carbon sequestration will reach 8799.95×10⁴t,and the carbon sequestration in the new afforestation accounted for as 73.34%;(3) there is a small difference between the carbon sequestration increment of the living wood that adopts the manual cutting and renewal plan and that does not adopt this plan;(4) the carbon sequestration contribution of new afforestation of regularly increased forestland area is greater,and it can ensure the socio-economic function of forest resources and promote the development of regional forest carbon sink.