Georgia Institute of Technology, Atlanta, GA, USA.
University of Maine, Orono, ME, USA.
Sci Adv. 2020 Mar 25;6(13):eaay6792. doi: 10.1126/sciadv.aay6792. eCollection 2020 Mar.
There is a continuing debate over the role that woody bioenergy plays in climate mitigation. This paper clarifies this controversy and illustrates the impacts of woody biomass demand on forest harvests, prices, timber management investments and intensity, forest area, and the resulting carbon balance under different climate mitigation policies. Increased bioenergy demand increases forest carbon stocks thanks to afforestation activities and more intensive management relative to a no-bioenergy case. Some natural forests, however, are converted to more intensive management, with potential biodiversity losses. Incentivizing both wood-based bioenergy and forest sequestration could increase carbon sequestration and conserve natural forests simultaneously. We conclude that the expanded use of wood for bioenergy will result in net carbon benefits, but an efficient policy also needs to regulate forest carbon sequestration.
关于木质生物能源在气候缓解方面所扮演的角色,一直存在争议。本文阐明了这一争议,并说明了木质生物质需求对森林采伐、价格、木材管理投资和强度、森林面积以及不同气候缓解政策下的碳平衡的影响。与无生物能源的情况相比,由于造林活动和更集约的管理,生物能源需求的增加增加了森林碳储量。然而,一些天然林被转化为更集约的管理,可能会导致生物多样性的丧失。同时激励基于木材的生物能源和森林固碳,可以增加碳固存并保护天然林。我们的结论是,扩大木材用于生物能源的使用将带来净碳效益,但有效的政策还需要调节森林碳固存。