Carbon loss from boreal forest wildfires offset by increased dominance of deciduous trees

doi:10.1126/science.abf3903

GSTDTAP > 气候变化

DOI	10.1126/science.abf3903
	Carbon loss from boreal forest wildfires offset by increased dominance of deciduous trees
	Michelle C. Mack; Xanthe J. Walker; Jill F. Johnstone; Heather D. Alexander; April M. Melvin; Mélanie Jean; Samantha N. Miller
	2021-04-16
发表期刊	Science
出版年	2021
英文摘要	Wildfire activity has been increasing in the boreal forests of the Northern Hemisphere, releasing carbon into the atmosphere from biomass and soil, with potential feedback to climate warming. In a long-term study, Mack et al. analyzed wildfire impacts on the carbon balance of boreal forest in Alaska, with particular focus on forest-regeneration patterns. After fire, the species composition in most of the study sites changed from black spruce to a mixture of conifers and deciduous broadleaf tree species. The stands that had shifted to deciduous dominance stored fivefold more soil carbon than stands that returned to black spruce dominance. Therefore, the functional traits of deciduous trees compensated for the combustion loss of soil carbon, pointing to a potential mitigation of the feedback effect of boreal forest fire to climate warming. Science , this issue p. [280][1] In boreal forests, climate warming is shifting the wildfire disturbance regime to more frequent fires that burn more deeply into organic soils, releasing sequestered carbon to the atmosphere. To understand the destabilization of carbon storage, it is necessary to consider these effects in the context of long-term ecological change. In Alaskan boreal forests, we found that shifts in dominant plant species catalyzed by severe fire compensated for greater combustion of soil carbon over decadal time scales. Severe burning of organic soils shifted tree dominance from slow-growing black spruce to fast-growing deciduous broadleaf trees, resulting in a net increase in carbon storage by a factor of 5 over the disturbance cycle. Reduced fire activity in future deciduous-dominated boreal forests could increase the tenure of this carbon on the landscape, thereby mitigating the feedback to climate warming. [1]: /lookup/doi/10.1126/science.abf3903
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/322897
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Michelle C. Mack,Xanthe J. Walker,Jill F. Johnstone,et al. Carbon loss from boreal forest wildfires offset by increased dominance of deciduous trees[J]. Science,2021.
APA	Michelle C. Mack.,Xanthe J. Walker.,Jill F. Johnstone.,Heather D. Alexander.,April M. Melvin.,...&Samantha N. Miller.(2021).Carbon loss from boreal forest wildfires offset by increased dominance of deciduous trees.Science.
MLA	Michelle C. Mack,et al."Carbon loss from boreal forest wildfires offset by increased dominance of deciduous trees".Science (2021).