Regional fire–greening positive feedback loops in Alaskan Arctic tundra

IF 15.8 1区 生物学 Q1 PLANT SCIENCES Nature Plants Pub Date : 2024-11-08 DOI:10.1038/s41477-024-01850-5
Dong Chen, Cheng Fu, Liza K. Jenkins, Jiaying He, Zhihao Wang, Randi R. Jandt, Gerald V. Frost, Allison Bredder, Logan T. Berner, Tatiana V. Loboda
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Abstract

Arctic tundra has experienced rapid warming, outpacing global averages, leading to significant greening whose primary drivers include widespread shrubification. Here we confirm that a fire–greening positive feedback loop is evident across the Alaskan tundra, and evidence suggests that this feedback loop is dominated by the fire–shrub interactions. We show that tundra wildfires, especially those with higher severity, play a critical role in boosting the overall greening of the tundra, often by enhancing upright deciduous shrub growth or establishment but sometimes by inducing increases in other vascular biomass. In addition, fire–greening interactions vary greatly within different tundra subregions, a likely consequence of the spatial heterogeneity in vegetation composition, climatic and geophysical conditions.

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阿拉斯加北极苔原的区域火灾-绿化正反馈回路
北极苔原经历了快速变暖,其速度超过了全球平均水平,导致了显著的绿化,其主要驱动因素包括大范围的灌木化。在这里,我们证实阿拉斯加苔原明显存在火灾-绿化正反馈循环,而且有证据表明,火灾-灌木相互作用主导了这一反馈循环。我们的研究表明,苔原野火,尤其是那些严重程度较高的野火,在促进苔原整体绿化方面发挥着至关重要的作用,通常是通过促进直立落叶灌木的生长或建立,但有时也通过诱导其他维管生物量的增加。此外,在不同的苔原次区域内,火灾与绿化的相互作用差异很大,这可能是植被组成、气候和地球物理条件的空间异质性造成的。
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来源期刊
Nature Plants
Nature Plants PLANT SCIENCES-
CiteScore
25.30
自引率
2.20%
发文量
196
期刊介绍: Nature Plants is an online-only, monthly journal publishing the best research on plants — from their evolution, development, metabolism and environmental interactions to their societal significance.
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