Pre-Fire Vegetation Conditions and Topography Shape Burn Mosaics of Siberian Tundra Fire Scars

IF 3.7 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
N. Rietze, R. J. Heim, E. Troeva, G. Schaepman-Strub, J. J. Assmann
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Abstract

The fire season of 2020 in Siberia set a precedent for extreme wildfires in the Arctic tundra. Recent estimates indicated that the 2020 fires contributed 66% of the region's burned area over the last two decades. These fires burned in the carbon-rich permafrost landscape, releasing vast amounts of carbon, and changing land surface processes by burning vegetation and organic soils. However, little is known about the mosaics of burned and unburned patches formed by tundra fires and the underlying processes that generate them. In this study, we investigated six fire scars in the northeastern Siberian tundra using high-resolution PlanetScope imagery (3 m) to map burned fraction within the scars. We then used Bayesian mixed models to identify which biotic and abiotic predictors influenced the burned fraction. We observed high spatial variation in burned fraction across all tundra landforms common to the region. Current medium-resolution fire products could not capture this heterogeneity, thereby underestimating the burned area of fire scars by a factor of 1.2–4.7. The heterogeneity of the burn mosaic indicates a mix of burned and unburned patches, with median unburned patch sizes ranging between 189 and 288 m2 per fire scar. Pre-fire land surface temperature, vegetation heterogeneity and topography predicted burned fraction in our analysis, matching factors previously shown to influence large-scale fire occurrence in the Arctic. Future studies need to consider the fine-scale heterogeneity within tundra landscapes to improve our understanding and predictions of fire spread, carbon emissions, post-fire recovery and ecosystem functioning.

Abstract Image

西伯利亚冻土带火痕的火灾前植被条件和地形形状烧伤马赛克
2020年西伯利亚的火灾季节为北极冻土带的极端野火开创了先例。最近的估计表明,在过去20年里,2020年的大火占该地区烧毁面积的66%。这些大火在富含碳的永久冻土中燃烧,释放出大量的碳,并通过燃烧植被和有机土壤改变了陆地表面的过程。然而,人们对冻土带火灾形成的燃烧和未燃烧斑块的马赛克以及产生它们的潜在过程知之甚少。在这项研究中,我们使用高分辨率PlanetScope图像(3米)调查了东北西伯利亚冻土带的六个火灾疤痕,以绘制疤痕内的烧伤部分。然后,我们使用贝叶斯混合模型来确定哪些生物和非生物预测因素影响燃烧分数。我们观察到该地区所有常见的冻土带地貌中燃烧分数的空间差异很大。目前的中等分辨率火灾产品无法捕捉到这种异质性,因此低估了火灾疤痕的烧伤面积,其系数为1.2-4.7。烧伤马赛克的异质性表明了烧伤斑块和未烧伤斑块的混合,每个火灾疤痕的未烧伤斑块的中位数大小在189 - 288 m2之间。在我们的分析中,火灾前的地表温度、植被异质性和地形预测了燃烧比例,与之前显示的影响北极大规模火灾发生的因素相匹配。未来的研究需要考虑冻土带景观的精细尺度异质性,以提高我们对火灾蔓延、碳排放、火灾后恢复和生态系统功能的理解和预测。
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来源期刊
Journal of Geophysical Research: Biogeosciences
Journal of Geophysical Research: Biogeosciences Earth and Planetary Sciences-Paleontology
CiteScore
6.60
自引率
5.40%
发文量
242
期刊介绍: JGR-Biogeosciences focuses on biogeosciences of the Earth system in the past, present, and future and the extension of this research to planetary studies. The emerging field of biogeosciences spans the intellectual interface between biology and the geosciences and attempts to understand the functions of the Earth system across multiple spatial and temporal scales. Studies in biogeosciences may use multiple lines of evidence drawn from diverse fields to gain a holistic understanding of terrestrial, freshwater, and marine ecosystems and extreme environments. Specific topics within the scope of the section include process-based theoretical, experimental, and field studies of biogeochemistry, biogeophysics, atmosphere-, land-, and ocean-ecosystem interactions, biomineralization, life in extreme environments, astrobiology, microbial processes, geomicrobiology, and evolutionary geobiology
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