Wildfire and degradation accelerate northern peatland carbon release
Wildfire and degradation accelerate northern peatland carbon release
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DOI：
10.1038/s41558-023-01657-w
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发表时间：
2023-04
影响因子：
30.7
通讯作者：
S. Wilkinson;R. Andersen;P. Moore;S. Davidson;G. Granath;J. Waddington
中科院分区：
文献类型：
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作者：
S. Wilkinson;R. Andersen;P. Moore;S. Davidson;G. Granath;J. Waddington
北方泥炭地碳汇对气候调节具有重要作用；然而，碳汇的未来是不确定的，部分原因是泥炭地和野火之间不断变化的相互作用。在这里，我们使用来自非多年冻土寒带和温带地区自然、退化和恢复泥炭地的经验数据集，综合泥炭地退化状况、野火燃烧和火灾后动态，模拟净生态系统交换和甲烷通量。我们发现，野火过程使原始泥炭地的碳吸收量减少了35%，并使退化泥炭地的碳排放量进一步增加了10%。目前的小净汇容易受到泥炭地退化面积、燃烧速率和泥炭燃烧严重程度的相互作用。气候变化的影响加速了碳损失，到2100年，燃烧严重程度和燃烧率的增加分别使碳汇减少了38%和65%。然而，我们的研究表明，积极的泥炭地恢复可以缓冲这些影响。
The northern peatland carbon sink plays a vital role in climate regulation; however, the future of the carbon sink is uncertain, in part, due to the changing interactions of peatlands and wildfire. Here, we use empirical datasets from natural, degraded and restored peatlands in non-permafrost boreal and temperate regions to model net ecosystem exchange and methane fluxes, integrating peatland degradation status, wildfire combustion and post-fire dynamics. We find that wildfire processes reduced carbon uptake in pristine peatlands by 35% and further enhanced emissions from degraded peatlands by 10%. The current small net sink is vulnerable to the interactions of peatland degraded area, burn rate and peat burn severity. Climate change impacts accelerated carbon losses, where increased burn severity and burn rate reduced the carbon sink by 38% and 65%, respectively, by 2100. However, our study demonstrates the potential for active peatland restoration to buffer these impacts.