Divergent responses of permafrost peatlands to recent climate change
Divergent responses of permafrost peatlands to recent climate change
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DOI：
10.1088/1748-9326/abe00b
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发表时间：
2021-03-01
影响因子：
6.7
通讯作者：
Galka, Mariusz
中科院分区：
文献类型：
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作者：
Sim, Thomas G.;Swindles, Graeme T.;Galka, Mariusz
永久冻土泥炭地位于高纬度地区，储存着全球重要的土壤有机碳。这些地区正在以全球平均速度的两倍以上变暖，导致永久冻土融化，并使以前惰性的碳分解并作为温室气体排放到大气中。然而，目前还不清楚泥炭地水文行为，植被结构和碳平衡，以及它们之间的联系，将在气候变暖的永久冻土融化。在这里，我们表明，永久冻土泥炭地遵循不同的生态水文轨迹，以应对最近的气候变化在同一个快速变暖的地区（北方瑞典）。一个地点是变得更湿润还是更干燥取决于当地因素和个别泥炭地的自生反应。我们发现，硼镁石为主的植被表现出抵抗力，在某些情况下，恢复力，气候和水文变化。干燥在四个网站显然与减少固碳，而没有明确的关系，在湿润的网站观察。我们强调了永久冻土泥炭地的复杂动态，并警告在考虑其生态水文轨迹和气候变暖下碳汇的作用时不要采用过于简单的方法。
Permafrost peatlands are found in high-latitude regions and store globally-important amounts of soil organic carbon. These regions are warming at over twice the global average rate, causing permafrost thaw, and exposing previously inert carbon to decomposition and emission to the atmosphere as greenhouse gases. However, it is unclear how peatland hydrological behaviour, vegetation structure and carbon balance, and the linkages between them, will respond to permafrost thaw in a warming climate. Here we show that permafrost peatlands follow divergent ecohydrological trajectories in response to recent climate change within the same rapidly warming region (northern Sweden). Whether a site becomes wetter or drier depends on local factors and the autogenic response of individual peatlands. We find that bryophyte-dominated vegetation demonstrates resistance, and in some cases resilience, to climatic and hydrological shifts. Drying at four sites is clearly associated with reduced carbon sequestration, while no clear relationship at wetting sites is observed. We highlight the complex dynamics of permafrost peatlands and warn against an overly-simple approach when considering their ecohydrological trajectories and role as C sinks under a warming climate.