Warming response of peatland CO2 sink is sensitive to seasonality in warming trends
Warming response of peatland CO2 sink is sensitive to seasonality in warming trends
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DOI：
10.1038/s41558-022-01428-z
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发表时间：
2022-07-28
影响因子：
30.7
通讯作者：
Zaehle, S.
中科院分区：
文献类型：
--
作者：
Helbig, M.;Zivkovic, T.;Zaehle, S.
数千年来，泥炭地一直扮演着二氧化碳净汇的角色，发挥着全球气候降温效应。在拥有丰富泥炭地的北纬地区，气候迅速变暖会扰乱它们的二氧化碳吸收功能。研究表明，泥炭地净CO2交换对变暖的敏感性随季节的变化而变化，导致了复杂的净CO2汇响应。我们利用来自20个北部泥炭地的多年净二氧化碳交换观测结果表明，初夏变暖与二氧化碳净吸收量增加有关，而夏末变暖导致二氧化碳净吸收量减少。因此，在经历初夏变暖的地区，如西伯利亚中部，泥炭地的二氧化碳净汇比其他地区更有可能在更温暖的气候条件下持续存在。我们的结果将有助于改进未来变暖实验的设计，并更好地解释未来几十年泥炭地净二氧化碳吸收的大尺度趋势。泥炭地历来扮演着碳汇的角色，但目前尚不清楚气候变暖将如何影响这一作用。泥炭地碳吸收对变暖的响应取决于夏季变暖的时间；早期变暖导致CO2吸收量增加，后期变暖导致吸收量减少。
Peatlands have acted as net CO2 sinks over millennia, exerting a global climate cooling effect. Rapid warming at northern latitudes, where peatlands are abundant, can disturb their CO2 sink function. Here we show that sensitivity of peatland net CO2 exchange to warming changes in sign and magnitude across seasons, resulting in complex net CO2 sink responses. We use multiannual net CO2 exchange observations from 20 northern peatlands to show that warmer early summers are linked to increased net CO2 uptake, while warmer late summers lead to decreased net CO2 uptake. Thus, net CO2 sinks of peatlands in regions experiencing early summer warming, such as central Siberia, are more likely to persist under warmer climate conditions than are those in other regions. Our results will be useful to improve the design of future warming experiments and to better interpret large-scale trends in peatland net CO2 uptake over the coming few decades.Peatlands have historically acted as a carbon sink, but it is unclear how climate warming will affect this. The response of peatland carbon uptake to warming depends on the timing of summer warming; early warming leads to increased CO2 uptake and later warming to decreased uptake.