The role of wetland expansion and successional processes in methane emissions from northern wetlands during the Holocene
The role of wetland expansion and successional processes in methane emissions from northern wetlands during the Holocene
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DOI：
10.1016/j.quascirev.2021.106864
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发表时间：
2021-04
影响因子：
4
通讯作者：
C. Treat;Miriam C. Jones;L. Brosius;G. Grosse;K. W. Walter Anthony;S. Frolking
中科院分区：
文献类型：
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作者：
C. Treat;Miriam C. Jones;L. Brosius;G. Grosse;K. W. Walter Anthony;S. Frolking
北部高纬度湿地的贡献是整个全新世大气甲烷（CH4）预算的主要不确定性。我们使用基于泥炭起始（> 3600个日期）、泥炭地类型（> 250个泥炭芯）观察的经验模型重建了北部泥炭地自距今13,000年以来的CH4排放，并观察了CH4排放，以探讨晚冰期末和全新世湿地类型变化对CH4排放的影响。距今 8000 年前，随着主要湿地复合体形成沼泽，沼泽面积稳步增加。距今 8000 年后，新的沼泽地继续形成，但发生了广泛的泥炭地演替（到沼泽）和永久冻土加积。由于沼泽的形成和扩张，泥炭地的重建甲烷排放量在距今 10,600 至 6900 年间迅速增加。 5000 BP 后，排放稳定在 42 ± 25 Tg CH4y−1，因为高排放沼泽转变为低排放沼泽和永久冻土泥炭地。距今 1000 年之后，北部泥炭地广泛的永久冻土形成使 CH4 排放量减少了 20%–34 ± 21 Tg y−1，这表明泥炭地 CH4 排放量将随着永久冻土融化而增加。
The contribution from northern high latitude wetlands are a major uncertainty in the atmospheric methane (CH4) budget throughout the Holocene. We reconstructed CH4emissions from northern peatlands from 13,000 BP to present using an empirical model based on observations of peat initiation (>3600 dates), peatland type (>250 peat cores), and observed CH4emissions in order to explore the effects of changes in wetland type on CH4emissions over the end of the late glacial and the Holocene. Fen area increased steadily before 8000 BP as fens formed in major wetland complexes. After 8000 BP, new fen formation continued but widespread peatland succession (to bogs) and permafrost aggradation occurred. Reconstructed CH4emissions from peatlands increased rapidly between 10,600 BP and 6900 BP due to fen formation and expansion. Emissions stabilized after 5000 BP at 42 ± 25 Tg CH4y−1as high-emitting fens transitioned to lower-emitting bogs and permafrost peatlands. Widespread permafrost formation in northern peatlands after 1000 BP decreased CH4emissions by 20%–34 ± 21 Tg y−1by the present day and suggests peatland CH4emissions will increase with permafrost thaw.