Modeling Holocene Peatland Carbon Accumulation in North America

Modeling Holocene Peatland Carbon Accumulation in North America
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模拟北美全新世泥炭地碳积累

DOI:
10.1029/2019jg005230
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发表时间:
2020
期刊:
Journal of Geophysical Research: Biogeosciences
影响因子:
--
通讯作者:
Bridgham, Scott
Bridgham, Scott
中科院分区:
--
文献类型:
--
作者:
Zhuang, Qianlai;Wang, Sirui;Zhao, Bailu;Aires, Filipe;Prigent, Catherine;Yu, Zicheng;Keller, Jason K.;Bridgham, Scott

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泥炭地是一个巨大的碳库。然而,由于缺乏观测数据和经过充分测试的泥炭地地球化学模型,其碳储量的量化仍然具有很大的不确定性。在这里,基于过程的泥炭地模型使用北美多个地点的长期泥炭碳积累数据进行校准。然后,该模型被应用于量化北美过去12,000年的泥炭碳积累速率和储量。我们估计,85-174 Pg碳积累在北美泥炭地在研究期间,包括0.37-0.76 Pg碳在亚热带泥炭地。在10,000年至8,000年前的这段时间里,温暖和潮湿的条件可能通过增强植物光合作用在刺激泥炭碳积累方面发挥了重要作用。由于气候变暖,泥炭分解加快,减缓了整个全新世的碳积累。虽然最近的模拟研究表明,北方泥炭地将继续作为碳汇在本世纪,我们的研究表明,未来增强泥炭分解伴随着泥炭地面积变化引起的冻土退化和其他干扰混淆汇和源分析。
Peatlands are a large carbon reservoir. Yet the quantification of their carbon stock still has a large uncertainty due to lacking observational data and well‐tested peatland biogeochemistry models. Here, a process‐based peatland model was calibrated using long‐term peat carbon accumulation data at multiple sites in North America. The model was then applied to quantify the peat carbon accumulation rates and stocks within North America over the last 12,000 years. We estimated that 85–174 Pg carbon was accumulated in North American peatlands over the study period including 0.37–0.76 Pg carbon in subtropical peatlands. During the period from 10,000 to 8,000 years ago, the warmer and wetter conditions might have played an important role in stimulating peat carbon accumulation by enhancing plant photosynthesis. Enhanced peat decomposition due to warming slowed the carbon accumulation through the rest of the Holocene. While recent modeling studies indicate that the northern peatlands will continue to act as a carbon sink in this century, our studies suggest that future enhanced peat decomposition accompanied by peatland areal changes induced by permafrost degradation and other disturbances shall confound the sink and source analysis.
全新世晚期植被、气候和土地利用对佛罗里达大沼泽地碳动态的影响
DOI: --
发表时间: 2014
期刊:
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发表时间: 2011
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北方泥炭地溶解有机碳的不稳定性:永久冻土融化、野火和季节之间的相互作用1
DOI: 10.1139/cjss-2019-0154
发表时间: 2020
影响因子: 1.7
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