Restoring tides to reduce methane emissions in impounded wetlands: A new and potent Blue Carbon climate change intervention.
Restoring tides to reduce methane emissions in impounded wetlands: A new and potent Blue Carbon climate change intervention.
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DOI：
10.1038/s41598-017-12138-4
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发表时间：
2017-09-20
影响因子：
4.6
通讯作者：
Tang J
中科院分区：
文献类型：
--
作者：
Kroeger KD;Crooks S;Moseman-Valtierra S;Tang J
沿海湿地是快速固碳的场所，土壤碳储量大。因此，人们越来越有兴趣将这些生态系统作为人为温室气体排放抵消项目（有时称为“蓝碳”）的场地，通过保护现有的碳储存或创造新的湿地来增加未来的固碳。在这里，我们表明，在全球范围内广泛发生的堤防，蓄水，排水和潮汐限制盐沼，大量的甲烷（CH4）和CO2的排放量减少，可以通过恢复断开盐水潮汐流。模拟的气候强迫表明，潮汐恢复，以减少排放量有一个更大的影响，每单位面积比湿地创造或保护，以加强封存。鉴于潮汐限制、退化湿地的温室气体排放是由人类活动造成的，它们是人为排放，减少它们对气候的影响相当于减少等量化石燃料温室气体的排放。因此，作为一种基于土地利用的气候变化干预措施，减少CH4排放是一个完全不同于生物固碳项目的概念，生物固碳项目旨在增加森林或湿地生物量或土壤中的碳储存，并且不会遭受储存的碳将返回大气的非永久性风险。
Coastal wetlands are sites of rapid carbon (C) sequestration and contain large soil C stocks. Thus, there is increasing interest in those ecosystems as sites for anthropogenic greenhouse gas emission offset projects (sometimes referred to as “Blue Carbon”), through preservation of existing C stocks or creation of new wetlands to increase future sequestration. Here we show that in the globally-widespread occurrence of diked, impounded, drained and tidally-restricted salt marshes, substantial methane (CH4) and CO2 emission reductions can be achieved through restoration of disconnected saline tidal flows. Modeled climatic forcing indicates that tidal restoration to reduce emissions has a much greater impact per unit area than wetland creation or conservation to enhance sequestration. Given that GHG emissions in tidally-restricted, degraded wetlands are caused by human activity, they are anthropogenic emissions, and reducing them will have an effect on climate that is equivalent to reduced emission of an equal quantity of fossil fuel GHG. Thus, as a landuse-based climate change intervention, reducing CH4 emissions is an entirely distinct concept from biological C sequestration projects to enhance C storage in forest or wetland biomass or soil, and will not suffer from the non-permanence risk that stored C will be returned to the atmosphere.
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影响因子：
3.2
作者：
Konisky, Raymond A.;Burdick, David M.;Neckles, Hilary A.
通讯作者：
Neckles, Hilary A.
影响因子：
1.3
作者：
Lee, Jiyoung;An, Soonmo
通讯作者：
An, Soonmo
影响因子：
3.7
作者：
Neubauer, Scott C.;Megonigal, J. Patrick
通讯作者：
Megonigal, J. Patrick
影响因子：
4.9
作者：
Hooijer, A.;Page, S.;Jauhiainen, J.
通讯作者：
Jauhiainen, J.
影响因子：
5.2
作者：
Chmura, GL;Anisfeld, SC;Lynch, JC
通讯作者：
Lynch, JC