Seasonal patterns of greenhouse gas emissions from a forest-to-bog restored site in northern Scotland: Influence of microtopography and vegetation on carbon dioxide and methane dynamics
Seasonal patterns of greenhouse gas emissions from a forest-to-bog restored site in northern Scotland: Influence of microtopography and vegetation on carbon dioxide and methane dynamics
复制标题
苏格兰北部森林到沼泽恢复地点温室气体排放的季节性模式：微地形和植被对二氧化碳和甲烷动态的影响
DOI：
10.1111/ejss.13050
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发表时间：
2020
影响因子：
4.2
通讯作者：
Mazzola V
中科院分区：
文献类型：
--
作者：
Mazzola V
北方泥炭地在调节大气温室气体(GHG)平衡方面发挥着重要作用，是有机分解速率较低的净碳汇。然而，排水等扰动会增加泥炭的氧化，这可能会导致碳的气体释放增加。因此，在过去几年里，旨在恢复毛毯沼泽的恢复项目的数量有所增加，但仍然缺乏对恢复对温室气体排放的影响的了解，例如甲烷，特别是在从林业恢复的地点。本文研究了苏格兰退耕还林还草恢复区的季节温室气体动态。我们分析了恢复对二氧化碳和甲烷通量的影响，并调查了哪些立地因素(微地形、植被类型、土壤湿度和温度)驱动了沼泽表面和大气之间的气体交换过程。结果表明，在−为0.28gCO2eq m2·day−1时，原始地表接近温室气体平衡，微地形特征为净温室气体汇(脊形=−0.94gCO2eq m2·day−1，沟槽=−0.86gCO2eq m2·day−1)，而沼泽池为温室气体净源(0.98gCO2 eq m2·day−1)。我们发现，不同的植被种类在温室气体通量动态中起着关键作用，特别是在林业衍生的微地形特征中，它们的存在和对温室气体动力学的影响应该被考虑到，以便更全面地了解与恢复管理实践相关的排放。退耕还林的北部泥炭地温室气体(CO2和CH4)动态主要受微地形和植被的影响。林业衍生的微形态(垄沟)是比池(温室气体排放者)和原始地表(接近温室气体平衡)更好的温室气体汇。丛生毛霉菌的存在导致更高的CH4排放。像地形形成这样的恢复措施可能会由于 CH4CO2通量的增加而产生短期的脉冲温室气体净排放。
Northern peatlands play an important role in the regulation of the atmospheric greenhouse gas (GHG) balance, functioning as a net carbon sink with low rates of organic decomposition. However, perturbations such as drainage increase peat oxidation, which may lead to enhanced gaseous release of carbon. For this reason, the number of restoration projects that aim to rewet blanket bogs has increased in the last few years, but there is still a lack of understanding of the impact of restoration on emissions of greenhouse gases, such as methane, particularly in sites restored from forestry. In this paper, we investigate the seasonal greenhouse gas dynamics in a forest‐to‐bog restoration site in Scotland. We analyse the effects of restoration on both carbon dioxide and methane fluxes, and investigate which site factors (microtopography, vegetation type, soil moisture and temperature) drive the processes of gaseous exchange between the bog surface and the atmosphere. Our results show that the original surface is near greenhouse gase equilibrium at −0.28 gCO2eq m2·day−1and that microtopographic features act as a net greenhouse gas sink (ridges = −0.94 gCO2eq m2·day−1and furrows = −0.86 gCO2eq m2·day−1), whereas the bog pool is a net source of greenhouse gases (0.98 gCO2eq m2·day−1). We found different vegetation species play a key role in greenhouse gas flux dynamics, especially in forestry‐derived microtopographical features, and their presence and influence on greenhouse gas dynamics should be accounted for to provide a more comprehensive understanding of emissions associated with restoration management practices.HighlightsGHG (CO2and CH4) dynamics in a boreal peatland restored from forestry are mainly affected by microtopography and vegetation.Forestry‐derived microforms (ridges and furrows) are better GHG sinks than pools (GHG emitters) and original surfaces (near GHG equilibrium).The presence ofTrichophorum cespitosumleads to higher CH4emissions.Restoration practices like terraforming may create a short‐term pulse net GHG emission due to an increase of both CH4and CO2fluxes.