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首页> 外文期刊>The Science of the Total Environment >Impacts of drainage, restoration and warming on boreal wetland greenhouse gas fluxes
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Impacts of drainage, restoration and warming on boreal wetland greenhouse gas fluxes

机译：排水，恢复和变暖对北方湿地温室气体通量的影响

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Northern wetlands with organic soil i.e., mires are significant carbon storages. This key ecosystem service may be threatened by anthropogenic activities and climate change, yet we still lack a consensus on how these major changes affects their carbon sink capacities. We studied how forestry drainage and restoration combined with experimental warming, impacts greenhouse gas fluxes of wetlands with peat. We measured CO2 and CH4 during two and N2O fluxes during one growing season using the chamber method.Gas fluxes were primarily controlled by water table, leaf area and temperature. Land use had a clear impact of on CO2 exchange. Forestry drainage increased respiration rates and decreased field layer net ecosystem CO2 uptake (NEE) and leaf area index (LAI), while at restoration sites the flux rates and LAI had recovered to the level of undrained sites. CH4 emissions were exceptionally low at all sites during our study years due to natural drought, but still somewhat lower at drained compared to undrained sites. Moderate warming triggered an increase in LAI across all land use types. This was accompanied by an increase in cumulative seasonal NEE. Restoration appeared to be an effective tool to return the ecosystem functions of these wetlands as we found no differences in LAI or any gas flux components (PMAX, Reco, NEE, CH4 or N2O) between restored and undrained sites. We did not find any signs that moderate warming would compromise the return of the ecosystem functions related to C sequestration. (C) 2018 Elsevier B.V. All rights reserved.
机译：具有有机土壤（即泥潭）的北部湿地是大量的碳储量。这种关键的生态系统服务可能会受到人为活动和气候变化的威胁，但我们仍未就这些重大变化如何影响其碳汇能力达成共识。我们研究了林业排水和恢复结合实验性变暖如何影响泥炭湿地的温室气体通量。我们使用室法测量了两个通量期间的CO2和CH4以及一个生长季节的N2O通量。气体通量主要受地下水位，叶面积和温度控制。土地使用对CO2交换有明显影响。林业排水增加了呼吸速率，降低了田间层生态系统的净二氧化碳吸收（NEE）和叶面积指数（LAI），而在恢复点，通量率和LAI已恢复到不排水点的水平。在研究期间，由于自然干旱，所有站点的CH4排放量都异常低，但与不排水的站点相比，排水的CH4排放量仍然较低。适度的升温导致所有土地利用类型的LAI增加。随之而来的是季节性NEE的累积增加。恢复似乎是恢复这些湿地生态系统功能的有效工具，因为我们发现恢复和不排水的地点之间的LAI或任何气体通量成分（PMAX，Reco，NEE，CH4或N2O）没有差异。我们没有发现任何迹象表明适度的变暖会损害与固碳有关的生态系统功能的恢复。 （C）2018 Elsevier B.V.保留所有权利。

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