Role of the aquatic pathway in the carbon and greenhouse gas budgets of a peatland catchment
Role of the aquatic pathway in the carbon and greenhouse gas budgets of a peatland catchment
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DOI：
10.1111/j.1365-2486.2009.02119.x
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发表时间：
2010-10-01
影响因子：
11.6
通讯作者：
Helfter, Carole
中科院分区：
文献类型：
--
作者：
Dinsmore, Kerry J.;Billett, Michael F.;Helfter, Carole
泥炭地流已多次被证明是高度过饱和的CO2和CH 4相对于大气，并结合溶解（DOC）和颗粒有机碳（POC）代表一个潜在的重要途径集水区温室气体（GHG）和碳（C）的损失。本研究的目的是创建一个完整的C和温室气体（CO2，CH 4，N2 O）预算Auchencorth苔藓，在苏格兰南部的湿地泥炭地，结合通量塔，静态室和水生通量测量连续2年。汇/源的集水区的碳和温室气体的强度进行了比较，以评估水生途径的相对重要性。在研究期间（2007-2008年），集水区作为温室气体（352克CO2-Eq m-2年-1）和碳（69.5克C m-2年-1）的净汇。温室气体和碳收支中最大的通量是生态系统净交换量（NEE）。陆地排放的甲烷和氧化亚氮的总和返回只有4%的二氧化碳当量被NEE捕获到大气中，而逃避温室气体从流表面返回12%。DOC代表NEE C吸收的24%的损失，如果处理和逃避下游，集水区以外，可能会导致实际的集水区衍生的温室气体损失的显着低估。预算清楚地显示了水生通量的重要性，在Auchencorth苔藓和强调需要同时考虑碳和温室气体预算。
Peatland streams have repeatedly been shown to be highly supersaturated in both CO2 and CH4 with respect to the atmosphere, and in combination with dissolved (DOC) and particulate organic carbon (POC) represent a potentially important pathway for catchment greenhouse gas (GHG) and carbon (C) losses. The aim of this study was to create a complete C and GHG (CO2, CH4, N2O) budget for Auchencorth Moss, an ombrotrophic peatland in southern Scotland, by combining flux tower, static chamber and aquatic flux measurements from 2 consecutive years. The sink/source strength of the catchment in terms of both C and GHGs was compared to assess the relative importance of the aquatic pathway. During the study period (2007-2008) the catchment functioned as a net sink for GHGs (352 g CO2-Eq m-2 yr-1) and C (69.5 g C m-2 yr-1). The greatest flux in both the GHG and C budget was net ecosystem exchange (NEE). Terrestrial emissions of CH4 and N2O combined returned only 4% of CO2 equivalents captured by NEE to the atmosphere, whereas evasion of GHGs from the stream surface returned 12%. DOC represented a loss of 24% of NEE C uptake, which if processed and evaded downstream, outside of the catchment, may lead to a significant underestimation of the actual catchment-derived GHG losses. The budgets clearly show the importance of aquatic fluxes at Auchencorth Moss and highlight the need to consider both the C and GHG budgets simultaneously.