Neotropical peatland methane emissions along a vegetation and biogeochemical gradient.
Neotropical peatland methane emissions along a vegetation and biogeochemical gradient.
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DOI：
10.1371/journal.pone.0187019
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Richardson CJ
中科院分区：
文献类型：
--
作者：
Winton RS;Flanagan N;Richardson CJ
热带湿地被认为是大气甲烷（CH 4）浓度年际变化的最重要来源，但稀疏的数据阻止它们被纳入地球系统模型。这一问题在新热带地区尤为突出，在新热带地区，基于地下水位深度的自下而上的模型与自上而下的反演模型不一致，表明CH 4的汇或源不明。新记录的泥炭地在亚马逊流域的广大地区可能占一个重要的未被承认的甲烷源，但水文和地球化学控制的甲烷动力学从这些系统仍然知之甚少。我们研究了三个区的泥炭地在马德雷德迪奥斯，秘鲁，以测试是否甲烷排放量和孔隙水浓度随植被群落，土壤化学和接近地下水源。我们发现，开放式冠层草本区排放的CH 4约为三分之一的棕榈占主导地位的地区（4.7 ± 0.9和14.0 ± 2.4毫克CH 4 m-2 h-1，分别）。排放量下降，从地下水排放的距离在三个采样点，并跟踪土壤碳化学的变化，特别是增加土壤酚类。根据所有可用数据，我们计算出新热带泥炭地的排放量为43 ± 11.9 Tg CH 4 y-1，但这一估计值受到地理偏差的影响，一旦发表更多研究，将需要修订。
Tropical wetlands are thought to be the most important source of interannual variability in atmospheric methane (CH4) concentrations, yet sparse data prevents them from being incorporated into Earth system models. This problem is particularly pronounced in the neotropics where bottom-up models based on water table depth are incongruent with top-down inversion models suggesting unaccounted sinks or sources of CH4. The newly documented vast areas of peatlands in the Amazon basin may account for an important unrecognized CH4 source, but the hydrologic and biogeochemical controls of CH4 dynamics from these systems remain poorly understood. We studied three zones of a peatland in Madre de Dios, Peru, to test whether CH4 emissions and pore water concentrations varied with vegetation community, soil chemistry and proximity to groundwater sources. We found that the open-canopy herbaceous zone emitted roughly one-third as much CH4 as the Mauritia flexuosa palm-dominated areas (4.7 ± 0.9 and 14.0 ± 2.4 mg CH4 m-2 h-1, respectively). Emissions decreased with distance from groundwater discharge across the three sampling sites, and tracked changes in soil carbon chemistry, especially increased soil phenolics. Based on all available data, we calculate that neotropical peatlands contribute emissions of 43 ± 11.9 Tg CH4 y-1, however this estimate is subject to geographic bias and will need revision once additional studies are published.
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DOI：
10.1080/03067318908026878
发表时间：
1989-01-01
影响因子：
2.6
作者：
KAMPBELL, DH;WILSON, JT;VANDEGRIFT, SA
通讯作者：
VANDEGRIFT, SA
影响因子：
1.8
作者：
Lawson, I. T.;Kelly, T. J.;Wheeler, J.
通讯作者：
Wheeler, J.
影响因子：
56.9
作者：
Bloom, A. Anthony;Palmer, Paul I.;Frankenberg, Christian
通讯作者：
Frankenberg, Christian
影响因子：
4.4
作者：
BARTLETT, KB;CRILL, PM;MELACK, JM
通讯作者：
MELACK, JM
影响因子：
4
作者：
Belger, Lauren;Forsberg, Bruce R.;Melack, John M.
通讯作者：
Melack, John M.