Methane and carbon dioxide dynamics within four vernal pools in Maine, USA
Methane and carbon dioxide dynamics within four vernal pools in Maine, USA
复制标题
美国缅因州四个春季池内的甲烷和二氧化碳动态
DOI：
10.1007/s10533-018-0467-5
复制
发表时间：
2018
期刊：
影响因子：
4
通讯作者：
A. Amirbahman
中科院分区：
文献类型：
--
作者：
Lydia H. Kifner;A. Calhoun;S. Norton;Kristine Hoffmann;A. Amirbahman
春池是小型的季节性湿地，是北美东北部森林的常见景观特征，有助于生物多样性。关于其生物地球化学功能的基本信息，如碳循环，是有限的。2016年4月至8月，在美国缅因州中部和东部的四个春季水池的底部和表面每周监测溶解甲烷（CH 4）和二氧化碳（CO2）的浓度以及其他水化学参数。春季池相对于CH 4和CO2在所有采样日期和地点的过饱和。溶解的CH 4和CO2浓度分别为0.4 - 210 μmol L−1和72-2300 μmol L−1。CH 4和CO2向大气的扩散通量分别为0.2 - 73 mmol m−2 d−1和30-590 mmol m−2 d−1。在研究期间，四个春季池分别以CH 4和CO2的形式排放了0.1-5.8 kg C m−2和9.6-120 kg C m−2。CH 4和CO2的生产通量（按表面积标准化的生产率）分别为-0.02至0.66和0.40至4.6 g C m−2 d−1，并在整个季节显著增加。甲烷浓度最好预测碱度，正磷酸盐和深度，而CO2浓度最好预测只有碱度。碱度作为一个预测变量突出的重要性，厌氧呼吸生产的两种气体。我们的研究池有较大的浓度和排放量的CH 4和CO2相比，永久淹没的湿地，表明春季池代谢活跃的网站，可能是全球碳预算的重要贡献者。
Vernal pools are small, seasonal wetlands that are a common landscape feature contributing to biodiversity in northeastern North American forests. Basic information about their biogeochemical functions, such as carbon cycling, is limited. Concentrations of dissolved methane (CH4) and carbon dioxide (CO2) and other water chemistry parameters were monitored weekly at the bottom and surface of four vernal pools in central and eastern Maine, USA, from April to August 2016. The vernal pools were supersaturated with respect to CH4 and CO2 at all sampling dates and locations. Concentrations of dissolved CH4 and CO2 ranged from 0.4 to 210 μmol L−1 and 72–2300 μmol L−1, respectively. Diffusive fluxes of CH4 and CO2 into the atmosphere ranged from 0.2 to 73 mmol m−2 d−1, and 30–590 mmol m−2 d−1, respectively. During the study period, the four vernal pools emitted 0.1–5.8 kg C m−2 and 9.6–120 kg C m−2 as CH4 and CO2, respectively. The production fluxes (production rates normalized to surface area) of CH4 and CO2 ranged from − 0.02 to 0.66 and 0.40–4.6 g C m−2 d−1, respectively, and increased significantly over the season. Methane concentrations were best predicted by alkalinity, ortho-phosphate and depth, while CO2 concentrations were best predicted with only alkalinity. Alkalinity as a predictor variable highlights the importance of anaerobic respiration in production of both gases. Our study pools had large concentrations and effluxes of CH4 and CO2 compared to permanently inundated wetlands, indicating vernal pools are metabolically active sites and may be important contributors to the global carbon budget.
影响因子：
6.6
作者：
Nakagawa, Shinichi;Schielzeth, Holger
通讯作者：
Schielzeth, Holger