Regional contribution of CO2 and CH4 fluxes from the fluvial network in a lowland boreal landscape of Quebec
Regional contribution of CO2 and CH4 fluxes from the fluvial network in a lowland boreal landscape of Quebec
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DOI：
10.1002/2013gb004685
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发表时间：
2014-01-01
影响因子：
5.2
通讯作者：
del Giorgio, Paul A.
中科院分区：
文献类型：
--
作者：
Campeau, Audrey;Lapierre, Jean-Francois;del Giorgio, Paul A.
北方河流和溪流被认为是二氧化碳排放的热点，但由于空间上的零散数据和缺乏同时处理这两种气体的区域研究，它们对CH4排放的贡献传统上被认为是微不足道的。在这里，我们探索了魁北克北部低地北部地区河流二氧化碳和甲烷浓度(PCO(2)和PCH(4))、气体交换系数(K)以及由此产生的排放的区域模式。河流和溪流在这两种气体中都系统性地过饱和，PCO(2)和PCH(4)都沿着河流连续体下降。平均K值较低，并随着河流的有序排列而增大，这与这一平坦地貌的水文特征相一致。最小的流(阶1)，它代表
Boreal rivers and streams are known as hot spots of CO2 emissions, yet their contribution to CH4 emissions has traditionally been assumed to be negligible, due to the spatially fragmented data and lack of regional studies addressing both gases simultaneously. Here we explore the regional patterns in river CO2 and CH4 concentrations (pCO(2) and pCH(4)), gas exchange coefficient (k), and the resulting emissions in a lowland boreal region of Northern Quebec. Rivers and streams were systematically supersaturated in both gases, with both pCO(2) and pCH(4) declining along the river continuum. The k was on average low and increased with stream order, consistent with the hydrology of this flat landscape. The smallest streams (order 1), which represent