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首页> 外文期刊>Plant and Soil >Exchange of CO2, CH4 and N2O between the atmosphere and two northern boreal ponds with catchments dominated by peatlands or forests
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Exchange of CO2, CH4 and N2O between the atmosphere and two northern boreal ponds with catchments dominated by peatlands or forests

机译：大气和两个北部集水区以泥炭地或森林为主的北方北方池塘之间的CO2，CH4和N2O交换

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摘要

Concentrations of carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) in the water column and their exchange at the water/air interface were studied during the open water period in two freshwater ponds with different catchment characteristics in the northern boreal zone in Finland; either peatlands or coniferous upland forests dominated the catchment of the ponds. Both ponds were supersaturated with dissolved CO2 and CH4 with respect to the equilibrium with the atmosphere, but were close to the equilibrium with N2O. The mean CO2 efflux from the pond was higher in the peatland-dominated catchment (22 mg m(-)2 h(-1)) than in the forested catchment (0.7 mg m(-2) h(-1)), whereas the mean CH4 emissions were similar (7.6 and 3.5 mg m(-2) d(-1), respectively). The fluxes of N2O were generally negligible. The higher CO2 concentrations and efflux in the pond with the peatland-dominated catchment were attributed to a greater input of allochthonous carbon to that pond from its catchment due to its higher water colour and higher total organic carbon (TOC) concentration. The water pH, which also differed between the ponds, could additionally affect the CO2 dynamics. Since the catchment characteristics can regulate aquatic carbon cycles, catchment-scale studies are needed to attain a deeper understanding of the aquatic greenhouse gas dynamics.
机译：研究了北部北方两个集水特征不同的淡水池塘在开放水期中水柱中二氧化碳（CO2），甲烷（CH4）和一氧化二氮（N2O）的浓度及其在水/空气界面的交换情况。芬兰的区域;泥炭地或针叶山地森林主导着池塘的流域。就与大气的平衡而言，两个池塘都充满了溶解的CO2和CH4，但与N2O接近。在泥炭地为主的流域（22 mg m（-）2 h（-1））中，池塘的平均CO2排放量高于森林流域（0.7 mg m（-2）h（-1））。 CH4的平均排放量相似（分别为7.6和3.5 mg m（-2）d（-1））。 N2O的通量通常可以忽略不计。泥炭地为主的集水区池塘中较高的CO2浓度和外排量归因于其池塘中较高的水色和较高的总有机碳（TOC）浓度，从而使该池塘中的异源碳输入量更大。池塘之间的水pH值也有所不同，还会影响CO2动态。由于流域特征可以调节水生碳循环，因此需要对流域规模进行研究，以加深对水生温室气体动力学的了解。

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