Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15740 |
Methane production and oxidation potentials along a fen-bog gradient from southern boreal to subarctic peatlands in Finland | |
Hui Zhang; Eeva-Stiina Tuittila; Aino Korrensalo; Anna M. Laine; Salli Uljas; Nina Welti; Johanna Kerttula; Marja Maljanen; David Elliott; Timo Vesala; Annalea Lohila | |
2021-06-28 | |
发表期刊 | Global Change Biology |
出版年 | 2021 |
英文摘要 | Methane (CH4) emissions from northern peatlands are projected to increase due to climate change, primarily because of projected increases in soil temperature. Yet, the rates and temperature responses of the two CH4 emission-related microbial processes (CH4 production by methanogens and oxidation by methanotrophs) are poorly known. Further, peatland sites within a fen-bog gradient are known to differ in the variables that regulate these two mechanisms, yet the interaction between peatland type and temperature lacks quantitative understanding. Here, we investigated potential CH4 production and oxidation rates for 14 peatlands in Finland located between c. 60 and 70°N latitude, representing bogs, poor fens, and rich fens. Potentials were measured at three different temperatures (5, 17.5, and 30℃) using the laboratory incubation method. We linked CH4 production and oxidation patterns to their methanogen and methanotroph abundance, peat properties, and plant functional types. We found that the rich fen-bog gradient-related nutrient availability and methanogen abundance increased the temperature response of CH4 production, with rich fens exhibiting the greatest production potentials. Oxidation potential showed a steeper temperature response than production, which was explained by aerenchymous plant cover, peat water holding capacity, peat nitrogen, and sulfate content. The steeper temperature response of oxidation suggests that, at higher temperatures, CH4 oxidation might balance increased CH4 production. Predicting net CH4 fluxes as an outcome of the two mechanisms is complicated due to their different controls and temperature responses. The lack of correlation between field CH4 fluxes and production/oxidation potentials, and the positive correlation with aerenchymous plants points toward the essential role of CH4 transport for emissions. The scenario of drying peatlands under climate change, which is likely to promote Sphagnum establishment over brown mosses in many places, will potentially reduce the predicted warming-related increase in CH4 emissions by shifting rich fens to Sphagnum-dominated systems. |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/333702 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Hui Zhang,Eeva-Stiina Tuittila,Aino Korrensalo,et al. Methane production and oxidation potentials along a fen-bog gradient from southern boreal to subarctic peatlands in Finland[J]. Global Change Biology,2021. |
APA | Hui Zhang.,Eeva-Stiina Tuittila.,Aino Korrensalo.,Anna M. Laine.,Salli Uljas.,...&Annalea Lohila.(2021).Methane production and oxidation potentials along a fen-bog gradient from southern boreal to subarctic peatlands in Finland.Global Change Biology. |
MLA | Hui Zhang,et al."Methane production and oxidation potentials along a fen-bog gradient from southern boreal to subarctic peatlands in Finland".Global Change Biology (2021). |
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