Methane Dynamics in Northern Peatlands: A Review

作     者：D. Y. F. LAI D. Y. F. LAI Department of Geography, McGill University, 805 Sherbrooke Street West, Montreal, Quebec, H3A 2K6 (Canada)

作者机构：Department of Geography McGill University 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2009年第19卷第4期

页      面：409-421页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：Project supported by the Canadian Carbon Program (Fluxnet-Canada Research Network) funded by the Canadian Foundation for Climate and Atmospheric Sciences (CFCAS) a Natural Sciences and Engineering Research Councilof Canada (NSERC) Discovery Grant to Nigel Roulet 

主　　题：global carbon cycle greenhouse gas methane oxidation methanogenesis methanotrophy 

摘      要：Northern peatlands store a large amount of carbon and play a significant role in the global carbon cycle. Owing to the presence of waterlogged and anaerobic conditions, peatlands are typically a source of methane (CH4), a very potent greenhouse gas. This paper reviews the key mechanisms of peatland CH4 production, consumption and transport and the major environmental and biotic controls on peatland CH4 emissions. The advantages and disadvantages of micrometeorological and chamber methods in measuring CH4 fluxes from northern peatlands are also discussed. The magnitude of CH4 flux varies considerably among peatland types (bogs and fens) and microtopographic locations (hummocks and hollows). Some anthropogenic activities including forestry, peat harvesting and industrial emission of sulphur dioxide can cause a reduction in CH4 release from northern peatlands. Further research should be conducted to investigate the in fluence of plant growth forms on CH4 flux from northern peatlands, determine the water table threshold at which plant production in peatlands enhances CH4 release, and quantify peatland CH4 exchange at plant community level with a higher temporal resolution using automatic chambers.