Methane Dynamics in Northern Peatlands： A Review

• Published in: Pedosphere 2009-08, Vol.19 (4), p.409-421
• Main Author: LAI, D.Y.F.
• Format: Article
• Language: English
• Subjects: Freshwater; global carbon cycle; greenhouse gas; methane oxidation; methanogenesis; methanotrophy; 二氧化硫排放量; 全球碳循环; 动力学; 地下水位; 工厂生产; 泥炭地; 甲烷排放量; 甲烷通量
• ISSN: 1002-0160; 2210-5107
• DOI: 10.1016/S1002-0160(09)00003-4

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 influence 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.