摘要
Methanogens are essential in the formation of biogenic methane and have wide distribution in lakes, swamps, paddy fields and ruminant rumen in the earth surface ecosystem. As a very important greenhouse gas, methane of different sources can induce global warming （Table 1）.
Methanogens are essential in the formation of biogenic methane and have wide distribution in lakes, swamps, paddy fields and ruminant rumen in the earth surface ecosystem. As a very important greenhouse gas, methane of different sources can induce global warming （Table 1）.
