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作 者 ：丁维新,蔡祖聪

期 刊 ：生态学报 2002年 22卷 10期 页码：1672~1679

关键词：甲烷；甲烷产生；有机质；根系分泌物；外源有机物；

Keywords:methane, methane production, soil organic matter, exudates, exogenous organic material,

摘 要 ：对土壤有机质含量及组分、外源有机物和根系分泌物对甲烷产生的影响作了综述。土壤产甲烷量和甲烷排放量随有机质含量增加而提高 ,与土壤中易矿化有机碳或沸水浸提有机碳含量呈显著相关。外源有机碳加入促进了土壤排放甲烷 ,刺激效果与外源有机碳的用量和组成有关。还原力强的有机物如纤维素和半纤维素较还原力弱的有机物如类脂和多糖能够产生更多的甲烷。甲醇、甲基化氨基酸等无其它微生物竞争利用的有机物能被产甲烷菌更多地转化成甲烷。植物根系分泌物也促进甲烷的产生 ,促进作用大小与植物种类及分泌物的数量和质量有关。外源有机物通过 3种方式促进土壤甲烷产生 :提高土壤的甲烷底物供应量 ,降低土壤氧化还原电位 ,刺激土壤原有有机碳的转化。

Abstract:The CH 4 concentration in the atmosphere is increasing continuously, with possibly profound consequences for future global climate. Wetlands, including rice paddy fields and mires, contribute between 15 and 45% of global CH 4 emissions. CH 4 emissions from wetlands show a large variation, which can‘t so far clearly be predicted by environmental and soil variables. This limits the accuracy of estimates of both current and future global CH 4 emission. CH 4 production is a microbiological process, which t...

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