Stimulation by ammonium-based fertilizers of methane oxidation in soil around rice roots
Stimulation by ammonium-based fertilizers of methane oxidation in soil around rice roots
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DOI：
10.1038/35000193
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发表时间：
2000-01-27
期刊：
影响因子：
64.8
通讯作者：
Frenzel, P
中科院分区：
文献类型：
--
作者：
Bodelier, PLE;Roslev, P;Frenzel, P
甲烷参与了地球大气中的许多化学和物理过程，包括全球变暖(1)，大气甲烷主要来自生物来源，如稻田和自然湿地；前者至少占全球每年向大气排放甲烷的30%(2)。由于将水稻产量提高60%是维持未来30年估计的人口增长的最适当方式(3)，因此有必要加强全球化肥的使用(3)：但众所周知，增加常用的氨基化肥会增加水稻农业的甲烷排放。稻田中产甲烷菌产生的甲烷约有10%-30%被与水稻根部相关的甲烷氧化细菌消耗(4，5)；这些细菌通常被认为是被以铵为基础的肥料所抑制，正如TVA在土壤(6-8)和沉积物(9，10)中所证明的那样。相反，我们在这里表明，受精后，这种细菌在水稻根部的活动和生长受到刺激。使用放射性指纹(11)和分子生物学(12)技术的组合，我们确定了造成这种影响的细菌。我们预计，我们的结果将有必要重新评估化肥使用和甲烷排放之间的联系，并对全球变暖研究产生影响。
Methane is involved in a number of chemical and physical processes in the Earths atmosphere, including global warming(1), Atmospheric methane originates mainly from biogenic sources, such as rice paddies and natural wetlands; the former account for at least 30% of the global annual emission of methane to the atmosphere(2). As an increase of rice production by 60% is the most appropriate way to sustain the estimated increase of the human population during the next three decades(3), intensified global fertilizer application will be necessary(3): but it is known that an increase of the commonly used ammonium-based fertilizers can enhance methane emission from rice agriculture. Approximately 10-30% of the methane produced by methanogens in rice paddies is consumed by methane-oxidizing bacteria associated with the roots of rice(4,5); these bacteria are generally thought to be inhibited by ammonium-based fertilizers, as tvas demonstrated for soils(6-8) and sediments(9,10). In contrast, we show here that the activity and growth of such bacteria in the root zone of rice plants are stimulated after fertilization. Using a combination of radioactive fingerprinting(11) and molecular biology(12) techniques, we identify the bacteria responsible for this effect. We expect that our results will make necessary a re-evaluation of the link between fertilizer use and methane emissions, with effects on global warming studies.