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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Ammonia-oxidizing bacteria respond to multifactorial global change
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Ammonia-oxidizing bacteria respond to multifactorial global change

机译：氨氧化细菌应对多因素全球变化

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Recent studies have demonstrated that multiple co-occurring global changes can alter the abundance, diversity, and productivity of plant communities. Below ground processes, often mediated by soil microorganisms, are central to the response of these communities to global change. Very little is known, however, about the effects of multiple global changes on microbial communities. We examined the response of ammonia-oxidizing bacteria (AOB), microorganisms that mediate the transformation of ammonium into nitrite, to simultaneous increases in atmospheric CO2, precipitation, temperature, and nitrogen deposition, manipulated on the ecosystem level in a California grassland. Both the community structure and abundance of AOB responded to these simulated global changes. Increased nitrogen deposition significantly altered the structure of the ammonia-oxidizing community, consistently shifting the community toward dominance by bacteria most closely related to Nitrosospira sp. 2. This shift was most pronounced when temperature and precipitation were not increased. Total abundance of AOB significantly decreased in response to increased atmospheric CO2. This decrease was most pronounced when precipitation was also increased. Shifts in community composition were associated with increases in nitrification, but changes in abundance were not. These results demonstrate that microbial communities can be consistently altered by global changes and that these changes can have implications for ecosystem function.
机译：最近的研究表明，多种共同发生的全球变化可以改变植物群落的丰度，多样性和生产力。通常由土壤微生物介导的地下过程对于这些群落对全球变化的响应至关重要。然而，关于多种全球变化对微生物群落的影响知之甚少。我们研究了氨氧化细菌（AOB）（介导铵转化为亚硝酸盐的微生物）对大气二氧化碳，降水，温度和氮沉降的同时增加的反应，在加利福尼亚草原的生态系统水平上对此有一定的控制作用。社区结构和丰富的AOB都对这些模拟的全球变化做出了响应。氮沉积的增加显着改变了氨氧化群落的结构，不断使群落朝着与亚硝基螺菌属最紧密相关的细菌的主导地位转移。 2.当温度和降水量不增加时，这种变化最为明显。随着大气CO2的增加，AOB的总丰度显着降低。当降水量也增加时，这种减少最为明显。群落组成的变化与硝化作用的增加有关，但丰度的变化却没有。这些结果表明，微生物群落可以被全球变化持续改变，这些变化可能对生态系统功能产生影响。

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