Distinct drivers of activity, abundance, diversity and composition of ammonia-oxidizers: evidence from a long-term field experiment

文献类型： 外文期刊

第一作者： Guo, Junjie

作者： Guo, Junjie;Ling, Ning;Zhu, Chen;Kong, Yali;Wang, Min;Shen, Qirong;Guo, Shiwei;Chen, Huan

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关键词： Long-term fertilization;Ammonia-oxidizers;1-Octyne inhibitor

期刊名称：SOIL BIOLOGY & BIOCHEMISTRY （ 影响因子：7.609； 五年影响因子：8.312 ）

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收录情况： SCI

摘要： AbstractAmmonia oxidation, the primary and rate-limiting step of nitrification, is mediated by both ammonia-oxidizing archaea (AOA) and bacteria (AOB). However, the dominant environmental driver of the activity, abundance, diversity and composition of ammonia-oxidizers has not been well understood enough, and the relative contribution of AOA and AOB to nitrification is still under debate. Soils treated with different fertilization regimes in an over 35-year field experiment were collected to explore the variation in function and structure of ammonia-oxidizer communities and corresponding driver. The highest nitrification activity (44.49?mg?N kg?1soil d?1) was found in only organic fertilizer (O) treated soil, whereas the lowest activity (2.81?mg?N kg?1soil d?1) was observed in only mineral fertilizer (NPK) treated soil. Moreover, as 1-octyne was employed to discriminate AOA- and AOB-supported nitrification, AOA dominated (93.53%) the nitrification in the Control soil, while AOB contributed dominantly (84.73–89.10%) in all of the organic amended soils, and NPK-treated soil showed an almost equal contribution to AOA (45.79%) and AOB (54.21%). Compared with the Control soil, AOA abundance increased in soils with organic and low chemical fertilizer but decreased in only chemically treated soil, whereas the AOB abundance in all fertilized soils was greatly enhanced. The AOA activity was linearly dependent on AOA abundance, whereas the AOB activity was exponentially correlated with AOB abundance. The sequences of AOA and AOB in the Control soil were mostly affiliated with group I.1bthaumarchaeotaand genusNitrosospiraclusters 3a.1. Soil treated with NPK increased the abundance of AOA that belonged to group I.1a-associated lineage, whereas more abundant AOB was related toNitrosospiraclusters 3a.2 and 8b. In contrast, the O-treated soil showed more abundant AOB that belonged toNitrosospiraclusters 3b and 8b. As revealed by aggregated boosted tree analysis, the soil ammonium (NH4+) content was identified as the dominant driver of activity and diversity of AOA, and soil pH was considered to be the major influencing factor in abundance and composition of AOA; the AOB composition was mainly affected by soil NH4+content, the relative activity and diversity by soil pH, and the relative abundance by soil electrical conductivity (EC). Collectively, different fertilization regimes will result in variations in activity, abundance, diversity and composition of ammonia-oxidizers with distinct drivers. Our research could be helpful to identify better strategies for the mitigation of nitrate production in agricultural soils.Highlights?Soil samples were collected from a 35-year long-term experiment.?1-Octyne was used to differentiate the ammonia oxidation activities of AOA and AOB.

分类号： S1

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