数字农科院2.0

Contributions Of Ammonia-Oxidising Bacteria And Archaea To Nitrification Under Long-Term Application Of Green Manure In Alkaline Paddy Soil

文献类型： 外文期刊

作者： Gao, SJ; Zhou, GP; Liao, YL; Lu, YH; Nie, J; Cao, WD

作者机构：

关键词： Milk Vetch; Nitrification Potential; Paddy Soil; Chemical Fertiliser; Ammonia-Oxidising Bacteria; Ammonia-Oxidising Archaea

期刊名称： GEODERMA

ISSN： 0016-7061

年卷期： 2020 年 374 卷

页码：

收录情况： JCR（2021版） ; EI（2021版）

摘要： Rice-rice-green manure rotation is a cropping system that effectively maintains high yields and improves soil fertility. Nitrification, a critical process in N cycling, is affected by different fertilisation regimes, but the roles of ammonia-oxidising bacteria (AOB) and ammonia-oxidising archaea (AOA) in nitrification and their shift in abundance and diversity in response to long-term green manure application in alkaline paddy soil is poorly understood. In the present work, nitrification potential (NP), the contributions of AOA and AOB to nitrification, abundances, and communities of AOA and AOB were studied to mechanistically understand the effects of green manuring and fertilisation regimes on nitrification and ammonia oxidisers. Results showed that the combination of green manure and reduced chemical fertiliser increased grain yields. Soil NP increased with increasing amount of chemical fertiliser. The combination of green manure and different rates of chemical fertiliser promoted the soil recovered nitrification potential (RNP) and the contribution of AOB to nitrification (RNPAOB). Differences in AOA and AOB communities revealed that an increase in the abundance of Nitrosopumilus in AOA and a decrease in the abundance of Nirosomonas in AOB were observed in green manure treatment compared with those of chemical fertiliser treatments. Partial least squares path modelling showed that chemical fertilisation exerts direct effects on NP whereas green manuring markedly influenced RNP. For the relative contributions of AOA (RNPAOA) and AOB, RNPAOB were correlated with chemical fertilisation, whereas green manuring directly affected RNPAOA. In conclusion, green manuring changed the nitrification process by affecting RNP, whereas chemical fertiliser directly influenced NP. Changes in AOA composition and their impact on nitrification might reflect a mechanism worthy of further research.

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