Microbial functional attributes, rather than taxonomic attributes, drive top soil respiration, nitrification and denitrification processes

We lack empirical evidence for the relative importance of microbial functional attributes vs taxonomic attributes in regulating specified soil processes related to carbon (C) and nitrogen (N) cycling, which has hindered our ability to predict the responses of ecosystem multifunctionality to environm...

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Vydáno v:The Science of the total environment Ročník 734; s. 139479
Hlavní autoři: Chen, Qing-Lin, Ding, Jing, Li, Chao-Yu, Yan, Zhen-Zhen, He, Ji-Zheng, Hu, Hang-Wei
Médium: Journal Article
Jazyk:angličtina
Vydáno: Netherlands Elsevier B.V 10.09.2020
Témata:
algorithms
carbon
community structure
denitrification
Ecosystem functions
ecosystems
environment
fungal communities
fungi
Microbial community
nitrification
nitrogen
Nitrogen and carbon cycling
poultry manure
sewage sludge
soil pH
soil respiration
species diversity
taxonomy
topsoil
total nitrogen
Traits
Nitrogen and carbon cycling
Ecosystem functions
Traits
Microbial community
ISSN:0048-9697, 1879-1026, 1879-1026
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Shrnutí:We lack empirical evidence for the relative importance of microbial functional attributes vs taxonomic attributes in regulating specified soil processes related to carbon (C) and nitrogen (N) cycling, which has hindered our ability to predict the responses of ecosystem multifunctionality to environmental changes. Here, we collected soil samples from a long-term experimental field with eight inorganic and organic fertilization treatments and evaluated the linkage between microbial functional attributes (abundance of functional genes), taxonomic attributes (microbial taxonomic composition), and soil processes including soil respiration, denitrification and nitrification. Long-term fertilization had no significant effect on the bacterial or fungal alpha-diversity. The treatments of chicken manure and sewage sludge addition significantly altered the rates of soil respiration, denitrification and nitrification, which were significantly correlated with the abundances of relevant functional genes. Random forest model indicated that the abundance of functional genes was the main diver for the rate of soil processes. The predominant effect of microbial functional attributes in driving soil processes was maintained when simultaneously accounting for multiple abiotic (total C, total N and soil pH) and biotic drivers (bacterial and fungal community structure), indicating that microbial functional attributes were the predominant driver predicting the rate of soil respiration, denitrification and nitrification. Our results suggested the importance of developing a functional gene-centric framework to incorporate microbial communities into biogeochemical models, which may provide new insights into the biodiversity-functions relationship and have implications for future management of the consequences of biodiversity loss for ecosystem multifunctionality. [Display omitted] •The QMEC is a powerful approach to analyze a wide spectrum of functional genes.•Organic fertilization increased the rate of soil respiration, nitrification and denitrification.•Microbial functional attributes are more sensitive predictors of soil C and N cycling.
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ISSN:0048-9697
1879-1026
1879-1026
DOI:10.1016/j.scitotenv.2020.139479