Effects of Different Fertilizer Treatments on Rhizosphere Soil Microbiome Composition and Functions

Yanan Li, Chengyu Wang, Tianye Wang, Yutao Liu, Shuxia Jia, Yunhang Gao and Shuxia Liu
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Yanan Li: College of Resources and Environment, Jilin Agricultural University, Changchun 130000, China
Chengyu Wang: College of Resources and Environment, Jilin Agricultural University, Changchun 130000, China
Tianye Wang: College of Resources and Environment, Jilin Agricultural University, Changchun 130000, China
Yutao Liu: Qiqihar Branch Institute of Heilongjiang Academy of Agricultural Sciences, Qiqihar 161000, China
Shuxia Jia: Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
Yunhang Gao: College of Animal Science and Technology, Jilin Agricultural University, Changchun 130000, China
Shuxia Liu: College of Resources and Environment, Jilin Agricultural University, Changchun 130000, China

Land, 2020, vol. 9, issue 9, 1-19

Abstract: Fertilization influences the soil microbiome. However, little is known about the effects of long-term fertilization on soil microbial metabolic pathways. In this study, we investigated the soil microbiome composition and function and microbial participation in the N cycle according to the Kyoto Encyclopedia of Genes and Genomes (KEGG) and gene ontology (GO) functional annotation of different genes in a metagenomic analysis after long-term fertilization. Fertilizer application significantly changed the soil C/N ratio. Chemical fertilizer (NPK) treatment decreased soil pH, and chemical fertilizer combined with straw (NPK+S0.5) treatment increased ammonium nitrogen (NH 4 + -N) but decreased nitrate nitrogen (NO 3 − -N). NPK, NPK+S0.5 and S0.5 applications did not change the soil microbiome composition or dominant phylum but changed the relative abundances of microbiome components. Moreover, fertilizer significantly influenced metabolic processes, cellular processes and single-organism processes. Compared with a no-fertilizer treatment (CK), the NPK treatment resulted in more differentially expressed gene (DEG) pathways than the NPK+S0.5 and S0.5 treatments, and these pathways significantly correlated with soil nitrate nitrogen (NO 3 − -N), available phosphorus (AP) and the moisture content of soil (MC). KEGG analysis found that fertilizer application mainly affected the ribosome, photosynthesis and oxidative phosphorylation pathways. S0.5 and NPK+S0.5 increased microbial nitrogen fixation, and NPK and NPK+S0.5 decreased amoA and amoB and accelerated denitrification. Thus, organic fertilizer increased N fixation and nitrification, and inorganic N fertilizer accelerated denitrification. We found that the function of the soil microbiome under different fertilizer applications could be important for the rational application of fertilizer and for environmental and sustainable development.

Keywords: metagenomic analysis; rhizosphere; soil microbiome; microbiome function; fertilizer (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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