Straw Mulching and Nitrogen Fertilization Affect Diazotroph Communities in Wheat Rhizosphere
| Autor: | Xiaoling Xiang, Gaoqiong Fan, Han Li, Ma Hongliang, Jiarong Zhao, Songhe Chen, Petri Penttinen, Ting Zheng, Rencai Gao |
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| Rok vydání: | 2021 |
| Předmět: |
Microbiology (medical)
Microbiology nifH gene 03 medical and health sciences Human fertilization Microbial inoculant 030304 developmental biology Original Research 0303 health sciences Rhizosphere abundance Azotobacter biology Chemistry food and beverages diazotroph community 04 agricultural and veterinary sciences Soil carbon nitrogen fertilization Straw biology.organism_classification QR1-502 Agronomy straw mulching Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Diazotroph |
| Zdroj: | Frontiers in Microbiology Frontiers in Microbiology, Vol 12 (2021) |
| ISSN: | 1664-302X |
| Popis: | Diazotrophs that carry out the biological fixation of atmospheric dinitrogen (N2) replenish biologically available nitrogen (N) in soil and are influenced by the input of inorganic and organic substrates. To date, little is known about the effects of combined organic substrate addition and N fertilization on the diazotroph community composition and structure in purple soils. We investigated the effects of N fertilization and straw mulching on diazotroph communities by quantifying and sequencing thenifHgene in wheat rhizosphere. The abundance and richness of diazotrophs were greater the higher the fertilization level in the mulched treatments, whereas in the nonmulched treatments (NSMs), richness was lowest with the highest N fertilization level. The abundance and α-diversity of diazotrophs correlated with most of the soil properties but not with pH. At the genus level, the relative abundances ofAzospirillum,Bacillus, andGeobacterwere higher in the NSMs and those ofPseudacidovorax,Skermanella,Azospira,Paraburkholderia,Azotobacter,Desulfovibrio,Klebsiella, andPelomonasin the mulched treatments. The differences in community composition between the mulched and the NSMs were associated with differences in soil temperature and soil organic carbon and available potassium contents and C:N ratio. Overall, straw mulching and N fertilization were associated with changes in diazotroph community composition and higher abundance ofnifHgene in alkaline purple soils. |
| Databáze: | OpenAIRE |
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