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| Effects of different acid modulators on the microbial communities in maize planting red soil |
| Received:May 16, 2023 |
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| KeyWord:red soil;acid regulation;metagenome;microbial community;carbon/nitrogen metabolism |
| Author Name | Affiliation | E-mail | | YANG Ling | College of Resources, Hunan Agricultural University, Changsha 410128, China | | | ZHANG Yi | College of Resources, Hunan Agricultural University, Changsha 410128, China | | | ZHONG Junjie | College of Resources, Hunan Agricultural University, Changsha 410128, China | | | NIE San'an | College of Resources, Hunan Agricultural University, Changsha 410128, China | sanie@hunau.edu.cn | | SUN Geng | Hunan Soil and Fertilizer Institute, Changsha 410125, China | | | SHENG Hao | College of Resources, Hunan Agricultural University, Changsha 410128, China | |
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| Abstract: |
| The aims of this study were to investigate the response of red soil microbial abundance and community composition to different acid regulators as well as the changes in microorganisms that affect key carbon/nitrogen metabolic processes. Four potted treatments were set up:no fertilization(CK), calcium/magnesium compound(L), L mixed with pig manure(ML), and L mixed with straw(SL). Metagenomic sequencing technology was used to analyze the soil microbes and key carbon/nitrogen metabolism process microorganisms. The results showed that the L, ML, and SL treatments significantly increased the soil pH and exchangeable calcium and magnesium, but significantly reduced the soil exchangeable acids. The acid regulators increased the bacterial relative abundance of Proteobacteria but decreased Chloroflexi and Acidobacteria while reducing the fungal relative abundance of Mucoromycota. The archaeal relative abundance of Euryarchaeota and Candidatus_Bathyarchaeota was increased, while Thaumarchaeota was decreased. The RDA analysis showed that available potassium is the main factor that affects the structure of soil bacterial and fungal communities, while soil pH and organic carbon are key factors that affect the composition of soil fungal and archaeal communities. In terms of the carbon metabolism process, Proteobacteria had the highest contribution in the SL treatment, while in the ML the highest contribution was attributed to Actinobacteria and Gemmatimonadetes. In the process of nitrogen metabolism, Chloroflexi contributed more than 80% toward nitrification. Acid regulation reduced the contribution of Chloroflexi and Acidobacteria in the process of denitrification and nitrate dissimilation reduction. The contribution of Proteobacteria to SL was lower than that to ML, while the contribution of Actinobacteria to ML was higher than that to L and SL. The application of L, ML, and SL may alleviate the acidity of red soil, change the dominant microbial community, and facilitate carbon/nitrogen accumulation. |
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