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Bacterial Community Characterization and Microbial Respiration of Selected Arable Soils of Ethiopia

  • SOIL BIOLOGY
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Abstract

Soil microbial communities are considered a prominent soil fertility component since they highly influence soil processes. Despite the current challenges of soil fertility in Ethiopia, the biological properties of soils have been rarely incorporated into soil management decisions and research. The present study describes the bacterial community structure, pattern of soil microbial respiration (SMR), and their relationship with soil physicochemical properties in selected arable soils from four sites, with Luvisols, Cambisols, Vertisols, and Nitisols in the Tigray Regional State of Ethiopia. We employed amplicon sequencing and basal respiration methods to investigate the bacterial community structure and microbial respiration rate, respectively. SMR was higher in the Nitisol samples with a high amount of P2O5, soil organic carbon (SOC), and exchangeable Mg2+. Amplicon sequencing results (400 bp/OTU reads) revealed that the bacterial community was dominated by Actinobacteria, Chloroflexi, and Proteobacteria phyla. The highest ratio of Actinobacteria was found in Vertisol, while that of Chloroflexi and Proteobacteria was detected in Luvisol and Nitisol, respectively. Among the Alphaproteobacteria, order Rhizobiales (including Rhizobiaceae, Beijerinckiaceae, Xanthobacteraceae, Devosiaceae family) was the most abundant nitrogen-fixing bacteria in the soil samples. From the known P-mobilizing and Indole Acetic Acid (IAA) bacteria, members of Bacillus and Pseudomonas were found in low abundance (<1%). Overall, this study highlighted that P2O5, SOC, and Mg2+ probably influenced the variations of bacterial community structure and SMR. The relatively low abundance of important plant growth promoting bacteria (PGPB) in the investigated sites suggests the need for appropriate soil management practices for better crop yield. We recognized that this study was preliminary research, and much work still needs to be done to get a comprehensive view of the agrobacterial community structure and SMR of soils in the study area.

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FUNDING

This work was funded by Stipendium Hungaricum Scholarship Program (SHE-935-1/2016 and it was supported by the Ministry of Innovation and Technology within the framework of the Thematic Excellence Program 2020, Institutional Excellence Sub-Program (TKP2020-IKA-12) in the topic of water-related researches of Hungarian University of Agriculture and Life Sciences. Mátyás Cserháti was supported by the ÚNKP-18-4/12 New National Excellence Program of the Ministry of Human Capacities. We are grateful to Mr. Mehretab Haileselassie and other Tigray Agricultural Research Institute members for their help in the fieldwork.

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Authors and Affiliations

  1. Hungarian University of Agriculture and Life Sciences, Institute of Environmental Sciences, H-2100, Gödöllő, Hungary

    T. G. Weldmichael, B. Simon, E. Michéli & F. Adiyah

  2. Addis Ababa Science and Technology University, School of Applied Sciences, P.O. Box 16417, Addis Ababa, Ethiopia

    T. G. Weldmichael

  3. Hungarian University of Agriculture and Life Sciences, Institute of Aquaculture and Environmental Safety, H-2100, Gödöllő, Hungary

    D. Márton & M. Cserháti

  4. Tigray Agricultural Research Institute, Mekelle Soil Research Center, Department of Soil Fertility Research, P.O. Box 1070, Mekelle, Ethiopia

    G. T. Reda

Authors
  1. T. G. Weldmichael
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  2. D. Márton
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  3. B. Simon
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  4. E. Michéli
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  5. G. T. Reda
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  6. F. Adiyah
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  7. M. Cserháti
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Corresponding author

Correspondence to T. G. Weldmichael.

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The authors declare that they have no conflict of interest.

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Weldmichael, T.G., Márton, D., Simon, B. et al. Bacterial Community Characterization and Microbial Respiration of Selected Arable Soils of Ethiopia. Eurasian Soil Sc. 54, 1921–1934 (2021). https://doi.org/10.1134/S1064229321120140

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  • DOI: https://doi.org/10.1134/S1064229321120140

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