Abstract
Biocrusts are specialized and complex microbial products playing important roles in the soil biogeochemistry and dune stabilization of dryland ecosystem all over the world. The objectives were to (1) isolate and identify the most predominant EPS-producing cyanobacterium from a dry land of Iran (Segzi plain) and (2) study cyanobacterial inoculation affecting the formation of biocrust and improvement of soil chemico- and biological properties. The most predominant EPS-producing isolated cyanobacterium was identified as Microcoleus vaginatus ATHK43 (MW433686 NCBI accession number) and utilized as soil inoculants. Surface and sub-surface soil chemical (pH, EC, CEC, cations content) and biological properties (chlorophyll a, organic carbon, total N, EPS contents, and invertase and dehydrogenase activities) were investigated during the formation and development of biocrust. The biocrust significantly (P < 0.01) increased EC, total N, K, Ca, Mg, CEC, EPS amount, chlorophyll a, and organic carbon (C) contents of the surface soil. A high and significant correlation was found between chlorophyll content with organic C (R2 = 0.98), N (R2 = 0.98), and EPS amount (R2 = 0.96) of biocrust in the surface soil. The activities of dehydrogenase and invertase enzymes were also significantly increased (P < 0.01) after 90 days of inoculation. In conclusion, such alterations in the soil chemico- and biological properties play an important role in nutrient cycling and improvement of soil structure, fertility, and stability. So, the formation of biocrust by bacterial inoculation can be used as a cost-effective and sustainable biogeotechnological method for re-establishment and enhancement of soil properties in dry and semi-dry lands.
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The authors would like to thank very much the international publisher, AbtinBerkeh Scientific Ltd. Company (https://AbtinBerkeh.com), Isfahan, Iran, for editing the manuscript, and revising it according to the journal format.
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AK conducted the experiments and collected and analyzed data, AT supervised the research and wrote the first draft, and MH co-supervised the research.
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Karimi, A., Tahmourespour, A. & Hoodaji, M. The formation of biocrust and improvement of soil properties by the exopolysaccharide-producing cyanobacterium: a biogeotechnological study. Biomass Conv. Bioref. 13, 15489–15499 (2023). https://doi.org/10.1007/s13399-022-02336-0
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DOI: https://doi.org/10.1007/s13399-022-02336-0