Inoculation of Cyanobacteria in order to Improve Biocrustation and Stabilizing Dried-up Beds of Urmia Lake

Document Type : Original Article

Authors

1 1 Dept of Soil Science, Faculty of Agriculture, Urmia University

2 Dept of Soil Sci. Urmia Uni

3 1 Dept of Range and Watershed Management, Faculty of Natural Resources, Urmia University

4 Dept of Soil Science, Faculty of Agriculture, Urmia University

Abstract

Nowadays, the inoculation of cyanobacteria has been noticed as a new and environmentally friendly strategy in stabilizing erosion-prone beds. The current study was carried out with the aim of evaluating cyanobacteria inoculation in the biocrustation and stabilization of the dried-up beds of Lake Urmia in laboratory conditions. For this purpose, samples were prepared from the dried-up bed of Urmia Lake in Jabalkandi region of Urmia and were prepared after being transferred into erosion trays. The efficient cyanobacteria in soil stabilization were isolated and identified. Then, cyanobacteria were inoculated to the surface of the trays at four concentrations of 0, 1, 3, and 6 g m-2. After 120 days, the wind simulation was done at a speed of 72 km/h in six 5-minute intervals for 30 minutes on the trays. The results showed that the amount of soil loss in control treatments, 1, 3 and 6 g m-2 cyanobacteria inoculation was 12.35, 8.87, 4.11 and 0.73 kg m-2 min-1, respectively. Inoculation of cyanobacteria in treatments with concentrations of 1, 3 and 6 g m-2, respectively led to a declining of 28.15, 66.65, and 99.40 % of soil loss compared to the control treatment. The erodibility threshold of the control treatments and inoculation of 1 and 3 g m-2 of cyanobacteria biomass was at the beginning (minutes 0-5), minutes 10-15 and minutes 15-20, respectively. No noticeable erosion was observed in the inoculation of 6 g m-2 by the end of the experiment (minutes 30). The results showed that the inoculation of cyanobacteria with a biomass concentration of 6 g m-2 had the best performance in biocrustation and reducing soil loss.

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References

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History

  • Receive Date: 19 April 2023
  • Revise Date: 22 May 2023
  • Accept Date: 11 June 2023

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