Effect of the Climatic Parameters on the Trend of Vegetative Land Cover Changes with Land Degradation Approach in the Persian Gulf and Oman Sea Watershed

Document Type : Research

Authors

1 Ph.D. Candidate of Desert Management, Department of Natural Resources Engineering, Faculty of Agriculture & Natural Resources, University of Hormozgan

2 Associate Professor, Department of Natural Resources Engineering, Faculty of Agriculture & Natural Resources, University of Hormozgan

3 Assistant Professor, Department of Natural Resources Engineering, Faculty of Agriculture & Natural Resources, University of Hormozgan

4 Professor, Department of Geography, University of Valencia, Spain

Abstract

Land degradation is a multifaceted phenomenon, which is caused by various variables, including climate, land use changes and socio-human activities. In order to investigate the effects of climatic parameters on land degradation in five second degree watersheds (South Baluchistan, Bandar Abbas - Sedij, Kal - Mehran, Hillah and Mond) located in the entire Persian Gulf and Oman Sea Watershed, observational data E32 of synoptic stations were used in the mentioned catchment areas for of 31- year period (1988-2019). The IDW algorithm was used to map the climatic parameters. The results of the change detection showed that the trend of temperature class changes of 25– 27.5 follows an increasing rate of 19.03%, and the precipitation class is less than 150 mm in the region. The region is also facing an increasing trend of 17.3%. The trend of the evaporation parameter is such that the 2500-2750 and 300-3250 mm classes with the changes of -5.4, 8.3 percent, respectively, have the most decreasing and increasing effects. Moreover, the wind speed classes of less than 2 and 3-4 meters per second with changes of 5.7 and -7.5 percent show the highest increase and decrease respectively, based on the findings of the regression model, there is a significant relationship at the 0.05% level between the climatic variables (precipitation, temperature, evaporation and wind speed) on one hands and the vegetation index and salinity and the precipitation parameter on the others show the greatest effect. Considering that the four mentioned climatic variables explain 47.6% and 40.5% of the changes in the dependent variable of vegetation index and salinity, respectively, it can be concluded that part of the changes in vegetation and salinity are due to the conditions. As the climate prevails in the region, the poor vegetation and salinity were constantly fluctuating during the study period; consequently, the process of degradation followed an increasing and decreasing rate. Therefore, being aware of the effects of climatic parameters on the fluctuation of vegetation and salinity indices in a long period of 31 years, it is possible to make the necessary predictions for the optimal management of natural resources, especially during droughts. This enables the concerned authorities to control the development stages of land degradation in the coastal catchment areas of ​​the Persian Gulf and the Sea of ​​Oman.

Keywords

References

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Watershed Management Research
Volume 34, Issue 3 - Serial Number 132
September 2021
Pages 74-94

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History

  • Receive Date: 07 November 2020
  • Revise Date: 25 December 2020
  • Accept Date: 15 March 2021

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