Studying the five-year results of the growth and survival of six tree species in the green space of Robat Karim in climatic uncertainty

Document Type : Research Paper

Authors

1 Ph.D. Student of Forest Biological Sciences, Faculty of Natural Resources, University of Tehran, Karaj, Iran

2 Ph.D. Graduated, Faculty of Natural Resources, University of Tehran, Karaj, Iran

3 Ph.D. Student of Forest Management, Faculty of Natural Resources, University of Tarbiyat Modarres, Noor, Iran

10.29252/aridbiom.2023.19639.1922

Abstract

The main challenge to compromising with climate change from a management approach is dealing with the uncertainty of future climate changes. Analyzing the effect of climate change on tree species used for afforestation in Robat Karim as a city in the central arid regions of Iran was the purpose of this study. Afforestation with two-year seedlings of Mulberry (Morus alba), Tehran pine (Pinus eldarica), Tree of heaven (Ailanthus altissima), Ash (Fraxinus rotundifolia), Blackberry (Acer negundo), and, Acacia (Robinia pseudoacacia) took place after preparing the planting substrate in 2016. The diameter of the trunk, the height of the seedlings, the freshness of the leaves (good, medium, and pale), and the health of the seedlings (healthy, semi-healthy, infested) were measured during the planting. These parameters were measured again in 2022 after five years. Furthermore, to analyze the trend of seven climatic factors such as mean temperature (°C), mean maximum temperature (°C), the mean minimum temperature (°C), mean wind speed (m/s), the mean number of daily sunny hours from 1951 to 2021 and average reference evapotranspiration (mm) from 1991-2021, was carried out. The analysis results of climate elements showed that climate changes are taking place in the form of an increase in the mean annual temperature, an increase in the maximum and minimum temperature, a reduction in the total annual rainfall, a decrease in the wind speed, and an increase in the reference evaporation and transpiration. The number of Boxelder maple reached 80 trees, while the number of Tehran pine and Acacia seedlings did not change much and were equal to 145 individuals in 2022. The highest annual diameter growth rate includes Acacia and Tehran pine with 1.1 and 1.05 cm, respectively, while the lowest annual diameter growth rate involves black maple with 0.78 cm. The ANOVA test results to compare the condition of the trees in terms of the decay degree of the studied species in 2022 indicate a significant difference (p=0.05) between the studied groups. The priority is to determine native species and species such as Tehran pine and Acacia that can adapt to occurring tensions.

Keywords

References

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Journal of Arid Biome
Volume 12, Issue 1
April 2022
Pages 107-119

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