The effect of drought stress on the water requirement and plant factor of Tehran pine seedlings (Pinus eldarica Medw.) at various ages

Document Type : Research Paper

Authors

1 Late PhD student of Forest biological sciences, Faculty of Natural Resources, University of Tehran, Karaj, Iran

2 Associate Professor, Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, Iran

3 PhD in Forest Sciences, Faculty of Natural Resources, University of Tehran, Karaj, Iran

4 Assistant Professor, Department of Arid and Mountainous Regions Reclamation, Faculty of natural resources, University of Tehran, Karaj, Iran

10.29252/aridbiom.2024.20945.1977

Abstract

One of the basic limitations in dry areas is the allocation of water resources for the development of green spaces, including public and non-public green spaces, forest and non-forest parks and gardens, forestry and green belts. The objective of this research project is to investigate the impact of drought stress on the water requirements of Tehran pine species at different stages of growth. The research employed a factorial design, with factors including age and drought stress, using a completely random basic design in 10 replications. The considered factors were Tehran pine as the plant species, three age levels (one, three, and five-year-old species), and three drought stress levels (mild 0.3, moderate 0.5, and high 0.7). This resulted in a total of 9 treatments, and with 10 repetitions, a total of 90 microlysimeters were utilized. Results indicated that the peak of reference transpiration evaporation occurred from May to October, with July typically reaching the highest levels. The Evaporation-Transpiration diagram for Tehran pine species at ages 1, 3, and 5 years, under drought stresses of 0.3, 0.5, and 0.7 in the months of May to October, showed the highest values, while it was lowest in November. In the cumulative amount of moisture used for ages 1, 3, and 5 in the studied drought stresses for the years 2021 and 2022, it was observed that water consumption under drought stress of 0.7 was higher compared to stresses of 0.5 and 0.3. The plant coefficient of 1, 3, and 5-year-old Tehran pine seedlings in 2021 and 2022 displayed the highest values under drought stresses of 0.3, 0.5, and 0.7 from June to October, while it was lowest in April and November. Comparing the average values of evapotranspiration potential in Tehran pine seedlings under different stresses showed significant differences (p=0.01) among groups during the years 2021 and 2022. The results highlighted that Tehran pine exhibits the highest water requirement in June and July, with 89 and 59.3 mm for the years 2021 and 2022, respectively. 

Keywords

Main Subjects

References

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Journal of Arid Biome
Volume 13, Issue 2
October 2023
Pages 177-192

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