Document Type : Original Article

Authors

• Mohammad Asgari ¹
• Vahid Etemad ²
• Khaled Ahmadauli ³
• Ehsan Abdi ²
• Salman Zare ³
• Mohsen Javanmiri pour ⁴

¹ Late PhD Student, Faculty of Natural Resources, University of Tehran, Karaj, Iran.

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

³ Assistant Professor, Department of Revitalization and Dry and Desert Areas, Faculty of Natural Resources, University of Tehran, Karaj, Iran.

⁴ PhD Graduated, Department of Revitalization and Dry and Desert Areas, Faculty of Natural Resources, University of Tehran, Karaj, Iran.

Abstract

This study investigates the effect of drought stress on water requirement and morphological characteristics of Eldarica pine and Chinaberry species at different vegetative ages in Robat-Karim region of Tehran province. This study was conducted as a factorial design with three factors: species type, age, and drought stress with a completely random basic design in 10 replications. The factors included the plant component i.e. Tehran pine and bitter olive species and age in three levels (one, three and five years) and drought stress in three levels: mild, medium and high (0.3, 0.5 and 0.7). A total of 18 treatments (9 treatments for each species) and considering the number of 10 repetitions, a total of 180 microlysimeters were obtained. This research was defined according to its objectives, i.e. determining the water requirement, determining the plant factor and examining the effect of drought stress on the water requirement and plant factor. In the phases of determining irrigation planning, there was moisture monitoring in drought stress levels and the measurement of water requirements of species, the phase of calculating reference evaporation and transpiration and vegetation coefficient, and the phase of evaluating the effects of different drought stresses on water requirement and vegetation coefficient. The amount of water consumption in Eldarica pine seedlings during the plant growth period and in different treatments applied including drought stress treatments of 0.3, 0.5, 0.7 at age 1, drought 0.3, 0.5 and 0.7 at age 3, drought 0.3, drought 0.5 and 0.7 at age 5, including 239.3, 258.3, 307.13,

Keywords

• : Potential transpiration evapotranspiration
• reference transpiration evapotranspiration
• plant coefficient
• microlysimeter

Main Subjects

• Drought