M.Sc. Tezi Görüntüleme | |||||||||||||||||||||
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| Summary: This study investigates the water stress related to physiological features and the total water potential contents of Scotch pine saplings which is one of the main forest species of Turkey. We measured the seasonal plant water stress values predawn and in midday, then analyzed and compared the extreme plant water stress values. Using pressure-volume (P-V) curve method, we calculated the total water potential contents and depicted the seasonal trends. Also, we examined periodical total carbohydrate and total chlorophyll contents to find out if any differences among those values. We determined some morphological features including seedling length, root collar diameter and branch number in relation with physiological features. Measurements revealed the period between mid-September and mid-November as most appropriate uprooting period for Scotch pine saplings. In this period, water potential in wilting point values are minimal which refers to the maximal resistance of saplings against the wilting. At the latest, irrigation program should be started in mid-May when plant water tension values are above 8 bars. This program should be continued as long as the water tension value before dawn is above 8 bars.Total carbohydrate quantity is high particularly when vegetation period is dry and air temperatures and accordingly plant water tension are high. The increase in total carbohydrate quantity is a precaution of plants against the stress. Variance analyzes on total carbohydrate and total chlorophyll values revealed the seasonal differences. Key Words: Scots pine, Pressure-volume (p-v) curve, Water stress, Drought, Physiology | |||||||||||||||||||||