بررسي تاثير برخي عوامل بوم شناختي در توليد بذر گونه راش در جنگل خيرودكنار (پارسل 117)

Investigation on Effects of Some Ecological Factors on Beech Nut Production in Kheyrood-kenar Forest (Compartment 117)

In order to find out the relationship between beech nut production and properties of Edafic, physiographic, and leaf element nutrient factors in the pure beech stand, 30 beech trees were selected from 40 to 130 cm. This study was conducted at the Kheyroud-kenar research forest where beech nuts were collected from all four geographical directions around each tree. sampling was performed on the basis of cluster sampling method where plots of lm wide were used, the length of each plot being the same as the radius of tree crown. Total beech nut of each tree was determined and divided into five categories: l) empty, 2) undamaged seed, 3) consumed by mouse (Glis Glis), 4) consumed by other animals, and 5) consumed by insects. The results of the classification showed that only one percent of seeds were undamaged, but 99% percent were damaged seriously by biotic and abiotic factors. Data analysis indicated that there were significant relationships between total production with tree diameter and height, as well as canopy height and diameter. The data matrix from soil nutrient elements and leaves nutrient agents were used to execute a PCA (principal component analysis) in order to reduce the number of independent environmental variables in data set by finding their combination lines. Trees with the highest fruitification had a significant correlation with depth of soil, nutrient elements in soil and leaves (especially B element in both), and soil moisture. The trees with lowest fructification were correlated with steep slopes, dry sites, nutrient element deficiency, and shallow soil.