Hojatollah Fathi; Jaafar Hosseinzadeh
Abstract
Ilam province is one of the natural habitats of wild pear (Pyrus syriaca Boiss) in Iran. Fruit harvesting, inappropriate grazing forest areas, deforestation and agricultural development in recent years has endangered the existence of the species. In this study, the major habitats of the species in Ilam ...
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Ilam province is one of the natural habitats of wild pear (Pyrus syriaca Boiss) in Iran. Fruit harvesting, inappropriate grazing forest areas, deforestation and agricultural development in recent years has endangered the existence of the species. In this study, the major habitats of the species in Ilam province, which located in the forest area of Zardalan in the north eastern city of Chardavol in Ilam province, is studied. After specifying the study area on the map 1:50000, using desired parameters, the maps of slope, aspect and elevation were prepared and then by combined together, work units were determined. In each unit, according to its area, at least three random circular sample plots with area of 1000 m2 randomly settled and environmental characteristics such as slope, aspect, elevation, geographical longitude and latitude were determined. Then all the qualitative and quantitative parameters of wild pear were measured and recorded in the plots. The results showed that wild pear in intermediate slopes (15 to 30 percent) have the highest height and diameter at breast height. It was observed that, in point of health crown, crown shape and trunk quality, north aspects for wild pear are the best conditions. The findings also showed that the best trunk quality is at altitude between (1500 to 1750m), but no significant correlation between altitude and other qualitative and quantitative variables of wild pear was found.
ahmad hosseini; JAFAR HOSEINZADEH
Abstract
to determine the natural establishment pattern of Pistacia atlantica and Acer cineracens regeneration, three stands of Daalaab protected forests, Ilam province, with different topographic conditions during spring and summer of 1395 was investigated. Regeneration establishment positions were included ...
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to determine the natural establishment pattern of Pistacia atlantica and Acer cineracens regeneration, three stands of Daalaab protected forests, Ilam province, with different topographic conditions during spring and summer of 1395 was investigated. Regeneration establishment positions were included "under the tree", "under the shrub", "under the bush", "next to the rock" and "bare space". In each stand one transect was established in the direction perpendicular to the slope and along it for each regeneration establishment position three replications were selected and for each a 15m2 circular permanent plot was established. In each plot number of seedlings and their heights was measured. The most amount of regeneration for P. atlantica was found in north aspect and height of 1400 meters a. s. l., and for A. cineracens in a north aspect and 1550 meters a. s. l.. The most amount of P. atlantica regeneration was found in under the canopy of Q. persica and P. atlantica trees and the lowest amount of it depending on site conditions was found in under the canopy of A. cineracens trees and next to the rocks, and not found in bare spaces. The most regeneration establishment amount of Q. persica and P. atlantica was found in north side of tree shelter and for P. atlantica at a distance of 1/3 tree crown. The most density of tall seedlings was found at a distances of 2/3 and 3/3 tree crown and the lowest was found at a distance of 1/3 tree crown.
