Journal of

To evaluate the quantitative and qualitative characteristics of forest park of Shourab's trees, consisting of Pinus brutia, Pinus pinea, Cupressus arizonica, Cupressus sempervirens var. sempervirens, Cupressus sempervirens var. Horizontals, Ailantus altissima, Robinia pseudoacasia and Fraxinus rotundifolia, inventory as a systematic random sampling and in statistical grid 100×150 meter and in 30 circular sample plots (2R) was undertaken. In each sample plot, tree's quantitative and qualitative characteristics, such as diameter at breast height,basal area of tree, tree height, crown coverage percent, h/d factor, regeneration, vitality, crown form and branchiness on the trunk were examined and measured. According to the results, about 75 percent of the species was due to conifers, especially Pinus brutia (45 percent), and 25 percent of hardwood species formed forest park trees. Also the average number of species in whole park was 604.05 per ha. The results shown that the average diameter at breast height, tree height and basal area of tree softwood species-particularly Pinus brutia and Cupressus arizonica, amounted to 23.02 cm, 9.5 m, 0.048 m² and 13.47 cm, 8.02 m and 0.042 m² higher than other species. With the concern of vitality, in softwoods, Cupressus arizonica specie had the most vitality range (85/75) percent and in hardwoods , Robinia pseudoacasia and species had the lowest vitality range (37.27) percent. Finally, we could say Softwood species afforested in terms of qualitative and quantitative indicators of hardwood species, is preferred. Nevertheless, the species of: Pinus brutia and Cupressus arizonica which have exhibited comparatively better performance are suggested for future afforestation expansion in this park.

<

Natural regeneration is the most important principle to maintain and sustain of vegetation in each region, therefore, doing the research about the relationship between natural regeneration and environmental factors can be useful for conducting a better management in these regions.Therefore, this study aimed to investigate the effects of physiographic factors and soil parameters on natural regeneration of trees and shrubs species in the forest of Baye Mountain in Eyvan city, Ilam province. Using systematic random sampling, 27 plots were implemented in the area with a total area of 900 square meters. Then environmental factors (physiographic and soil) and the number of natural regeneration were studied and measured. Correlation analysis showed that Cerasus microcarpa regeneration had positive correlation with OM and Ca and negative with EC. Regeneration of Acer monspessulanum L. had negative correlation with clay, and Amygdalus lycioides regeneration had positive correlation with silt, while there was no significant correlation between other species and other soil factors. The results showed that elevation had significant effects on natural regeneration of Cratagus pontica and Amygdalus lycioides, while the slope of gradient hadn&#39;t any significant effect on regeneration. Only, aspect had significant effects on Cerasus microcarpa regeneration, and regeneration of this species in the eastern and northwestern direction was more than other aspects.