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Babk Pilehvar, Sayed Vahid Sayedena, Javad Soosani, Hamzeh Jafari Sarabi,
Volume 1, Issue 2 (3-2015)
Abstract

Assessment of the plantation is fundamental for managers to improve plantation quality and successful plantation in the future. This study aimed to assess and compares Makhmalkooh forest park plantation data due to 18 years old period. Sampling was performed in a randomized systematic design using 60 circular plots in a 50*150 m rectangular grid. Diameter at breast height, basal area, tree height and crown canopy were measured for each species in all plots, and then total volume and mean of growth increment based on age were computed. Results showed that Cupressus arizonica and Amygdalus scoparia had the highest value in density, heterogeneity in species composition, and crown canopy and Capressus sempervirens and Olea europea had the least one. The survival rate for all species were 78.5 percent and different plantation types showed significant difference in diameter, basal area, crown canopy and total volume. The most value in mean of diameter and height increment was assigned to Pinus brutia and Cupressus sempervirens and the least value were assigned to Olea europea and Amygdalus scoparia. The results showed that Cupressus arizonica and Pinus brutia are the best species for afforestation in this region.
Amir Modaberi, Javad Soosani, Shyda Khosravi,
Volume 2, Issue 1 (9-2015)
Abstract

The main objective of this study was to estimate the effect of decline disturbance on diameter distribution of coppice oak trees in central Zagros region. For this purpose, two similar stands with equal areas (32ha) in central Zagros (Shorab in Lorestan province and Zarabin in Ilam province) were selected. Diameter at the breast height of declined trees was recorded before and after cutting using 100% inventory method. Following probability density functions (PDFs) Beta, Jonson, Weibull, Gamma, Normal and Log-normal were fitted to the data. The results of goodness of fit tests shown that Beta, Weibull and Jonson PDFs were fitted well to diameter of woody stems in Shorab but Jonson, Beta PDFs were much m ore suitable for Zarabin region. The difference of diameter at hight breast was studied in two stages of before and after declining by means of mortality PDF and using different PDFs. There was a big difference in diameter classes between before and after decline disturbance according to mortality distribution. There was no difference between before and after decline disturbance based upon statistical distribution fitting criteria. Outbreak of decline within this region had merely similar influences on all diameter classes, and as a result, it had not a significant effect on overall diameter fit.



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