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A basal area increment model for individual trees in mixed continuous cover forests in iranian caspian forests

Journal of Forestry Research 2020年第1期31卷 99-106页

作者： Nishtman Hatami Peter Lohmander Mohammad Hadi Moayeri Soleiman Mohammadi Limaei Department of Forestry Faculty of Natural ResourcesGorgan University of Agricultural Sciences and Natural ResourcesP.O.Box 386mGorganIran Optimal Solutions in Cooperation with Linnaeus University Va¨xjo¨Sweden Department of Forestry Faculty of Natural ResourcesUniversity of GuilanP.O.Box 1144Sowmeh SaraIran

The aim of this study was to develop and test a new basal area growth model in mixed species continuous cover forests in northern *** 421 core samples from 6 main species in the forest area to develop our growth *** each plot,we measured variables such as total tree height(m),diameter at breast height(DBH)(cm)and basal area of larger trees as cumulative basal areas of trees(GCUM)ofDBH[5 *** empirical data were analyzed using regression *** was a statistically significant nonlinear function between the annual basal area increment,as the dependent variable,and the basal area of the individual trees and competition as explanatory *** area from the largest trees,was circular plot with area of 0.1 *** was estimated for trees of DBH>5 ***,we investigated the dependencies of diameter growth of different species on stand density at different levels of competition,and diameter development of individual trees through *** results indicate that competition caused by larger neighborhood trees has a negative effect on *** addition,the maximum diameter increment is affected by competition ***,the maximum diameter increment of species occurs when the trees are about 35–40 cm in dense-forest(40 to 0 m^2 per ha)and when the trees are about 60 to 70 cm in very dense forest(60 to 0 m^2 per ha)which is more likely to caspian natural forests with high level density due to uneven-aged composition of stands.

关键词： Individual-tree model iranian caspian forests Continuous cover forestry Mixed stands Uneven-aged management

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Goal programming approach for sustainable forest management(case study in iranian caspian forests)

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Journal of Forestry Research 2014年第2期25卷 429-435页

作者： Soleiman Mohammadi Limaei Maryam Seddigh Kouhi Teymour Rostami Sharaji Department of Forestry Faculty of Natural ResourcesUniversity of Guilan

We used a goal programming technique to determine the optimal harvest volume for the iranian caspian forest. We collected data including volume, growth, wood price at forest roadside, and variable harvesting costs. The allometric method was used to quantify seques- trated carbon. Regression analysis was used to derive growth models. Expected mean price was estimated using wood price and variable harvesting costs. Questionnaire was used to determine the constraints and the equation coefficients of the goal programming model. The optimal volume was determined using the goal programming method according to multipurpose forest management. LINGO software was used for analysis. Results indicated that the optimum volumes of species were 250.25 ***-1 for beech, 59 ***-1 for hornbeam, 73 ***-1 for oak, 41 ***-1 for alder, and 32 ***-1 for other species. The total optimum volume is 455.25 ***-1.

关键词： goal programming sustainable forest management carbon sequestration iranian caspian forests

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