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  • 1.
    Abedi, Tooba
    et al.
    Univ Guilan, Rasht, Iran.
    Mohammadi Limaei, Soleiman
    Univ Guilan, Rasht, Iran; Univ Guilan, Sowmeh Sara, Iran.
    Bonyad, Amir Eslam
    Univ Guilan, Rasht, Iran; Univ Guilan, Sowmeh Sara, Iran.
    Torkaman, Javad
    Univ Guilan, Sowmeh Sara, Iran.
    Optimal rotation age of Populus deltoides considering economic value of timber harvesting and carbon sequestration2018In: Austrian Journal of Forest Science, ISSN 0379-5292, E-ISSN 1815-3704, Vol. 135, no 4, p. 315-342Article in journal (Refereed)
    Abstract [en]

    The aim of this research is to determine the optimal rotation age of Populus deltoides plantations regarding to the timber and carbon sequestration values in the north of Iran. Two plantation types with a tree density of 3 by 3 m and of 3 by 4 m were considered in Choobar forest, northern Iran. Net present value (NPV) of timber and carbon were used for determining the optimal rotation age. Data on volume increment, carbon content, revenue, timber and carbon prices were collected to estimate NPV. In this study, we considered the effects of different plantation cost, land value and discount rates on the optimal rotation ages. Our results indicated, if economic value of timber is considered, optimal rotation ages were 10 and 8 years for 3 by 3 m and 3 by 4 m density, respectively. Optimal rotation ages considering carbon sequestration, in addition to timber value, increased to 14 and 11 years for the same two densities, respectively. Thus, integrating carbon sequestration value with timber economic value increased the optimal rotation ages and in turn change the optimal forest management. Sensitivity analysis indicate that optimal rotation ages increased with increasing plantation cost and decreased with increasing interest rate, while our results suggested that the optimal rotation age is not sensitive to the land value. Our results are important for land managers and carbon projects to optimize the used forest management practices.

  • 2.
    Mohammadi Limaei, Soleiman
    et al.
    Univ Guilan, Sowmeh Sara, Iran.
    Safari, Ghazaleh
    Iranian Natl Tax Adm, Karaj, Iran.
    Merceh, Goljahan Mohammadi
    Islamic Azad Univ, Rasht, Iran.
    Non-market valuation of forest park using travel cost method: (case study: Saravan forest park, north of Iran)2017In: Austrian Journal of Forest Science, ISSN 0379-5292, E-ISSN 1815-3704, Vol. 134, no 1, p. 53-74Article in journal (Refereed)
    Abstract [en]

    The aim of this research was to evaluate the non-market products of a forest park in north of Iran. Required socio-economics data were collected using questionnaires. Travel cost method was used to estimate the economics and recreational values. Regression analysis was used to estimate some socio-economics variables on behavior of forest park visitors. The economics and recreational values of forest park calculated via the demand function. The results of regression analysis showed that the variables such as required time to access the site, travel cost, monthly income, age and education effect on visiting people to the forest park. The results showed that there is a linear relation between required time to access the park and number of visitors. The results indicated that there is a polynomial relation between the number of visitors and the travel cost. The results of regression analysis showed that there is a third degree polynomial relation between the number of visitors and income. Furthermore, the results of demand function showed that the daily value of recreational site or consumer surplus is 68319800 Iranian Rials. The results of this study can be a powerful tool to improve the quality of environmental services and expand service and infrastructure quality of the study area.

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