تعیین سن بهره‌برداری با توجه به بهینه‌سازی ارزش خالص فعلی سری‌های دوره‌ای متناهی چوب و ترسیب کربن در جنگلکاری‌های صنوبر (Populus deltoides Marshall) استان گیلان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار پژوهشکدۀ محیط زیست جهاد دانشگاهی، رشت، ایران

2 دانشیار دانشکدۀ کشاورزی و منابع طبیعی اهر، دانشگاه تبریز

3 رئیس ادارۀ جنگلداری ادارۀ کل منابع طبیعی و آبخیزداری استان گیلان، رشت، ایران

چکیده

در این تحقیق برای تعیین سن بهینۀ بهره‌برداری از مدل توسعه‌یافتۀ فاستمن به‌منظور تعیین ارزش‌های چوبی و غیرچوبی در جنگل‌های همسال استفاده شده است. چهار منطقۀ جنگلکاری صنوبر از غرب (حفظ‌آباد تالش)، مرکز (چوبر شفت)، شرق (چالشم سیاهکل) و ساحل (چاف و چمخالۀ لنگرود) استان گیلان انتخاب شدند. رویش حجم با استفاده از نتایج آنالیز تنه و مقدار کربن اندام‌های هوایی با استفاده از روش احتراق محاسبه شد. سپس ارزش خالص فعلی چوب و ترسیب کربن برای سری‌های دوره‌ای متناهی با استفاده از رویش حجمی و اندوختۀ کربن، نرخ تنزیل، قیمت تعدیل‌شدۀ چوب با استفاده از مدل خودکاهشی مانا، قیمت تعدیل‌شدۀ کربن با استفاده از مدل خودکاهشی نامانا، درآمد نهایی و هزینۀ نهایی محاسبه شد. سن بهینۀ بهره‌برداری با در نظر گرفتن ارزش خالص فعلی چوب در این مناطق از 6 تا 9 سال و با در نظر گرفتن ارزش خالص فعلی کربن از 11 تا 15 سال و ارزش خالص فعلی چوب و کربن به‌طور توأم 7 تا 10 سال به‌دست آمد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Rotation Age of Populus deltoides Marshall. Based on Optimizing Net Present Value of Timber and Carbon Sequestration at the Finite Series of Identical in Guilan

نویسندگان [English]

  • T Abedi 1
  • H.R. Maskani 1
  • R Abedi 2
  • B Bakhshandeh 3
1 Assistant prof., Environmental Research Institute, Academic Center for Education, Culture and Research, Rasht, Iran
2 Associate Prof., Dept. of Forestry, Ahar Faculty of Agriculture and Natural Resources, University of Tabriz, Iran
3 General Dept. of Natural Resources and Watershed Management of Guilan Province, Rasht, Iran
چکیده [English]

The aim of this study was to determine the optimal rotation age of even-aged forests with respect to timber and non-timber values by developing the Faustmann model. We conducted the study in four regions of Populus deltoides Marshall. plantations located in the west (Hefz-Abad in Talesh), center (Choobar in Shaft), east (Chalesham in Siahkal), and coastal region (Chaf-chamkhaleh in Langeroud) of Gilan province. We determined the volume increment by the stem analysis method and carbon sequestration by combustion in an electric oven. Then, Net Present Value (NPV) of timber and carbon sequestration is calculated by using volume increment, carbon amount, discount rate, adjusted timber price by stationary autoregressive model, carbon price by non-stationary model, the marginal revenue and marginal cost at the finite series of identical. Results showed that when the economic value of timber is considered, optimal rotation ages are 6-9 years. Optimal rotation ages when carbon sequestration is considered increased to 11-15 years. Integration of carbon sequestration value into timber economic value increased the optimal rotation ages to 7-10 years.

کلیدواژه‌ها [English]

  • Adjusted Price
  • Carbon Value
  • Increment
  • Marginal Revenue
  • Stem Analysis
 
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