برآورد موجودی و ارزش اقتصادی اندوختۀ کربن ریشه و کندۀ درختان Populus deltoides در صنوبرکاری‌های استان گیلان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استاد گروه جنگلداری، دانشکدۀ منابع طبیعی، دانشگاه گیلان، صومعه‌سرا، ایران.

2 دانش‌آموخته دکتری جنگلداری، دانشکدۀ منابع طبیعی، دانشگاه گیلان، صومعه‌سرا، ایران.

3 دانش‌آموخته کارشناسی ارشد جنگلداری، دانشکدۀ منابع طبیعی، دانشگاه گیلان، صومعه‌سرا، ایران

4 دانشیار گروه جنگلداری، دانشکدۀ منابع طبیعی، دانشگاه گیلان، صومعه‌سرا، ایران.

10.22034/ijf.2021.274498.1765

چکیده

جنگل‌ها از مهم‌ترین مخازن کربن در زمین به‌شمار می‌روند و اندوخته شدن کربن در زی‌تودۀ گیاهی ساده‌ترین و به لحاظ اقتصادی عملی‌ترین راهکار برای کاهش دی‌اکسید کربن اتمسفری است. هدف این پژوهش، تعیین زی‌توده و اندوختۀ کربن کنده و ریشۀ درختان صنوبر دلتوئیدس (Populus deltoids Marshall) در صنوبرکاری‌های تنیان در استان گیلان بود. بدین ‌منظور براساس روش نمونه‌برداری انتخابی، 15 اصله درخت انتخاب شد. پس از عملیات قطع و خروج گرده‌بینه‌ها، به‌منظور خارج کردن کنده و ریشه‌ها از خاک از یک دستگاه بیل مکانیکی استفاده شد. پس از جدا کردن کنده و ریشه، با استفاده از دستگاه ترازوی دیجیتال، اندام‌های کنده و ریشه توزین شد. سپس نمونه‌هایی از اندام‌های مختلف درختان صنوبر (کنده و ریشه) به‌منظور برآورد مقدار زی‌توده و اندوختۀ کربن جدا و توزین شد. پس از خشک کردن در داخل آون (با دمای 80 درجۀ سانتی‌گراد)، وزن خشک نمونه‌ها تعیین شد. پس از سوزاندن مقدار کافی از نمونه‌های خشک‌شده در کورۀ الکتریکی، وزن مواد آلی و مقدار کربن نمونه‌های کنده و ریشه به‌دست آمد. نتایج نشان داد که متوسط زی‌تودۀ کنده، زی‌تودۀ ریشه، اندوختۀ کربن کنده و اندوختۀ کربن ریشه برای گونه صنوبر به‌ترتیب 15/2، 18/22، 05/1 و 94/10 کیلوگرم به‌ازای هر اصله درخت به‌دست آمد. نتایج نشان داد که همبستگی مثبت و معنی‌داری بین مقدار زی‌توده و اندوختۀ کربن کنده و ریشۀ گونۀ صنوبر با متغیر قطر یقه وجود دارد. مقدار کربن ترسیب‌یافته در اندام‌های ریشه و کنده 836/3 تن در هکتار و ارزش اقتصادی آن در هر هکتار 68/46723015 ریال محاسبه شد.

کلیدواژه‌ها


عنوان مقاله [English]

Estimation stock and economic value of carbon storage of root and stump of Populus deltoids in poplar plantation of Guilan province

نویسندگان [English]

  • R Naghdi 1
  • M Mirzaei 2
  • A.H. Aghajani 3
  • J Torkaman 4
1 Prof., Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Iran
2 Ph.D. Graduated in Forestry Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Iran
3 MS.c. Graduated in Forestry Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Iran
4 Associate Prof., Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Iran
چکیده [English]

Trees are one of the most important carbon reservoirs on the earth and carbon sequestration into plant biomass is an easiest and economically most practical way for mitigating the CO2 from atmosphere. This study aims at determining the biomass and carbon storage in stump and roots of Populus deltoides in Tanian poplar plantations of Guilan province. For this purpose, 15 poplar trees were selected based on selection sampling method 15. After the cutting and moving the logs from the stump to somewhere outside the plantation, excavator machinery (KOMATSU PC 200) was used to remove the stumps and roots from the soil. After separating the stumps and roots, mentioned parts were weighed using a digital scale. In order to estimate the amount of biomass and carbon storage, some samples of various components of poplar trees were then fallen down and weighed. After drying the samples in oven (80 ̊C), the dry weight of the samples was determined. After burning an enough amount of dried samples in the electric kiln, the weight of organic matter and carbon of the stump and root samples were obtained. Results showed that the mean of stump biomass, root biomass, stump and root carbon sequestration for each tree were 2.15, 22.18, 1.05 and 10.94 kg per tree, respectively. Results indicated there was a positive and significant correlation between the biomass and carbon sequestration of stump and root with collar diameter. The amount of carbon storage in the root and stump parts was 3.836 tons per hectare and the economic value of carbon storage was calculated as 46723015.68 Rials per hectare.

کلیدواژه‌ها [English]

  • Carbon sequestration
  • Afforestation
  • Biomass
  • Allometric equations
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