بررسی دقت برآورد ترسیب کربن روی زمینی پلت (Acer velutinum Bioss.) در جنگل‌های هیرکانی با استفاده از روش‌های تخریبی و غیرتخریبی

نوع مقاله: علمی- پژوهشی

نویسندگان

1 دکتری جنگل‌داری، مؤسسه تحقیقات جنگلها و مراتع کشور

2 کارشناس ارشد جنگل‌داری، صنایع چوب و کاغذ مازندران

3 کارشناس ارشد جنگل‌داری، اداره کل منابع طبیعی و آبخیزداری نوشهر

چکیده

 خشکسالی و بحران محیط زیستی ناشی از پدیده گرمایش زمین و تغییرات اقلیم یکی از مهم‌ترین چالش‌های عصر حاضر محسوب می‌شود. از آنجایی‌که جذب دی‌اکسیدکربن اتمسفر به‌عنوان مهم‌ترین عامل گرمایش زمین در اکوسیستم‌های جنگلی بسیار مهم است، برآورد صحیح ترسیب کربن در اجزای درختان یکی از راه‌حل‌های مهم برای برنامه‌ریزی و مدیریت بحران پیش‌رو است. در پژوهش پیش‌رو 20 درخت پلت (Acer velutinum Bioss.) با حداکثر چهار تکرار در طبقات قطری مختلف در جنگل‌های اشتروش چمستان انتخاب شدند و پس از قطع به دو قسمت تنه و تاج تقسیم‌بندی شدند. سپس چگالی ویژه و ضریب کربن بخش‌های مختلف آنها به‌دست آمد. برآورد روش غیرتخریبی ترسیب کربن از حاصل‌ضرب حجم بخش‌های مختلف (تنه، تاج)، چگالی ویژه و ضریب کربن به‌دست آمد. مدل‌سازی آلومتریک نیز با استفاده از روش توزین کلیه بخش‌های استحصال‌شده با استفاده از اندازه‌گیری ضریب خشکی هر بخش انجام شد. نتایج به‌دست‌آمده از آزمون تجزیه واریانس نشان داد که ضریب کربن اندازه‌گیری‌شده بین بخش‌های مختلف درخت معنی‌دار نبود، در صورتی‌که تغییرات چگالی ویژه بین تاج و بخش‌های پایینی و میانی تنه درختان معنی‌دار بود. مدل‌سازی آلومتریک نشان داد که مدل نمایی بازتبدیلی شامل قطر برابر سینه و قطر تاج به‌عنوان مدل بهینه با حداکثر دقت پیش‌بینی ترسیب کربن روی زمینی درختان پلت بود. برای مقایسه دقت برآورد روش‌های مذکور، نتایج به‌دست‌آمده از آزمون t جفتی بین مشاهدات و برآورد به‌دست‌آمده از روش غیرتخریبی نشان داد که برآورد ترسیب کربن روی زمینی (زی‌توده تنه + زی‌توده تاج) درختان پلت دارای عدم قطعیت زیاد و غیر قابل اعتماد بود. درمقابل، نتایج آزمون t جفتی بین خروجی‌های کلیه مدل‌ها و مشاهدات نشان داد که آلومتریک بهینه ترسیب کربن روی زمینی درختان پلت با حداکثر اعتماد دارای قطعیت برآورد بود.

کلیدواژه‌ها


عنوان مقاله [English]

Comparing the estimated accuracy of destructive and non-destructive methods of aboveground carbon sequestration of velvet maple (Acer velutinum Boiss.) in Hyrcanian forests

نویسندگان [English]

  • Ali Asghar Vahedi 1
  • Khashayar Salar 2
  • Alireza Bijaninejad 3
1 Ph.D. Forestry, Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO)
2 M.Sc. Forestry, Wood & Paper Industry of Mazandaran
3 M.Sc. Forestry, Nowshahr Natural Resources and Watershed Management Office
چکیده [English]

Drought and environmental crisis caused by climate change are amongst the most crucial challenges in Iran. Due to the essential importance of absorbing CO2, the most crucial factor of global warming, in forest ecosystems, accurate estimation of carbon sequestration in different parts of the trees is of high significance for forest planning and management under climate change scenarios. In this study, 20 velvet maple (Acer velutinum Boiss.) individuals distributed in different diameter classes were initially felled and divided into separate parts of bole and crown. The specific wood density and carbon factor of each fraction and their product were directly calculated and used for non-destructive method to estimate above-ground carbon sequestration (AGC). Allometric equations were developed by weighing of harvested tree parts and measuring each section’s drought coefficient. The ANOVA revealed no tree-specific significant difference among carbon factors. However, the specific wood density was significantly different among the each part of tree individuals. Allometric models showed that the highest accuracy of AGC (R2adj = 0.98, RMS = 0.101, CF = 1.05) was achieved by the exponential model considered re-conversional equation that included DBH and crown diameter. The result of paired t-test showed that the non-destructive estimation method was associated with the highest uncertainty with the low confidence (S% = 318.4, t = -3.5). However, the result of paired t-test between the observations and predictions of the optimal allometric model here showed that the aforementioned model estimation was confident (S% = 22.6, t = 1.36).

کلیدواژه‌ها [English]

  • MAPLE
  • Carbon sequestration
  • specific wood density
  • Allometric equations
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