معادلات آلومتریک زی‌توده و اندوخته کربن بذر بلوط ایرانی (Quercus brantti) و تعیین عناصر غذایی آن در جنگل‌های لردگان استان چهارمحال و بختیاری

نوع مقاله: علمی- پژوهشی

نویسندگان

1 دانشجوی دکتری جنگلداری، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس

2 دانشیار، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس

3 دانشیار پژوهش، مؤسسه تحقیقات جنگلها و مراتع کشور

4 استادیار، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس

چکیده

ترسیب کربن به‌عنوان یکی از مهمترین مزایای درختان در اکوسیستم‌های جنگلی بوده که در اندام‌های مختلف آنها ازجمله بذر انجام می‌شود. اختصاص کربن در اندام‌های مختلف به‌عنوان یک فرایند کلیدی در چرخة کربن محسوب می‌شود. مقدار کربن موجود در هر اندام، زمان باقی ماندن کربن در اکوسیستم و چرخة کربن آن را تعیین می‌کند. بذر بلوط ایرانی (Quercus brantti) در جنگلهای زاگرس از جنبه‌های مختلفی حائز اهمیت است. علاوه بر ارزش‌های تغذیه‌ای، دارویی و اکولوژیک، زی‌توده و مقدار اندوختة کربن این بخش از درخت از اهمیت ویژه‌ای برخوردار است. در این تحقیق که در جنگلهای استان چهارمحال و بختیاری انجام شد، تعداد 35 پایه بلوط ایرانی در دو شکل تک‌پایه و جست‌گروه به‌صورت تصادفی انتخاب و آماربرداری از صفات کمی کلیة پایه‌ها انجام شد. سپس بذر تمامی پایه‌ها به‌صورت جداگانه برداشت شده و وزن تر آنها در عرصه اندازه‌گیری شد. وزن خشک نمونه‌ها، مقدار کربن و سایر عناصر غذایی موجود در بذر نیز در آزمایشگاه مورد اندازه‌گیری قرار گرفت. نتایج این تحقیق نشان داد که زی‌تودة بذر در درختان تک‌پایه به‌طور متوسط 6 برابر جست‌گروه‌ها است. همچنین مقدار کربن بذر حدود 40 درصد وزن خشک آن است. نتایج بررسی مدل‌های رگرسیونی نشان داد که در درختان تک‌پایه از بین متغیرهای مستقل، قطر متوسط تاج معادلاتی با شاخص‌های مدل‌سازی بهتری تولید کرد، در حالی‌که در جست‌گروه‌ها بهترین مدل رگرسیونی بدست آمده، مدل رگرسیونی توانی بر مبنای ارتفاع کل جست‌گروه است. بسیاری از مدل‌های بدست آمده از ضریب تبیین بالایی برخوردار بودند که حکایت از امکان استقرار معادلات آلومتریک مناسب برای زی‌توده و اندوختة کربن بذر بلوط ایرانی داشت.

کلیدواژه‌ها


عنوان مقاله [English]

Allometric equations of biomass and carbon stocks for Quercus brantti acorn and its nutrition elements in Lordegan, Chaharmahal Va Bakhtiari

نویسندگان [English]

  • Ya'ghoub Iranmanesh 1
  • Seyyed Gholam Ali Jalali 2
  • Khosro Sagheb-Talebi 3
  • Seyyed Mohsen Hosseini 2
  • Hormoz Sohrabi 4
1 Ph.D. student, Faculty of Natural Resources and Marine Sciences, University of Tarbiat Modares
2 Associate professor, Faculty of Natural Resources and Marine Sciences, University of Tarbiat Modares
3 Associate professor, Research Institute of Forests and Rangelands
4 Assistant Professor, Faculty of Natural Resources and Marine Sciences, University of Tarbiat Modares
چکیده [English]

 
Carbon sequestration in different organs such as seed is one of the most important benefits of trees at forest ecosystems. Allocation of carbon within different tree organs is a key process in Carbon cycle. The amount of carbon at each organ, defines its residence time at ecosystem and its cycling. Acorn is important in different aspects at Zagross forests. In addition to its medical, ecological and nutritional value, the seeds have a special importance in terms of carbon sequestration and biomass production. In trial which was carried out in Chaharmahal Va Bakhtiari province of I.R. Iran, 35 individual trees of Quercus brantti Lindl. Were chosen randomly at standard and coppice forests and their quantitative characteristics were measured. After that, the acorns of the trees were harvested separately and the total wet weights was measured at field. The acorn’s dry weight, carbon deposit and nutrition elements were identified in laboratory. The results indicated that the acorn biomass of the standard trees was six times more than the coppice ones and its carbon deposit was 40% of its dry weight. Allometric models were created for the standard and coppice trees. The results of the regression models showed that the average crown diameter developed better equation with the modeling parameters of the standard trees than the coppice ones, whereas in the coppice trees, the best equation was developed by power regression model, based on shoots total height. Overall, there was several precise and suitable allometic models for acorn’s seed biomass and carbon deposit.

کلیدواژه‌ها [English]

  • Carbon sequestration
  • seed
  • Acorn
  • coppice and standard types
  • nutrition element
  • crown diameter
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