زی‌توده و اندوخته کربن روی‌ زمینی در دو فرم رویشی بلوط‌ ایرانی (Quercus brantii Lindl) در جنگل‌های لردگان استان چهارمحال و بختیاری

نوع مقاله : علمی- پژوهشی

نویسندگان

1 هیات علمی مرکز تحقیقات چهارمحال و بختیاری

2 هیات علمی موسسه تحقیقات جنگلها و مراتع کشور

3 هیات علمی دانشگاه تربیت مدرس

چکیده

اندازه‌گیری زی‌توده درختی یک شاخص بسیار مهم برای ارزش‌گذاری فرآیندهای اقتصادی و بوم‌شناختی مانند چرخه عناصر غذایی، تولید جنگل و ذخیره سوختی محسوب می‌شود. این تحقیق با هدف اندازه‌گیری مقدار زی‌توده و اندوخته کربن روی‌زمینی در دو فرم رویشی بلوط ‌ایرانی (Quercus brantii) در جنگل‌های استان چهارمحال و بختیاری انجام شد. به این منظور قطعات‌نمونه آماربرداری یک‌هکتاری تعیین و به‌صورت منظم- تصادفی پیاده شدند. سپس در هر قطعه‌نمونه یک پایه بلوط (تک‌پایه یا جست‌گروه) در طبقات قطری و تاجی مختلف انتخاب شد. در مجموع 30 قطعه‌نمونه آماربرداری و 30 پایه بلوط (16 درخت تک‌پایه و 14 جست‌گروه) مشخص شد. درختان نمونه نشانه‌گذاری شده و ‌صفات کمی موردنیاز اندازه‌گیری شدند، سپس عملیات قطع و جداسازی درختان به قسمت‌های مختلف انجام شد. قسمت‌های مختلف درختان بلافاصله پس از قطع در عرصه توزین شده و نمونه‌برداری برای اندازه‌گیری وزن خشک و مقدار کربن انجام شد. نتایج این پژوهش ضمن اینکه میانگین زی‌توده و اندوخته کربن دو فرم رویشی بلوط ایرانی را به‌تفکیک قسمت‌های درخت نشان می‌دهد، این مقادیر را در طبقه‌های قطری و تاجی مختلف ارائه می‌دهد که در واقع نوعی تاریف زی‌توده و کربن به‌حساب می‌آیند. متوسط زی‌توده روی‌زمینی در هر درخت در فرم تک‌پایه و جست‌گروه بلوط به‌ترتیب 374/1 و 146/3 کیلوگرم به‌دست آمد که نشان‌دهنده 2/5 برابربودن متوسط زی‌توده در درختان تک‌پایه نسبت به جست‌گروه‌هاست. تخصیص زی‌توده به قسمت‌های مختلف درختان تک‌پایه و جست‌گروه از دیگر نتایج این پژوهش است.

کلیدواژه‌ها

عنوان مقاله [English]

Biomass and carbon Stocks of Brant's oak (Quercus brantii Lindl.) in two vegetation forms in Lordegan, Chaharmahal & Bakhtiari Forests

نویسندگان [English]

  • Yaghoub Iranmanesh 1
  • Khosro Sagheb Talebi 2
  • Hormoz Sohrabi 3
  • Seyyed Gholamali Jalali 3
  • Seyyed Mohsen Hosseini 3
1 Assistant Prof., Agricultural and Natural Resources Research Center of Chaharmahal and Bakhtiari ‎Province, Shahrekord, I.R. Iran
2 Associate Prof., Research Institute of Forests and Rangelands, Tehran, I.R. Iran.‎
3 Associate Prof., Faculty of natural Resources, University of Tarbiat Modares, Noor, I.R. Iran.‎
چکیده [English]

Estimates of tree biomass are useful in assessing forest structure and evaluating ecological and economic processes such as nutrient cycle, forest productivity and fuel inventories. The information on tree biomass is required to assess the amount of carbon held in trees. This research was conducted in order to measure biomass and Carbon stocks of two vegetation forms of Brant's oak (Quercus brantii)  in Chaharmahal & Bakhtiari Forests in west of Iran. Therefore, sample trees were selected to be felled using 30 randomized systematic plots. Thirty trees including 16 individuals with single stem and 14 sprout-clumps were randomly selected. Quantitative and qualitative traits were measured before felling. The felled trees were separated into six different components and weighed on a portable hanging scale in the field in order to obtain the fresh weight. Samples were taken from each tree component. The samples were weighed on a scale with 0.01 gr accuracy and transported to a laboratory. According to results, biomass of single stem trees was 2.5 times more than coppice forms. Moreover, biomass allocation of single stem trees and coppice trees were identified.

کلیدواژه‌ها [English]

  • Quercus brantii
  • Chaharmahal & Bakhtiari
  • biomass
  • vegetation form
  • Carbon

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