وضعیت مشخصه‌های فیزیکی–شیمیایی و ذخیرة کربن خاک توده‌های جنگلی در استان کردستان (مطالعة موردی: شهرستان مریوان)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 بخش تحقیقات جنگل‌ها و مراتع، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان کردستان، سازمان تحقیقات، آموزش و ترویج کشاورزی، سنندج، ایران.

2 بخش تحقیقات جنگل‌ها و مراتع، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان چارمحال و بختیاری، سازمان تحقیقات، آموزش و ترویج کشاورزی، شهرکرد، ایران.

3 خش تحقیقات جنگل، مؤسسة تحقیقات جنگل‌ها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران.

10.22059/jfwp.2024.369508.1272

چکیده

جنگل‌های زاگرس از نظر سطح به‌عنوان دومین بوم‌سازگان جنگلی کشور شناخته شده‌اند و دارای خدمات بوم‌سازگانی متعددی ازجمله ذخیرة کربن هستند. خاک‌ها بزرگ‌ترین مخزن ذخیرة کربن در بوم‌سازگان‌های خشک هستند. هدف این پژوهش، بررسی وضعیت ذخیرة کربن خاک توده‌های جنگلی شاخه‌زاد (قرق و شاخص استان کردستان) در جنگل‌های شهرستان مریوان بود. در این راستا، دو رویشگاه گاران (تودة قرق) و دوله‌ناو (تودة شاخص و الگو) جنگل ­های استان در شهرستان مریوان (شمال غرب استان کردستان) انتخاب شدند. در هر رویشگاه، از یک قطعه‌نمونة مربعی شکل یک هکتاری، پنج نمونه خاک از عمق 30-0 سانتی‌متری برداشت و در آزمایشگاه مشخصه‌های فیزیکی- شیمیایی خاک، تنفس میکروبی، درصد کربن آلی و مقدار ذخیرة کربن نمونه‌ها اندازه‌گیری شد. با توجه به نرمال بودن داده‌ها، از آزمون تی مستقل برای مقایسة میانگین پارامترهای مورد مطالعه در دو رویشگاه استفاده شد. نتایج نشان داد که درصد کربن آلی و ذخیرة کربن در رویشگاه گاران با مقادیر 3/63 درصد و 104/3 تن در هکتار، با اختلاف معنی‌داری بیشتر از رویشگاه دوله‌ناو بود (2/63 درصد و 86/7 تن در هکتار). همچنین، مقادیر پارامترهای درصد سنگ‌ریزه، تنفس میکروبی و نسبت C/N در رویشگاه گاران (به‌ترتیب 37/3 درصد، 472/9 میلی‌گرم دی‌اکسید کربن در کیلوگرم و 13/1) بیشتر از رویشگاه دوله‌ناو بود. نتایج کلی پژوهش نشان داد که ذخیرة کربن در رویشگاه گاران (تحت مدیریت قرق) بیشتر از رویشگاه دوله‌ناو بود. اعمال مدیریت قرق و حفاظت جنگل سبب افزایش درصد کربن آلی و مقدار ذخیره کربن خاک می‌شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigating the physico-chemical and carbon storage in soil of forest stands in Kurdistan province (Case study: Marivan county, west of Iran)

نویسندگان [English]

  • Maziar Haidari 1
  • Yaghoub Iranmanesh 2
  • Mehdi Pourhashemi 3
1 Forests and Rangelands Research Department, Kurdistan Agricultural and Natural Resources Research and Education Center, AREEO, Sanandaj, Iran.
2 Forests and Rangelands Research Department, Chaharmahal and Bakhtiari Agricultural and Natural Resources Research and Education Center, AREEO, Shahrekord, Iran.
3 Forest Research Division, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran.
چکیده [English]

The Zagros forests are known as the second-largest forest ecosystems in the country in terms of surface area, and they provide many ecosystem services such as carbon storage. Soils are the largest reservoir of carbon storage in dry ecosystems. The purpose of this study was to investigate the carbon storage status of coppice oak stands (exclosure and non-protected stands). In this regard, two forest stands, Garan (an exclosure area) and Dolah Naw (a typical forest of Kurdistan province), were selected in Marivan county, Kurdistan province. A square sample plot of one hectare was considered randomly in each stand. In each plot, five soil samples were taken from a depth of 0-30 cm, and physico-chemical characteristics of the soil, microbial respiration, and organic carbon percentage were measured in the laboratory. Considering the normality of the data, the independent t-test was used to compare the averages of the study parameters in the two plots. The results showed that the percentage of organic carbon and carbon storage in the Garan, with values of 3.63% and 104.3 tons per hectare, respectively, was significantly higher than that of the Dolah Naw (with 2.63% and 86.7 tons per hectare). Additionally, the parameter values of gravel percentage, microbial respiration, and C/N ratio in the Garan (37.3%, 472.9 mg CO2/kg, and 13.1, respectively) were higher than those in the Dolah Naw. The general results of the research showed that carbon storage in the Garan stand (under protection management) exceeded that of the Dolah Naw. As a result, exclosure and forest protection increases the percentage of carbon storage and the amount of soil carbon storage.

کلیدواژه‌ها [English]

  • Dolah Naw habitat
  • Garan habitat
  • Microbial respiration
  • Nitrogen percentage
  • Organic carbon percentage
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