تأثیر جنگلکاری بر میزان ترسیب کربن خاک و زی توده گیاهی در مناطق خشک (مطالعه موردی: پارک جنگلی بختیاردشت اصفهان)

نوع مقاله : علمی- پژوهشی

نویسندگان

1 دانشجوی دکتری علوم مرتع، دانشگاه صنعتی اصفهان

2 هیات علمی دانشگاه آزاد اسلامی واحد خوراسگان

3 هیات علمی دانشگاه صنعتی اصفهان

چکیده

تغییر اقلیم و افزایش گرمایش جهانی یکی از چالش‌های مهم‌ در بحث توسعه پایدار است که ناشی از افزایش غلظت گازهای گلخانه‌ای است. ترسیب کربن در زی‌توده گیاهی و خاک‌های تحت آن، ساده‌ترین و از نظر اقتصادی عملی‌ترین راهکار ممکن به‌منظور کاهش ‌کربن اتمسفری محسوب می‌شود. با توجه به اینکه جنگل‌های شهری از قابلیت بالایی برای جذب کربن اتمسفری و تعدیل اقلیم برخوردارند، بنابراین برای برآورد ترسیب‌کربن گونه کاج تهران (Pinus eldarica) کاشته شده در پارک جنگلی بختیاردشت اصفهان، نمونه‌برداری از زی‌توده، خاک (در دو عمق صفر تا 15 و 15 تا 30 سانتی‌متری) و لاشبرگ به‌صورت تصادفی- منظم انجام شد. ترسیب کربن در زی‌توده گیاهی از طریق معادلات آلومتریک و کربن آلی خاک از روش والکی-بلاک تعیین شد. نتایج نشان داد کشت گونه کاج تهران در این منطقه منجر به افزایش ترسیب کربن به مقدار 4/422 تن در هکتار نسبت به زمین بایر اطراف شده، که ارزش اقتصادی آن در کل مساحت منطقه کشت‌شده، بیش از 5 میلیون دلار محاسبه شد. همچنین نتایج توزیع کربن نشان داد که تنه درختان بیشترین سهم (40 درصد) از ترسیب کربن کل را دارا می‌باشند. بنابراین با توجه به مزایای بسیار زیاد ترسیب کربن، ضروری است که با مدیریت و محافظت مناسب این جنگل‌ها، گام مثبتی به‌منظور کاهش تراکم کربن اتمسفری و در نتیجه کاهش گرمایش جهانی و تغییرات اقلیمی برداشته شود.

کلیدواژه‌ها

عنوان مقاله [English]

The impact of afforestation on soil carbon sequestration and plant biomass in arid areas (Case study: Bakhtiardasht forest park, Isfahan)

نویسندگان [English]

  • Ali Asghar Naghipour Borj 1
  • Hadi Radnezhad 2
  • Seyyed Hamid Matinkhah 3
1 Ph.D. Student in Range Sciences, Department of Natural Resources, Isfahan University of Technology, Isfahan, Iran
2 Scientific Member of Islamic Azad University, Khorasgan Branch, Isfahan, Iran.
3 Scientific Member, Department of Natural Resources, Isfahan University of Technology, Isfahan, Iran.
چکیده [English]

Climate change and global warming result in an increased amount of greenhouse gases and, therefore, are amongst the most important challenges for sustainable development. The increment in the amount of Carbon sequestrated as plant biomass as well as within the underlying soils is considered as the easiest way to reduce the atmospheric carbon, which can also be economically implemented. In this regard, urban forests play an essential role in the major cities by absorbing the atmospheric carbon. Here, the existing Pinus eldarica stands planted in Bakhtiardasht forest park of Isfahan were studied for their level of carbon sequestration. To perform the estimation, the biomass, soil (in depths of 0-15cm and 15-30cm) and litter were sampled in a randomly systematic design. The Carbon sequestration in plant biomass and the soil organic carbon were measured by means of allometric equation and Walkly-Black method, respectively. The results indicated that the Pinus eldarica plantation led to an increasing amount of sequestrated Carbon up to 422.4 tons per hectare as compared with the surrounding barren land. The economic value of the resulted Carbon across the entire plantation area was valuated to exceed 5 million USD. The fixed carbon was shown to be mostly stem from the trunk of trees (40 percent). This study concludes such Carbon sequestration to be amongst the essential requirements for existing and upcoming forest conservation plans as an effective step to decrease of atmospheric carbon and mitigate the climate change effects.

کلیدواژه‌ها [English]

  • Climate change
  • Carbon sequestration
  • afforestation
  • Bakhtiardasht forest park
  • Isfahan

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