تأثیر شدت چرا بر پتانسیل ترسیب کربن گونهArtemisia sieberi (مطالعه موردی مراتع چاه ماری شهرستان بهبهان)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار، دانشکده منابع طبیعی، دانشگاه صنعتی خاتم الانبیاء(ص)، بهبهان، ایران

2 استادیار، دانشکده منابع طبیعی، دانشگاه کشاورزی و منابع طبیعی رامین خوزستان، اهواز، ایران.

3 دانشیار، بخش تحقیقات مرتع، مؤسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران

چکیده

کاهش بیوماس گیاهی در اکوسیستم‌ها ی جنگلی و مرتعی به هر دلیلی می‌تواند بر روند ترسیب کربن و در نتیجه گرمایش زمین تأثیرگذار باشد. مطالعه حاظر با هدف ارزیابی ذخیره‌سازی کربن تحت شدت‌های متفاوت چرای دام در مراتع چاه ماری شهرستان بهبهان در استان خوزستان با غالبیت گونه   A. sieberi انجام گردید. سه منطقه با شدت چرای شدید، متوسط و کم با در نظر گرفتن تمامی ویژگی‌های توپوگرافی (شیب، جهت و ارتفاع)، بارندگی، خاک و اقلیم یکسان انتخاب شدند. نمونه‌برداری از پوشش گیاهی به روش تصادفی – سیستماتیک در قالب 60 پلات یک متر‌مربعی و در طول سه ترانسکت 100 متری در منطقه معرف صورت گرفت. به منظور بررسی میزان کربن زیتوده هوایی و زیرزمینی اقدام به نمونه‌برداری کامل از زیتوده اندام هوایی و زیرزمینی گردید و کربن گیاه با استفاده از روش احتراق تعیین شد. تجزیه و تحلیل داده‌ها به کمک نرم‌افزار  SPSS v. 16، مقایسه داده‌ها در شدت‌های چرایی از طریق آزمون تجزیه واریانس یکطرفه و میانگین صفات مورد بررسی با آزمون دانکن مقایسه شدند. نتایج نشان داد که بین شدت‌های چرایی مختلف میزان کربن آلی گیاه از منطقه با شدت چرای کم به منطقه با شدت چرای زیاد میزان آن کاهش یافته و از 3/5704 به 1/3470 رسیده است. همچنین بین تیمارهای مختلف از نظر ذخیره کربن در اندام‌های هوایی و زیرزمینی اختلاف معنی‌داری وجود داشت و ذخیره کربن در زیتوده هوایی در شدت چرای کم 9/4360 و در زیتوده زیرزمینی 5/2180 بود.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of grazing on carbon sequestration potential in Artemisia sieberi (case study: Chah Mary ranges in Behbahan)

نویسندگان [English]

  • Somayeh Dehdari 1
  • Masoomeh Movaghari Rodposhti 2
  • Zohreh Khorsandi Koohanestani 1
  • Ali Ehsani 3
1 Assistant Professor, Faculty of Natural Resources, Behbahan Khatam Alanbia University of Technology, Iran
2 Assistant Professor,Faculty of Natural Resources, Ramin Agriculture and Natural Resources University, Ahwaz, Iran
3 Associate Professor, Research Range Division, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO),Tehran, Iran
چکیده [English]

    The reduced biomass in forests and rangelands ecosystems for any reason can affect the process of carbon sequestration and as a result of global warming. This study was conducted to assess carbon storage under different grazing intensities in rangeland of Chah Mary dominated with Artemisia siberi in Khuzestan province. Three sites under heavy, moderate and low grazing intensities were selected based on similar topographic features (slope, aspect and elevation), rainfall, soil and climate. Plant sampling was done in key areas by random-systematic method along three transects of 100m and 60 plots of 1m2. Then, aerial and underground biomass parameters were evaluated in each plot and carbon was determined by ash method. The data were analyzed by SPSS v.16 software. According to the results, carbon sequestration decreased from 5704/3 in the low-grazing region to 3470/1 in the high-grazing region. Also, under low-grazing intensity, the carbon stored in aerial biomass and underground biomass was 4360/9 and 2180/5, respectively.

کلیدواژه‌ها [English]

  • Carbon dioxide
  • global warming
  • Rangeland ecosystem
  • Plant vegetation
  • Khuzestan

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