همکاری با انجمن علمی مدیریت و کنترل مناطق بیابانی ایران

نوع مقاله : مقاله پژوهشی

نویسنده

بخش تحقیقات جنگل و مرتع، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان سمنان، سازمان تحقیقات، آموزش و ترویج کشاورزی، سمنان، ایران

چکیده

ترسیب کربن در اندام‌های گیاهی و خاک از راه‌های موثر در تعدیل خطرات تغییر اقلیم در سطح جهان است. در این مطالعه اثر اجرای عملیات بیومکانیکی (بذرکاری با گونه Agropyrum elongatum در پشت گابیون­ها) بر میزان ذخیره کربن در مراتع حوضه آبخیز سد کارده مشهد، مورد بررسی قرار گرفته و سپس با مراتع طبیعی و قسمت‌های تثبیت نشده آبراهه مقایسه شده است. در نقاط معرف نمونه‌برداری از خاک، زی­توده هوایی و زیرزمینی گیاهان غالب و همچنین لاشبرگ، بصورت سیستماتیک - تصادفی انجام شد و نمونه‌ها از نظر میزان ذخیره­‌ کربن مورد آزمایش قرار گرفتند. مقدار ترسیب کربن تیمار بیومکانیکی طی سالهای 1392- 1375 از تفاضل ذخیره کربن در این تیمار و قسمت تثبیت نشده آبراهه محاسبه شده است. به­طور کلی ذخیره کربن تیمار بیومکانیک در زی­توده هوایی و ریشه گیاهان، لاشبرگ و تا عمق 50 سانتیمتری خاک، معادل 23/16 و مقدار کربن ترسیب شده در این تیمار 69/5 تن در هکتار برآورد شد. ذخیره کربن در مراتع طبیعی و آبراهه تثبیت نشده نیز به ترتیب 07/54 و 61/10 تن در هکتار بوده است. در مجموع اجرای عملیات بیومکانیکی در این حوضه با حفاظت خاک و تقویت پوشش گیاهی، ذخیره سازی و ترسیب کربن در اراضی فرسایش یافته را بهبود بخشیده است.

کلیدواژه‌ها

عنوان مقاله [English]

Investigating the effect of biomechanical operations on carbon stocks and sequestration in the Kardeh basin

نویسنده [English]

  • Somayeh Naseri

Forests and Rangelands Research Department, Semnan Agricultural and Natural Resources Research and Education Center, AREEO, Semnan, Iran

چکیده [English]

Carbon sequestration in soil and plant tissues is an effective way for climate change mitigation in the world. In this study, the effect of biomechanical operations (gabions which planted by Agropyrum elongatum) on carbon sequestration were examined in the rangelands of Kardeh basin, Mashhad and compared with natural rangelands and non- established waterways. In each treatment, Sampling from soil in two depths, above-below biomass of dominant species and litter were done by a systematic - randomly method and analyzed for carbon stocks. Carbon sequestration in biomechanical treatment during 1996- 2014 has been calculated by subtracting carbon stocks in this treatment and non- established waterways. Generally, total carbon stocks in biomechanical operation (above- below biomass, litter and soil up to 50 cm depth) is 16.23 ton/ha and carbon sequestration in this treatment during these years is 5.69 ton/ha. Also, carbon stocks in natural rangelands and non- established waterways is 54.07 and 10.61 ton/ha respectively. Overall, implementation of biomechanical practices in Kardeh basin in addition to soil conservation and restoration of vegetation,has improved the economic value of eroded lands in terms of carbon stocks and sequestration.

کلیدواژه‌ها [English]

  • Carbon stocks
  • range improvement practices
  • natural rangelands
  • soil conservation
  • vegetation
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