نوع مقاله: مقاله پژوهشی

نویسندگان

1 گروه علوم خاک، دانشکده‏ی کشاورزی، دانشگاه شهید چمران اهواز، صندوق پستی: 613574331، اهواز ـ ایران

2 پژوهشکده‌ی کشاورزی هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی، صندوق پستی: 1498-31465، کرج- ایران

چکیده

امروزه به ­منظور کاهش مشکل گرمایش جهانی، خاک به ‏عنوان مخزنی برای ذخیره کربن در خشکی مطرح شده است. از این‌رو هدف این پژوهش بررسی نقش اقلیم بر میانگین زمان ماندگاری رادیوکربن در خاک‌­های سطحی و زیرسطحی بخش‌­هایی از مراتع استان خوزستان بوده است. برای این‏ منظور، مراتع در دو منطقه ایذه و رامهرمز با دو اقلیم متفاوت انتخاب شدند. در هر دو منطقه پروفیل شاهد به ­منظور تعیین خصوصیات فیزیکی و شیمیایی خاک، اشکال کربن و نسبت ایزوتوپی کربن-14 مطالعه گردید. نتایج نشان داد میانگین زمان ماندگاری اعماق متناظر در پروفیل رامهرمز با میانگین سالیانه بارندگی کم‌تر، بیش‌تر از پروفیل ایذه بود که دلیل آن می­‌تواند ورود بیش‌تر مواد آلی تازه در منطقه ایذه باشد. هم‌چنین برخلاف پروفیل منطقه ایذه، میانگین زمان ماندگاری کربن با عمق در منطقه رامهرمز افزایش نیافت که علت آن می‌‏تواند مقدار رس و رسوبی بودن منطقه باشد. در کل سن کربن-14 در افق­‌های سطحی مناطق مطالعه شده بیش‌تر تحت تأثیر عواملی مانند اقلیم‏، مدیریت اراضی و وجود اشکال کربن‏ حساس به تجزیه بود. لیکن در افق­‌های عمقی سن کربن بیش‌تر تابعی از سایر عوامل به ویژه نوع خاک، مقدار رس، موقعیت توپوگرافیک (فرسایشی یا رسوبی بودن) و تغییرات شدید پارامترهای خاک با عمق، مانند چگالی ظاهری، بود تا اقلیم منطقه.

کلیدواژه‌ها

عنوان مقاله [English]

14C Mean residence time of soil organic carbon under contrasting climates in some of rangelands of Khozestan province, Iran

نویسندگان [English]

  • A. Owji 1
  • A. Landi 1
  • M. Khodadadi 2
  • S. Hojati 1

1 Department of Soil Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz, P.O. Box: 613574331, Ahvaz-Iran

2 Nuclear Agriculture Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box: 31465-1498, Karaj - Iran

چکیده [English]

Nowadays, to mitigate global warming, soil can play a significant role as a pool of terrestrial carbon. Therefore, the objective of the study was to investigate the effect of climate on the radiocarbon Mean Resistance Time (MRT) in surface and subsurface soils in some of rangelands of Khuzestan Province, Iran. This way, rangelands were selected under different climates in two regions called Izeh and Ramhormoz. In both regions, the control profiles were studied to determine physical and chemical properties of the soil, carbon forms and 14C (carbon-14 isotopic ratio). The results showed that the MRT of the corresponding depths of Ramhormoz profile (with lower mean annual rainfall) was far higher than those of the Izeh profile, due to higher turnover of fresh organic matters in Izeh rangeland. Unlike Izeh profile, the MRT in Ramhormoz profile did not increase with depth owing to clay content and topographic position of the region i.e. being a depositional site. Overall, the age of carbon-14 in the top horizons of the study areas was mostly affected by factors such as climate, land management and the presence of decomposition sensitive forms of carbon. While, in deep soil the age of carbon was affected by other factors, especially soil taxa, clay content, topographic position (erosional or depositional sites) and discontinuity in soil parameters such as bulk density than by climate.

کلیدواژه‌ها [English]

  • δ14C
  • Mean Resistance Time
  • Carbon Forms
  • Climate
  • Khozestan

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