ذخیره کربن آلی و غیر آلی خاک‌های منطقه نیمه‌خشک ساردوئیه در جنوب کرمان

آب و خاک

مقاله 3، دوره 35، شماره 1 - شماره پیاپی 75، فروردین و اردیبهشت 1400، صفحه 33-48   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jsw.v35i1.82133

نویسندگان

حمیدرضا رفیعی¹؛ اعظم جعفری^{* 1}؛ احمد حیدری²؛ محمد هادی فرپور³؛ احمد عباس‌نژاد⁴

¹گروه علوم خاک، دانشکده کشاورزی، دانشگاه شهید باهنر کرمان

²گروه علوم و مهندسی خاک، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران

³دانشگاه شهید باهنر کرمان

⁴گروه زمین‌شناسی، دانشکده علوم، دانشگاه شهیدباهنر کرمان

چکیده

کربن خاک که شامل کربن آلی و کربن غیر آلی می­باشد، به دلیل تأثیر مهم آن بر گرمایش جهانی مورد توجه زیادی قرار گرفته است. علی­رغم اهمیت کربن موجود در خاک­های مناطق خشک و نیمه­خشک در چرخه جهانی کربن، تحقیق در مورد ذخایر کربن در مقیاس خاکرخ در خاک­های این مناطق به اندازه کافی انجام نشده است. در این مطالعه، توزیع عمودی و ذخیره کربن آلی، کربن غیر آلی و کربن کل در خاکرخ­های خاک منطقه ساردوئیه (جنوب کرمان) واقع در اقلیم نیمه­خشک مورد بررسی قرار گرفت. نتایج نشان داد که مقدار کربن آلی خاک در افق­های سطحی خاک بیشتر است و با افزایش عمق کاهش می­یابد. در حالی که کربن غیر آلی خاک در افق­های سطحی خاک حداقل است و در افق­های زیرسطحی افزایش می­یابد. ذخیره کربن آلی خاک بین 52/5 تا  kg m^-2 48/9 و ذخیره کربن غیر آلی در خاکرخ­های خاک بین 41/14 تا kg m^-2  34/91 می­باشد. سهم ذخیره کربن غیر آلی خاک از کربن کل خاک به­طور متوسط 5/77 درصد است و حدود 89 درصد آن در افق­های زیرسطحی (زیر 25 سانتی­متر) ذخیره شده است. میانگین سهم ذخیره کربن آلی خاک از کربن کل خاک نیز 4/22 درصد می­باشد. همچنین، نسبت ذخیره کربن غیر آلی به کربن آلی در خاکرخ‌های منطقه مورد مطالعه به طور متوسط 27/4 می­باشد.

کلیدواژه‌ها

تغییرات اقلیمی؛ توزیع عمقی کربن؛ کربن کل خاک؛ گرمایش جهانی

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