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ارزیابی کارایی دو مدل کربن خاک با استفاده از داده های اندازه گیری شده در مراتع نیمه خشک باجگاه، استان فارس | ||
تحقیقات آب و خاک ایران | ||
مقاله 5، دوره 50، شماره 4، شهریور 1398، صفحه 819-835 اصل مقاله (902.21 K) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2018.264873.668001 | ||
نویسندگان | ||
بیژن آزاد* ؛ سید فخرالدین افضلی | ||
بخش مهندسی منابع طبیعی و محیط زیست دانشگاه شیراز | ||
چکیده | ||
خاک مراتع ذخیرهگاه مهم جهانی کربن بوده و هرگونه تغییر در این ذخیرهگاه تأثیر زیادی بر انتشار دیاکسیدکربن به اتمسفر و گرمایش جهانی دارد. ظرفیت این ذخیرهگاه به وسیله روابط متقابل پیچیده بین عوامل متنوعی مانند اقلیم، خصوصیات خاک، نوع پوششگیاهی و اقدامات مدیریتی کنترل میشود. مدلهای کربن برای فهمیدن اثر این فاکتورها بر کربن خاک در بلندمدت نقش مهمی دارند. مدلهای کربن باید به طور صحیح در منطقه اعتبارسنجی شده، سپس میتوانند برای شبیهسازی و پیشبینی کربن خاک استفاده شوند. هدف اصلی این مطالعه ارزیابی کارایی مدلهای RothC و Century برای مراتع نیمهخشک باجگاه استان فارس به عنوان پراستفادهترین مدلها در مطالعات کربن خاک بود. ریشه میانگین مربعات خطا (RMSE)، میانگین مطلق خطا (MAE)، تفاوت میانگین (MD)، ضریب تبیین (R2)، r (ضریب همبستگی) و آزمون t_student بین مقادیر شبیهسازی شده و اندازهگیری شده برای ارزیابی کارایی مدلهای RothC و Century استفاده شد. نتایج نشان داد هرچند مدل Century کربن آلی خاک را به مقدار ناچیزی کمتر از مدل RothC شبیهسازی نموده اما بر مبنای آنالیزهای آماری هر دو مدل نتایج رضایتبخشی ارائه دادند و مقادیر شبیهسازی شده به خوبی با مقایر اندازهگیری شده همخوانی داشتند. همچنین نتایج شبیهسازیها به وسیله مدلهای Century و RothC نشان داد در طی سالهای 1366 هجری شمسی (1987 میلادی) تا 1429 هجری شمسی (2050 میلادی) ذخایر کربن خاک به ترتیب به میزان 92/7 و 92/12 درصد افزایش خواهد یافت. | ||
کلیدواژهها | ||
ترسیب کربن خاک؛ ذخیرهگاه کربن خاک؛ گرمایشجهانی؛ مدل کربن؛ مراتع نیمهخشک | ||
مراجع | ||
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