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فرشید رمضانی عباس کاویانی هادی رمضانی اعتدالی

چکیده

مدل AquaCrop برای شبیه¬سازی واکنش محصولات زراعی به مقدار آب مصرفی و مدیریت آبیاری توسعه یافت. سادگی، نیاز به حداقل داده ورودی و دقت قابل قبول مدل از مزایای استفاده گسترده از آن می‌باشد. در این تحقیق به منظور واسنجی و اعتبار‌سنجی عملکرد از داده‌های مزرعه‌ای تحت کشت یونجه در اردستان استفاده شد. اطلاعات هواشناسی از ایستگاه سینوپتیک اردستان، کیفیت آب و خاک از نتایج آنالیز آب و خاک مزرعه و تبخیر-تعرق گیاه مرجع به روش فائو-پنمن مانتیث محاسبه شد. پوشش گیاهی اولیه، پوشش گیاهی بیشینه، عمق توسعه ریشه اولیه، عمق توسعه ریشه بیشینه، ضریب گیاهی، تاریخ‌های جوانه‌زنی، گل‌دهی، حداکثر پوشش گیاهی، شروع پیری پوشش گیاهی و رسیدگی فیزیولوژیک پارامترهای واسنجی شده مدل طی شش سال 2010 تا 2015 بودند. از اطلاعات 2 مزرعه برای واسنجی و 2 مزرعه دیگر برای اعتبار‌سنجی استفاده شد. سپس، عملکرد یونجه طی سال‌های مذکور مورد اعتبارسنجی قرار گرفت. شاخص‌های ارزیابی مزرعه‌ای شامل ضریب تبیین (R2)، مجذور میانگین مربعات خطای نرمال شده(NRMSE) ، ضریب باقیمانده (CRM)، و کارایی مدل‌سازی (EF) برای اعتبارسنجی استفاده شدند. CRM مثبت در اغلب نتایج نشان از کم برآورد بودن مدل بود. بیشینهR2 برابر یک و NRMSE، 04/0 نشان از دقت بالای مدل در شبیه‌سازی عملکرد بود. تبخیر از سطح خاک، تعرق گیاه و تبخیر-تعرق واقعی به وسیله مدل برآورد گردید. مقدار تبخیر طی مدت برداشت محصول 27 تا 47 درصد تبخیر-تعرق بود. مقدار بهره‌وری آب مبتنی بر تبخیر-تعرق (Y ET-1) 27 تا 44 کمتر از بهره‌وری مبتنی بر تعرق (Y T-1) شده است. AquaCropمدل گیاهی قدرتمند و با ارزشی برای بهبود مدیریت آب در مزرعه و محاسبه بهره‌وری آب می‌باشد.

جزئیات مقاله

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ارجاع به مقاله
رمضانی ف., کاویانی ع., & رمضانی اعتدالی ه. (2017). ارزیابی مدل AquaCrop در برداشت‌های مختلف گیاه یونجه در اردستان. آب و خاک, 31(3), 738-753. https://doi.org/10.22067/jsw.v31i3.60933
نوع مقاله
علمی - پژوهشی