ارزیابی مدل AquaCrop در شبیه‌سازی عملکرد ذرت علوفه‌ای در طول جویچه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 پردیس کشاورزی و منابع طبیعی دانشگاه تهران

2 عضو هیئت علمی گروه مهندسی آبیاری و آبادانی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران

چکیده

مدل‌های رشد و نمو گیاهان زراعی ازجمله مدل AquaCrop از ابزارهای بسیار مهم برای تصمیم‌گیری و پیش‌بینی عملکرد گیاهان هستند. هدف این تحقیق، ارزیابی مدل AquaCrop در شبیه‌سازی عملکرد بیوماس و بلال ذرت علوفه‌ای در طول جویچه بود. چهار تیمار بر اساس تأمین نیاز آبی گیاه در انتهای جویچه (به ترتیب تیمارهای آبیاری کامل، در حد 75، 50 و 25 درصد آبیاری در انتهای جویچه) برای واسنجی و صحت‌سنجی مدل (تیمار آبیاری کامل برای واسنجی و تیمارهای کم‌آبیاری برای صحت‌سنجی) موردبررسی قرار گرفت. تیمار آبیاری کامل کمترین ضریب تغییرات عملکرد بیوماس و بلال ذرت علوفه‌ای مشاهده‌شده (به ترتیب 9 و 1/12 درصد) و شبیه‌سازی‌شده (به ترتیب 5/6 و 8/6 درصد) را داشت. شاخص‌های RMSE و NRMSE برای تخمین عملکرد بیوماس توسط مدل به ترتیب 6/1 تن بر هکتار و 1/10 درصد در مرحله واسنجی و 5/1 تن بر هکتار و 9/11 درصد در مرحله صحت‌سنجی به دست آمد. نتایج این تحقیق نشان داد که می‌توان از مدل AquaCrop برای شبیه‌سازی عملکرد بیوماس ذرت علوفه‌ای در طول جویچه استفاده نمود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Assessment of AquaCrop model for simulating forage maize yield along the furrow

نویسندگان [English]

  • Ibrahim Vatankhah 1
  • Hamed Ibrahimian 2
1
2
چکیده [English]

The growth and development of crop models such as AquaCrop model is the most important tools for decision-making and predicting crop yields. The aim of this research was to assess AquaCrop model for simulating spatial variability of forage maize yield along the furrow. Four treatments for calibration and validation of the model were investigated based on the percentage of supplied crop water requirement at the end of furrow (100, 75, 50 and 25 percent of full irrigation at the end of furrow). Full irrigation and deficit irrigation treatments were considered for model calibration and validation, respectively.  The full irrigation treatment had the lowest coefficient of variation for observed forage maize biomass and crop yield (9.0 and 12.1 %, respectively) and simulated forage maize biomass and crop yield (6.5 and 6.8 % respectively). Indicators of RMSE and NRMSE for simulation of maize biomass were 1.6 ton/ha and 10.1 % in the calibration stage and 1.5 ton/ha and 11.9 % in the validation stage, respectively. The results of this study indicated that the AquaCrop model can be applied for simulation of forage maize biomass along the furrow.

کلیدواژه‌ها [English]

  • Deficit irrigation
  • Furrow Irrigation
  • simulation
  • Uniformity

مراجع

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تحقیقات آب و خاک ایران
دوره 47، شماره 3
آبان 1395
صفحه 495-504

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