شبیه‌سازی و ارزیابی مدل AquaCrop در مدیریت کم‌آبیاری گندم زمستانه در منطقه زنجان

نویسندگان

1 دانش‌آموخته آبیاری و زهکشی دانشگاه زنجان

2 دانشیار گروه مهندسی آب دانشگاه زنجان

چکیده

کاهش تدریجی منابع آب، لزوم مدیریت مناسب آبیاری و اعمال کم‌آبیاری را ایجاب می‌کند. آزمایش‌های صحرایی برای تحلیل مدیریت‌های مختلف کم‌آبیاری، باشرایط فیزیکی محل آزمایش، تعداد سناریوها ونیز هزینه‌های بالای انجام آزمایش محدود می‌گردند. برای غلبه بر این محدودیت‌ها، می‌توان از مدل‌های گیاهی به عنوان ابزاری توانمند برای شبیه‌سازی آزمایش‌های صحرایی استفاده کرد. در این پژوهش مدل AquaCrop در کم‌آبیاری گیاه گندم در منطقه زنجان ارزیابی شد. آزمایش مزرعه‌ای به منظور بررسی واکنش گیاه گندم به تیمارهای مختلف کم‌آبیاری به صورت طرح آماری کرت‌های خرد شده در قالب بلوک‌های کامل تصادفی و در سه تکرار انجام گرفته بود. تیمارهای آبیاری شامل تأمین 100، 80 و 60 درصد نیاز آبی گیاه بود. مدل با داده‌های تکرار اول مقادیر واقعی واسنجی گردید. سپس با وارد کردن شاخص برداشت تکرارهای دوم و سوم کلیه تیمارهای آبیاری، عملکرد و بهره‌وری مصرف آب گیاه گندم برای آن‌ها شبیه‌سازی و پیش‌بینی شد. بر اساس نتایج، بیش‌ترین اختلاف بین مقادیر شبیه‌سازی شده و مقادیر واقعی عملکرد و بهره‌وری مصرف آب به میزان 9/6 و 0/7 درصد (به ترتیب) در تیمار 80 درصد نیاز آبی و در تکرار سوم حاصل شد و کم‌ترین اختلاف به میزان 0/1 و 5/0 درصد (به ترتیب) در تیمار 60 درصد و 80 درصد تکرار دوم (به ترتیب) به دست آمد. مقدار R2 مقادیر شبیه‌سازی شده و مقادیر واقعی عملکرد و بهره‌وری مصرف آب 96/0 و 99/0 (به ترتیب) حاصل شد که نشان از کارایی خوب مدل در شبیه‌سازی و پیش‌بینی مقادیر عملکرد و بهره‌وری مصرف آب گیاه گندم در شرایط کم‌آبیاری بود.

کلیدواژه‌ها

عنوان مقاله [English]

Simulation and Assessment of AquaCrop Model in deficit irrigation management of Winter Wheat in Zanjan Region

نویسندگان [English]

  • Zahra Aghajanloo 1
  • Jaefar Nikbakht 2
1 Graduate Student of Irrigation and Drainage, University of Zanjan
2 Assist. Prof., Dept. of Water Engineering, University of Zanjan
چکیده [English]

Gradual decline in water resources require suitable management of irrigation water and applying of deficit irrigation.Field tests to analysis of different states of deficit irrigation are constrained due to restriction of the experiment reliability to the physical conditions of the test place and limited number of the testing scenario in field and the high cost of testing.To overcome these limitations, crop models can be used as a powerful tool to simulate field tests.In this research, AquaCrop model was evaluated in deficit irrigation of winter wheat in Zanajn Region.The study data was collected from filed test values which was done in Research Farm of University of Zanjan at2010-2011.The filed test was carried out to assess reaction of winter wheat to deficit irrigation treatments.The test was done as split plot design on the base of complete randomized block.Irrigation treatments were done as supplying of100%,80%and60%of crop water requirement.The first replication data was used for model calibrating.By entering harvest index data of the second and third replications data of irrigation treatment to model.their yield and water use efficiency were simulated.On the result, the highest difference between simulated and recorded data of yield and water use efficiency were as6.9%and7.0%(respectively)at the third replication of 80%crop water requirement treatment.The least difference were as1.0%and0.5%(respectively)at the second replication of60%and80%crop water requirement treatment(respectively).R2of simulated and real data was calculated0.96for yield and0.99for water use efficiency.High value ofR2data was demonstrated suitable performance of AquaCrop model in simulation and forecasting of yield and water use efficiency of winter wheat in deficit irrigation condition.

کلیدواژه‌ها [English]

  • AquaCrop Model
  • Crop yield
  • Deficit irrigation
  • water use efficiency
  • winter wheat

مراجع

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دانش آب و خاک
دوره 33، شماره 2
تیر 1402
صفحه 23-34

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