تحلیل حساسیت پارامترهای رشد گیاه ریحان در مدل AquaCrop تحت تنش‌های مختلف کود نیتروژن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی آب، دانشکده کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران

2 هیات علمی، گروه مهندسی آب، دانشکده کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران

3 هیات علمی، گروه باغبانی، دانشکده کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران

چکیده

پارامترهای به‌کار رفته در مدل­های شبیه­ساز تحت شرایط مختلف مدیریتی و زیست‌محیطی مقادیر متفاوتی به خود اختصاص می­دهند. تحلیل حساسیت به عنوان یک رویکرد مؤثر برای تشخیص اثرگذارترین پارامترها در روند مدل­سازی و بررسی عدم قطعیت خروجی مدل­ها شناخته شده است. در این پژوهش حساسیت پارامترهای رشد مدل AquaCrop برای گیاه ریحان تحت تنش­های مختلف کود نیتروژن مورد ارزیابی قرار گرفت. بدین منظور آزمایشی در گلخانه تحقیقاتی پردیس کشاورزی و منابع طبیعی دانشگاه تهران واقع در کرج انجام شد. پارامترهای رشد به کار ­رفته در مدل AquaCrop شامل بهره­وری آب نرمال­شده (*WP)، پوشش گیاهی اولیه (CC0)، حداکثر ضریب تعرق گیاهی ()، ضریب رشد پوشش گیاهی (CGC) و ضریب کاهش پوشش گیاهی (CDC) با استفاده از روش Beven (1979) تحلیل حساسیت شدند. نتایج نشان داد، بیشترین حساسیت خروجی مدل AquaCrop، نسبت به تغییر پارامتر *WP است. در نتیجه لازم است برای افزایش دقت و عملکرد مدل، این پارامتر برای شرایط محیطی و نوع محصول واسنجی شود. هم­چنین، مقایسه ضرایب حساسیت به دست آمده برای هر یک از پارامترهای رشد نشان داد با افزایش درجه تنش کود نیتروژن، حساسیت مدل نیز افزایش یافته است. اما نرخ افزایش یکسانی بین پارامترهای رشد مشاهده نشد. به عبارت دیگر، تأثیرپذیری پارامترها از کمبود کود نیتروژن متفاوت بود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Sensitivity Analysis of Basil Crop Growth Parameters in the Aquacrop Model under Different Nitrogen Fertilizer Stresses

نویسندگان [English]

  • Hadisseh Rahimikhoob 1
  • Teymour Sohrabi 2
  • Mojtaba Delshad 3
1 Department of Irrigation & Reclamation Engineering Faculty of Agriculture Engineering &Technology College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran.
2 Professor, Irrigation and Reclamation Engineering Department, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran.
3 Associate Professor, Horticultural Sciences Department, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
چکیده [English]

Crop model parameters are influenced by different management and environmental conditions. Sensitivity analysis is recognized as an effective approach for identifying the most influential parameters in the modelling process and output uncertainty assessment. In present study, the sensitivity of AquaCrop model parameters for basil was evaluated under different nitrogen fertilizer stresses. For this purpose, an experiment was conducted in the research greenhouse of the College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran. Crop growth parameters used for sensitivity analysis include normalized water productivity (Wp < sup>*), initial canopy cover (CC0), maximum transpiration coefficient (), canopy growth coefficient (CGC) and canopy decline coefficient (CDC) which analyzed by Beven (1979) approach. The results showed that the highest sensitivity of the AquaCrop model was due to the change in the Wp < sup>* parameter. Therefore, it is necessary to calibrate this parameter under different environmental conditions and for diverse crop species to increase the accuracy and performance of the model. Also, comparison of the sensitivity coefficients obtained for each of the growth parameters showed that by increasing nitrogen fertilizer stress, the model sensitivity also increased. But the growth rate was not the same among the selected parameters. In other words, the impressibility of parameters was different from nitrogen deficiency.

کلیدواژه‌ها [English]

  • Sensitivity analysis
  • AquaCrop model
  • Crop growth parameters
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