برآورد دماهای کاردینال و زمان حرارتی مورد نیاز برای جوانه‏زنی بذر اویارسلام بذری (Cyperus difformis)

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه گرگان

چکیده

هدف از این تحقیق کمی‏سازی پاسخ سرعت جوانه‏زنی علف‏هرز اویارسلام بذری (Cyperus difformis L.) به دما، برآورد دماهای کاردینال و زمان حرارتی مورد نیاز برای درصدهای مختلف جوانه‏زنی بود. چهار مدل رگرسیونی غیرخطی ]دندان مانند، دوتکه‏ای، بتا (4پارامتره و 5 پارامتره)[ در هفت دمای ثابت (از 15 تا 45 با فواصل 5 درجه سانتی‏گراد) برای توصیف پاسخ دمایی سرعت جوانه‏زنی اویارسلام بذری مورد ارزیابی قرار گرفت. شاخص‏های مختلف آماری (ریشه میانگین مربعات خطا (RMSE) و شاخص آکائیک (AICc)) برای مقایسه مدل‏ها به کار رفت. پارامترهای برآورد شده با استفاده از مدل دندان مانند از اطمینان بیشتری نسبت به سایر مدل‏ها برخوردار بود (RMSE=0.0009, AICc=-380.8). دماهای پایه، بهینه زیرین، بهینه زبرین و بیشینه اویارسلام بذری به ترتیب 73/14، 34/34، 54/38 و 01/45 درجه سانتی‏گراد برآورد شد. بر اساس مدل دندان مانند زمان حرارتی مورد نیاز برای 50 و 95 درصد جوانه‏زنی به ترتیب معادل 50/43 و 01/65 درجه- روز بود. دماهای کاردینال به مدل‏های مورد ارزیابی بستگی داشت. به‏طور کلی مدل دندان مانند نسبت به سایر مدل‏ها برآورد بهتری از دماهای کاردینال اویارسلام بذری داشت.

کلیدواژه‌ها

عنوان مقاله [English]

Estimation of Cardinal Temperatures and Thermal Time Requirement for Cyperus difformis Seed Germination

نویسندگان [English]

  • Abolfazl Derakhshan
  • javid gherekhloo
  • efat paravar
چکیده [English]

The aim of this study was to quantify the response of germination rate to temperature and to find cardinal temperatures and thermal time required for different germination percentiles in Cyperus difformis. We compared 4 non-linear regression models [dent-like, segmented and beta (4 and 5 parameter)] to describe the germination rate-temperature relationships of C. difformis over seven constant temperatures (ranging from 15 to 45 ˚C, with 5 ˚C intervals). Different statistical indices [Root Mean of Squares of Error (RMSE), Akaike Information Criterion (AICc)] were used to compare models performances. The dent-like model was found to be the best model to predict germination rate (RMSE=0.0009, AICc=-380.8). The base, the lower optimum, the upper optimum and the maximum temperatures for the germination of C. difformis were estimated to be 14.73, 34.34, 38.54 and 45.01˚C, respectively. The thermal time required to reach 50 and 95% germination was 43.50 and 65.01 degree-days, respectively. The cardinal temperatures depended on the model used for their estimation. Overall, the dent-like model was better suited than the other models to estimate the cardinal temperatures for the germination of C. difformis.

کلیدواژه‌ها [English]

  • Base temperature
  • ceiling response
  • modeling
  • optimum temperature
  • temperature response

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