بررسی ضرایب ورودی گیاهی مدل WOFOST در شرایط کم آبیاری بخشی ریشه برای گیاه آفتابگردان

نوع مقاله : مقالات پژوهشی

نویسندگان

1 ساری

2 علوم کشاورزی و منابع طبیعی ساری

3 ٍٍٍساری

4 همدان

5 آزاد لاهیجان

چکیده

پژوهش هایی که تاکنون در پیوند با مدل WOFOST منتشر شده است، به روش های سنتی کم آبیاری معطوف بوده که یا به صورت درصد کم آبیاری در شرایط بهینه لحاظ می شده یا بر اساس بررسی شرایط رشد در روزهای معینی پس از آبیاری است. همچنین بررسی این پژوهش ها نشان می دهد با وجودی که گیاهان یکساله زیادی مبنای بررسی ها بوده اند، اما هیچ کدام شامل گیاه آفتابگردان نبوده است. لذا در این پژوهش توانایی آخرین نسخه مدل WOFOST در شبیه سازی واکنش آفتابگردان در شرایط کم آبیاری بخشی ریشه و خشکی ریشه در دو سطح 55 و 75 درصد در مقایسه با شرایط آبیاری کامل مورد بررسی قرار گرفت تا بتوان ضرایب گیاهی را برای هر تیمار محاسبه کرد. ضریب های به دست آمده مبنایی برای محاسبات میزان بهره وری مصرف آب در مزرعه پژوهشی دانشگاه کشاورزی و منابع طبیعی ساری می باشد. نتایج حاصل از واسنجی نشان داد که ضرایب گیاهی وابسته به شرایط آب و هوایی، طول و عرض جغرافیایی منطقه و خصوصیات فنولوژیکی و فیزیولوژیکی گیاه برای یک گیاه خاص در طول شبیه سازی ثابت مانده و ضرایب آبیاری وابسته به نوع تیمارهای آبیاری و رفتار آنها در طول دوره رشد توانایی تغییر دارند. همچنین نتایج نشان داد که با کاهش حجم آب داده شده به گیاه، ضریب بیشینه آهنگ جذب دی اکسیدکربن در برگ و ضریب خاموشی کاهش و برعکس ضریب کارایی مصرف نور افزایش یافت. همچنین ارزیابی تمامی پارامترهای مورد بررسی بین مقادیر شبیه سازی و مشاهده ای نشان می دهد که شاخص ریشه میانگین مربعات خطای نسبی (nRSME) عملکرد دانه و زیست توده کل در هر دو رقم مورد بررسی کمتر از 10 درصد، شاخص ضریب جرم باقی مانده‌ها (CRM) نزدیک به صفر، ضریب کارآیی مدل (EF) 89/0، ضریب همبستگی (R)96/0 بدست آمد و مدل به خوبی توانسته است با استفاده از ضرایب واسنجی شده، پاسخ گیاه آفتابگردان را در تیمارهای کم آبیاری شبیه سازی کند.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of Plant Input Coefficient of WOFOST in PRD Condition for Sunflower

نویسندگان [English]

  • ,fatmeh hashami 1
  • Ali Shahnazari 2
  • Mahmoud raeini 3
  • Ali Ghadami 4
  • Ebrahim Amiri 5
1 Sanru
2 Sanru
3 sanru
4 Sanru
5 Azad
چکیده [English]

The research as reported in related to simulation by WOFOST, predominately focused on traditional methods of deficit irrigation such as terms of percentage in full irrigation conditions or as evaluation of growth and development in certain days after irrigation. Also it should be noted that not only these researches was based on a year plants, but also there isn’t any research of sunflower. So, in this research the ability of the last version of WOFOST in simulating of sunflower in DI and PRD in %75 and %55 levels is carried out in contrast to FI in two continued year so that crop coefficient of sunflower could be calculated and by this, the productivity of yield in Sari agricultural and natural resources research field could be achieved. The results of calibrations showed that crop coefficient which depends on weather, coordinates of region and physiologic and phonologic of plant is fixed among the simulation and irrigation coefficient are depend on irrigation treatment and their response in development of growth stages. Also the results showed that by decreasing the volume of water which given to plant, AMAXTB and KDIFTB decreased and adversely EFFTB is increase. Simulated seed yield and total biomass had normalized root mean square error (nRMSE) index less than 10%, coefficient of residual mass (CRM) index near zero, modeling efficiency (EF) about 0.98, correlation coefficient (R) about 0.96 and totally comparing the simulation and observation parameters showed that in the most statistical test done in the present study, the result in acceptable range which represented that WOFOST could be able to simulate the responses od sunflower in DI and PRD treatments by calibrated coefficient.

کلیدواژه‌ها [English]

  • Sunflower
  • WOFOST
  • PRD
  • Biomass
  • yield
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