استخراج شاخص سطح برگ ذرت علوفه‌ای با استفاده از روش عکسبرداری رقومی نیم‌کروی (مطالعه موردی: مزارع قلعه‌نو، جنوب تهران)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری سنجش از دور، گروه سنجش از دور و GIS، دانشکده جغرافیا، دانشگاه تهران، تهران، ایران

2 گروه سنجش از دور و GIS، دانشگاه تهران، تهران ، ایران

3 دانشیار گروه سنجش از دور و GIS، دانشکده جغرافیا، دانشگاه تهران، تهران، ایران.

4 استادیار گروه آگرواکولوژی، موسسه تحقیقاتی علوم محیطی، دانشگاه شهید بهشتی، تهران، ایران

5 موسسه روش‌شناسی برای تحلیل‌های محیطی (CNR IMAA)، C.da S.Loja snc, 85050 Tito (Potenza)، ایتالیا

چکیده

هدف این تحقیق، ارزیابی کارآیی روش عکسبرداری رقومی نیم­کروی (DHP) در برآورد LAI در مزارع ذرت علوفه­ای جنوب تهران است. بدین منظور با در نظر گرفتن ماهیت تغییرپذیری مکانی-زمانی در مزارع کشاورزی و در طول یک فصل رشد، عکسبرداری DHP و نیز اندازه­گیری به ‌روش تخریبی به منظور مقایسه، برای برآورد LAI در مزارع ذرت علوفه­ای شهرستان قلعه‌نو واقع در جنوب تهران، در سال 1397 انجام گردید. نتایج نشان داد که مقادیر LAI استخراج شده از طریق DHP در دوره­های مختلف رشد گیاه، ارتباط خطی قوی با مقادیر اندازه‍گیری شده به روش تخریبی دارد (R2 = 0.92، RMSE= 0.45 و Bias = 0.31). هر چند، بازه LAI میانی (میزان LAI: 5< - 2) با میزان RMSE = 0.63 و Bias = 0.49، نسبت به دو بازه LAI

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Deriving the Leaf Area Index of Silage Maize Using Digital Hemispherical Photography Method (Case Study: Qaleh-Now Farms, South of Tehran)

نویسندگان [English]

  • Elahe Akbari 1
  • ali darvishi Boloorani 2
  • Najmeh Neysani Samany 3
  • Saeid Hamzeh 3
  • Saeid Soufizadeh 4
  • Stefano Pignatti 5
1 PhD student of Remote sensing, Department of Remote Sensing and GIS, Faculty of Geography, University of Tehran, Tehran, Iran.
2 Associate professor, Department of Remote sensing and GIS, Faculty of Geography, University of Tehran, Tehran, IRAN.
3 Associate professor, Department of Remote Sensing and GIS, Faculty of Geography, University of Tehran, Tehran, Iran
4 Assistant professor, Department of Agro-ecology, Environmental Sciences Research Institute, Shahid Beheshti University, G.C, Tehran, Iran
5 Institute of Methodologies for Environmental Analysis (CNR IMAA), C.da S.Loja snc, 85050 Tito (Potenza), Italy
چکیده [English]

The present study aimed to evaluate the efficiency of digital hemispherical photography (DHP) in deriving LAI in silage maize farms in the south of Tehran. For this purpose, the DHP as well as destructive measurements for comparison were used to estimate LAI in silage maize farms in Qaleh-Now County in the south of Tehran in 2018 considering the nature of spatio-temporal variability in agricultural fields during a growing season. The results showed LAI obtained through DHP at different periods of plant growth has a strong linear correlation with the values measured by the destructive method (R2 = 0.92, RMSE = 0.45 and Bias = 0.31). However, the intermediate LAI range (LAI: 2 -

کلیدواژه‌ها [English]

  • leaf area index
  • Digital Hemispherical Photography
  • Extinction coefficient
  • Silage maize
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