با همکاری انجمن مهندسان مکانیک ایران

نوع مقاله : مقاله پژوهشی لاتین

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه مکانیک بیوسیستم، دانشکده کشاورزی، دانشگاه بوعلی سینا، همدان، ایران

2 گروه مکانیک بیوسیستم، دانشکده کشاورزی، دانشگاه بوعلی سینا، همدان، ایران

3 گروه زراعت و اصلاح نباتات، دانشکده کشاورزی، دانشگاه بوعلی سینا، همدان، ایران

چکیده

شاخص پوشش گیاهی سبز کسری (FVC) و شاخص نرمال شده تفاضل پوشش گیاهی (NDVI) از شاخص بسیار مهم سبزینگی می‌باشند و ارتباط بسیار قوی با زیست‌توده سبز دارند. هدف اصلی این پژوهش، ارزیابی شاخص NDVI حاصل از حسگر دستیGreesnseeker (GS)  در تخمین مقدار زیست‌توده، کلروفیل و شاخص FVC در گیاه اسفناج می‌باشد. در این پژوهش برای جداسازی مناسب زمینه خاک از گیاه از شاخص‌های رنگی G-B و ExG استفاده شد. در طول دوره رشد 28 تا 44 روز بعد از جوانه‌زنی گیاه، نتایج تحقیق نشان داد که NDVI حاصل از GS ارتباط خوبی با کلروفیل داشته (R = 0.61 to 0.91) و ارتباط بین این شاخص با زیست‌توده نیز معنی‌دار بود. علاوه بر این، نتایج نشان داد که در این دوره رشد ارتباط خوبی بین شاخص NDVI حاصل از GS با شاخص FVC وجود دارد ((R = 0.67 to 0.82. در حسگر در ارزیابی تاثیر نرخ نیتروژن بر شاخص NDVI، مشخص شد که تنها در دوره کوتاه 28 تا 36 روز پس از جوانه‌زنی ارتباط خطی معنی‌داری بین این دو متغیر وجود دارد. نتایج نشان داد که حسگر Greenseedke توانایی خوبی در تخمین کلروفیل و مقدار زیست‌توده گیاه دارد و از آن می‌توان در میانه رشد گیاه، مقدار شاخص پوشش گیاهی سبز کسری را به‌خوبی برآورد کرد.

کلیدواژه‌ها

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