تاثیر رقابت درون‌گونه‌ای بر رویش قطری و بیومتری تراکئیدها: مطالعه درختان غالب و مغلوب نوئل در یک مزرعه دست‌کاشت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، گروه علوم و صنایع چوب و کاغذ، دانشگاه تهران

2 گروه علوم و صنایع چوب و کاغذ دانشکده منابع طبیعی دانشگاه تهران

3 استاد گروه علوم و صنایع چوب و کاغذ دانشکده منابع طبیعی دانشگاه تهران

4 دانشجوی دکتری گروه علوم و صنایع چوب و کاغذ دانشکده منابع طبیعی دانشگاه تهران

10.22034/ijwp.2023.2000787.1610

چکیده

هدف این پژوهش بررسی تاثیر رقابت درون گونه‌ای بر رشد عرضی و بیومتری الیاف در درختان غالب و مغلوب رشد یافته در یک مزرعه‌ء دست کاشت نوئل است. در این مزرعه، کاشت بعدی نهال‌ها (سه سال بعد) در بین نهال‌های اولیه موجب ایجاد درختان غالب و شدیداً مغلوب شد. یافته‌ها نشان داد که درختان غالب، رشد عرضی بیشتری داشته و تراکئیدهایشان پهن‌تر و ضخیم‌ترند. علیرغم اینکه میانگین طول تراکئیدها در درختان مغلوب، اندکی بیشتر بود ولی این اختلاف از نظر آماری معنی‌دار نشد. موقعیت اجتماعی درخت، نه تنها بر میزان مطلق ویژگی‌های چوب تاثیرگذاشت بلکه روند تغییرات این ویژگی‌ها از مغز به پوست و همچنین نحوه ارتباط درونی این ویژگی‌ها را تحت تاثیر قرار داد. درمجموع می توان نتیجه گرفت که درختان مغلوب کیفیت چوب و الیاف بهتری از درختان غالب دارند ولی در عوض، نرخ رشد‌شان کم‌تر است. ایجاد رقابت بین درختی تنها در سال‌های اولیه رشد (جوان‌چوبی) برای بهبود کیفیت چوب توصیه می‌شود.

کلیدواژه‌ها

موضوعات


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