تعیین الگوی مکانی و رقابت بین‌گونه‌ای توده آمیخته سرخدار در جنگل‌های افراتخته علی‌آبادکتول

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مدیریت جنگل، دانشکده منابع طبیعی، دانشگاه تربیت مدرس، نور، مازندران، ایران. ‏

2 دانشیار، گروه علوم و مهندسی جنگل، دانشکده منابع طبیعی، دانشگاه تربیت مدرس، نور، مازندران، ایران. ‏

چکیده

الگوی پراکنش و نحوه اجتماع­پذیری درختان گونه­های مختلف ارتباط مستقیمی با پویایی و روابط بین گونه­ای درختان در بوم­سازگا­ن­های طبیعی جنگل دارد. هدف از این پژوهش، تعیین الگوی مکانی درختان سرخدار، ممرز و لور و همچنین تحلیل رقابت بین درختان سرخدار با دو گونه دیگر در ذخیره­گاه سرخدار افراتخته شهرستان علی­آباد کتول بود. پس از جنگل­گردشی، توده مورد نظر انتخاب شده و موقعیت مکانی گونه­ها با استفاده از دستگاه فاصله­یاب لیزری، TP360 به روش فاصله و آزیموت ثبت شد. در مجموع 366 پایه سرخدار، 47 پایه ممرز و 71 پایه لور مورد اندازه­گیری قرار گرفت. نتایج تابع تک متغیره همبستگی جفتی نشان داد که پراکنش مکانی سه گونه از الگوی تصادفی پیروی می­کند. بررسی رقابت بین گونه­ها با استفاده از تابع دومتغیره همبستگی جفتی نشان داد که بین درختان سرخدار با درختان ممرز و لور رقابتی وجود نداشته یا بسیار کم است. میانسال­بودن توده و رسیدن به مرحله بلوغ  از عوامل مهم شکل­گیری الگوی تصادفی برای سه گونه سرخدار، ممرز و لور است. سرشت نوری درختان جنگلی، وجود تغذیه متفاوت درختان گونه­های مختلف و رشد درختان در عرصه­های پرشیب و کم­شیب با بسترهای مختلف خاکی هم می­تواند دلیلی بر نبود رقابت منفی بین گونه­ها باشد. بنابراین برای احیاء این گونه باارزش باید تلاش شود که سرخدار در عرصه­های کم­شیب و با عمق زیاد خاک استقرار پیدا کند.

کلیدواژه‌ها


عنوان مقاله [English]

Determination of spatial pattern and Interspecific competition in mixed yew stand in ‎Afratakhteh Forest of Aliabad

نویسندگان [English]

  • Aref Hesabi 1
  • Seyed Jalil Alavi 2
  • Omid Esmailzadeh 2
1 MSc Student of Forest Management, Department of Forest Science, Faculty of Natural Resources, Tarbiat ‎Modares University, Nur, Mazandaran, I. R. Iran. ‎
2 Associate Professor, Department of Forest Science, Faculty of Natural Resources, Tarbiat Modares ‎University, Nur, Mazandaran, I. R. Iran. ‎
چکیده [English]

The distribution pattern and the association of trees of different species have a direct correlation with the dynamics and tree species relationships in the forest ecosystems. The purpose of the present Research was to determine the spatial pattern of Yew, Hornbeam and Oriental Hornbeam trees and also to analyze the competition between Yew trees with two other species in Afratakhteh yew reserve of Aliabad katul city. After forest surveying, intended stand selected and the location of the species was recorded using the TP360 Laser Rangefinder machine by distance and azimuth method. Overall, of 366 yews, 47 hornbeams and 71 Oriental Hornbeams were measured. The results of Single variable pair correlation function showed that spatial distribution of three species follows a random pattern. Investigating the competition between species using a bivariate pair correlation function showed that there was no or a little difference between yew trees with hornbeam and Oriental Hornbeams competition. Middle aged stand, Intra-specific competition and reaching the stage of puberty are important factors for the formation of a random pattern for three species of Yew, Hornbeam and Oriental Hornbeam. The optical nature of forest trees, the existence of different nutrition of different species trees and the growth of trees in steep and sloping arenas with different soil beds can be a reason for the absence of negative competition between species. Therefore, in order to revive this valuable species, must be tried the yew will be established in low-slope areas with great soil depth‎.

کلیدواژه‌ها [English]

  • Association
  • Distribution
  • hornbeam
  • Oriental Hornbeam
  • Pair correlation function g (r)‎.‎
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