بررسی ساختار عمودی و اجتماعات مکانی گونة راش با استفاده از تابع O-ring در جنگل خیرود نوشهر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته مقطع دکتری-دانشگاه تهران

2 استاد- دانشکده منابع طبیعی-دانشگاه تهران

3 دانشیار-دانشکده منابع طبیعی دانشگاه تهران

4 استاد - دانشکده منابع طبیعی دانشگاه تهران

چکیده

هدف از مطالعه حاضر، بررسی الگوی مکانی و اجتماعات مکانی گونه راش در طبقات ارتفاعی در توده های دست نخورده راش میباشد. بدین منظور منطقه ای به مساحت 25 هکتار با تیپ راش در بخش گرازبن جنگل خیرود انتخاب گردید و کلیه پایه های راش با قطر برابر سینه بیشتر از 5/7 سانتی متر اندازه گیری شدند و قطر برابر سینه و موقعیت مکانی آنها ثبت شد. با استفاده از رابطه قطر و ارتفاع گونه راش در بخش گرازبن، ارتفاع درختان محاسبه گردید. سپس درختان به چهار طبقه ارتفاعی (ارتفاع کمتر از 15 متر (S)، 15 تا 25 متر (L)، 25 تا 35 متر (M)و بیشتر از 35 متر (U)) تقسیم و الگوی مکانی در هر یک از طبقات ارتفاعی با استفاده از تابع O-ring یک متغیره و اجتماعات مکانی میان طبقات ارتفاعی مختلف با استفاده از تابع دو متغیره O-ring آنالیز شد. نتایج تحلیل ها نشان داد الگوی مکانی راش در طبقه ارتفاعی (S)، کپه ای و در طبقه ارتفاعی (L)، تا فاصله 21 متر کپه ای و پس از آن تصادفی; در طبقه ارتفاعی (M) تا فاصله هشت متر الگوی کپه ای و پس از آن تصادفی;و در طبقه ارتفاعی U الگوی پراکنش گونه راش تصادفی می باشد. نتایج آنالیز دو متغیره O-ring نشان داد رابطه متقابل پایه های راش در طبقه ارتفاعی S با سایر طبقات ارتفاعی تا فاصله 30 تا 40 متری از نوع جذب می باشد. مطالعه حاضر کاربرد تابع O-ring را در بررسی ساختار عمودی اکوسیستم های جنگلی نشان می دهد.

کلیدواژه‌ها

عنوان مقاله [English]

Investigation on vertical structure and spatial associations of Fagus orientalis lipsky using O-ring function in Kheyrud forest, Nowshahr

نویسنده [English]

  • Zahra Nouri 1
1 PhD graduated-University of Tehran
چکیده [English]

This study aims at analyzing spatial pattern and associations of Fagus oriantalis Lipsky in different vertical classes in intact beech forests. Data collection was done in 25 ha plot in Gorazbon district of Educational and Experimental Forests of University of Tehran. Species and DBH of all trees with DBH > 7.5 cm were recorded. The location of each tree was determined using azimuth and distance method in order to map the tree positions. Height of trees was calculated using diameter – height model developed for Gorazbon district. Trees were then divided in 4 Height classes: 25 m (U). Univariate O-ring statistic was used to analyze the spatial patterns of Fagus orientalis at different tree height classes, and the bivariate O-ring statistic was used to analyze interspecies spatial associations among these height classes. Programita software was used for all analysis. Results showed spatial pattern of Fagus orientalis in height class (S) was clustered. In height class (L) spatial pattern was clustered up to distance of 21 m and then changed to random pattern. In height class (M) spatial pattern was aggregated up to distance 8 meter and then changed to random pattern and in height class (U) Fagus orientalis showed random spatial pattern in all distances. Bivariate O-ring analysis showed positive correlation between trees at height class (S) and other height classes up to 30-40 m. Present study showed application of O-ring statistic in vertical structure analysis of forest ecosystems.

کلیدواژه‌ها [English]

  • Fagus orientalis Lipsky
  • Kheyroud forest
  • O-ring function
  • Spatial Associations
  • spatial point pattern
  • and vertical structure

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