Volume 9, Issue 18 (9-2021)                   Ecol Iran For 2021, 9(18): 196-209 | Back to browse issues page

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akbari mazdi R, mataji A, fallah A. (2021). Gap structure and its relationship with regeneration status in beech forests of Haftkhal region, Sari.. Ecol Iran For. 9(18), 196-209. doi:10.52547/ifej.9.18.196
URL: http://ifej.sanru.ac.ir/article-1-382-en.html
islamic azad university
Abstract:   (2646 Views)
Introduction and objective: Studying and evaluating the canopy gaps structure provides an accurate understanding of the process of forest stands dynamics as well as natural disturbances that play an important role in the future management of the forest ecosystem. The purpose of this study was to investigate the relationship between gaps and quantitative and qualitative characteristics of regeneration in the natural forest of Haftkhal in Mazandaran province.
Materials and method: For this purpose, gaps in the area were identified and recorded. Then the characteristics of collar diameter, height, seedling abundance in growth stages were recorded. According to the smallest and largest gap area, gaps divided into three classes of small (less than 300 m2), medium (300 to 600 m2), and large (more than 600 m2).
Results: The results showed that gaps area was 3.65% of the total study area. In terms of area, 85% of the gaps were in small and medium-sized classes, which could indicate small-scale disturbances. The relationship between the gap area and perimeter and the study of Miller's elongation index showed more elliptical shape in small gaps to a circular shape in large gaps. The value of the Miller elongation index in small, medium and large gap area classes was 0.42, 0.59 and 0.86, respectively. The results showed that 85% of the regenerations in the gaps were related to the beech species. The highest frequency of regenerations was in the pole stage with a diameter of less than 5 cm and a height of 4 to 8 meters, which is an essential factor in starting the competition for light. Comparisons also showed that the frequency, diameter growth, and height growth of regenerations decreased significantly with increasing canopy gap area due to ecological needs, especially shade-tolerant growth of beech species, which provided by small canopy gap area.
Conclusion: Finally, the results indicate that pathways smaller than 600 m2 have more suitable conditions and in forest management, the creation of gaps larger than 600 m2 should be avoided as much as possible.
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Type of Study: Research | Subject: اکولوژی جنگل
Received: 2020/05/6 | Accepted: 2020/09/13 | Published: 2022/01/8

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