بررسی ترکیب و تنوع‌ گونه‌ای توده‌های شاخه و دانه‌زاد جنگل‌های ارسباران

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشیار، گروه جنگلداری، دانشکده کشاورزی و منابع طبیعی اهر، دانشگاه تبریز، تبریز، ایران

2 دانش‌آموخته دکتری جنگلداری، دانشکده منابع طبیعی، دانشگاه ارومیه، ارومیه، ایران

چکیده

تشریح کمی توده­های جنگلی از نظر ترکیب و تنوع گونه­ای به­عنوان یکی از مهم­ترین ابزارها در مدیریت جنگل است. هدف از پژوهش پیش­رو، بررسی ترکیب و تنوع گونه­ای توده­های شاخه و دانه­زاد جنگل­های ارسباران است. برای انجام این پژوهش در منطقه مورد بررسی 24 قطعه­نمونه مستطیلی شکل به مساحت نیم هکتار (با ابعاد 50 متر در 100 متر) به­صورت منظم تصادفی پیاده شد. در هر قطعه­نمونه­ با استفاده از روش آماربرداری صددرصد، مشخصه­های ساختاری توده شامل گونه، تعداد جست، قطر و ارتفاع جست­گروه اندازه­گیری شد. برای بررسی تنوع زیستی از شاخص­ تنوع شانون-وینر، غنای مارگالف و یکنواختی پایلو استفاده شد. نتایج نشان داد که ممرز (8/63 درصد) به­عنوان گونه­ غالب و اوری (7/26 درصد) و افرا کرب (5/4 درصد) جزء گونه­های همراه با بیشترین فراوانی بودند. میانگین ارتفاع، قطر جست گروه به­ترتیب 45/6 متر، 14/12 سانتی­متر به­دست آمد. بیشترین و کمترین مقدار شاخص تنوع­زیستی مربوط به شاخص پایلو (01/1) و شاخص مارگالف (71/0) است. پژوهش نشان داد پراکنش قطری توده حاکی از همسال و جوان بودن توده و ­شکل زنگوله­ای پراکنش ارتفاعی نیز بیانگر تجمع بیشترین جست­ها در طبقات ارتفاعی میانی است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigating the composition and species diversity of coppice with standard (CWS) stands in Arasbaran forests

نویسندگان [English]

  • Sajad Ghanbari 1
  • ayeshe esmaili 2
1 Associate Professor, Department of Forestry, Ahar Faculty of Agriculture and Natural Resources, University of Tabriz, Ahar, I. R. Iran
2 Ph.D. of Forestry, Faculty of Natural Resources, Urmia University, Urmia, I. R. Iran
چکیده [English]

Quantitative description of forest stands in terms of the composition and species diversity is used as one of the most important tools in forest management. This research investigates the composition and species diversity of the coppice with standard stands of Arasbaran forests. In order to carry out this research, 24 rectangular sample plots with an area of ​​half a hectare (with dimensions of 50 meters by 100 meters) were randomly surveyed in the study area. Inside these samples, the structural characteristics of the stands, including the species, Coppice shoots, the diameter and the height of the sprout-clump, were measured using the 100% statistical method. Shannon-Wiener diversity index, Margalf richness and Pylo's uniformity were used to check biodiversity. The results showed that Carpinus betulus L. (63.8 percent) was the dominant species and Quercus macranthera (26.7 percent) and Acer campestre (4.5 percent) were among the species with the highest abundance. The average height and DBH were 6.45 meters and 12.14 cm, respectively. The highest and lowest values ​​of the biodiversity index are related to the Pylo index (1.01) and the Margalef index (0.71). The research showed that the diagonal distribution of the stand indicates that the stand is of the same age and young, and the bell shape of the height distribution also indicates the accumulation of the most searches in the middle altitude classes.

کلیدواژه‌ها [English]

  • Arasbaran
  • Quercus macranthera
  • Species diversity
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