تغییرات ویژگی‌های ریخت‌شناسی برگ درختان راش شرقی (Fagus orientalis Lipsky) در طول گرادیان ارتفاع از سطح دریا (بررسی موردی: جنگل‌های گیلان، ماسال)

نوع مقاله : علمی - پژوهشی


1 دانشجوی دکترای جنگل‌شناسی و اکولوژی جنگل، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه سرا، ایران

2 استاد، گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه سرا، ایران ، ایران

3 استاد، گروه بیوتکنولوژی، دانشکده کشاورزی، دانشگاه گیلان، رشت، ایران


هدف از این پژوهش بررسی تغییرات ویژگی­های برگ راش شرقی با توجه به تغییرات ارتفاعی بود. سه جمعیت از این گونه به­ترتیب در ارتفاع 700 ، 1200 و 1700 متر از سطح دریا در جنگل‌های ماسال در استان گیلان انتخاب شد. در مرداد ماه تعداد 20 پایه درختی به‌طور تصادفی در سه ارتفاع از سطح دریا انتخاب شد. سپس از هر درخت تعدادی برگ از بخش جنوبی و شمالی تاج درختان سالم و بالغ جمع‌آوری شد. ویژگی‌های ریخت‌شناسی برگ شامل طول برگ، عرض برگ، طول دمبرگ، شاخص برگ، شاخص دمبرگ، فاصله بین پایه تا پهن‌ترین قسمت برگ (BW)، سطح برگ، سطح ویژه برگ، وزن خشک، وزن ویژه برگ و محتوای آب نسبی اندازه‌گیری شد. نتایج حاکی از وجود تغییرات در صفات برگ گونه راش با افزایش ارتفاع بود. این تغییرات در برخی از صفات کاهشی (طول برگ، شاخص برگ، وزن ویژه برگ) و در برخی دیگر افزایشی (طول دمبرگ، شاخص دمبرگ، BW، سطح برگ، سطح ویژه برگ، محتوای آب نسبی) بود. نتایج نشان داد که برخی از ویژگی‌های ریخت‌شناسی و مورفوفیزیولوژیکی اندازه‌گیری­ شده در جمعیت‌های مختلف، دارای اختلاف معنی‌داری در سطح احتمال پنج درصد بودند. نتایج حاکی از وجود تغییرات در صفات برگ گونه راش شرقی با افزایش ارتفاع است.


عنوان مقاله [English]

Changes in leaf morphological characteristics of Fagus orientalis Lipesky along altitudinal gradients (Case study: Gilan forests, Masal)

نویسندگان [English]

  • Mahboobe Mohebbi Bijarpas 1
  • Teymour Rostami shahraji 2
  • Habiboala samizadeh 3
1 PhD Student of Forestry, Faculty of Natural Resources, University of Guilan, Someh Sara, I. R. Iran
2 Professor, Faculty of Natural Resources, University of Guilan, Someh Sara, I. R. Iran
3 Professor, Faculty of Agricultural Sciences, Department of Plant Biotechnology, University of Guilan, Rasht, I. R. Iran
چکیده [English]

Plant functional traits reflect their responsiveness and adaptability to environmental changes. Leaf traits influence the adaptation of plants to environmental changes and determine the community structure and function of ecosystem. The objective of the present study was to determine the oriental beech leaf traitschanges regarding to elevation gradients. Thus, three populations of this species were selected at 700 m a.s.l, 1200 m a.s.l and 1700 m a.s.l in Masal forests in Guilan province, respectively. In each altitude, in August, 20 tree stands were selected randomly. Then, from each tree stand, number of leaves were collected from southern and northern parts of the crown of healthy and mature trees. Then, some morphological characteristics (leaf length, leaf width, petiole length, leaf index, petiole index, leaf area distance to the widest leaf area) and morphophysiological characteristics (leaf area, specific leaf area, dry weight, specific dry weight and relative water content) were measured. The results indicate changes in the traits of beech leaves with increasing altitude. This process was shown decreasing in some of traits (leaf length, leaf index, and specific dry weight) and in others increasing (petiole length, petiole index, BW, leaf area, Specific leaf area, and relative water content). The results showed that some morphological and morphophysiological characteristics measured in different populations have a significant difference in the level of 0.05%. The results show that with increasing elevation, the leave traits of Fagus orientalis were changed.

کلیدواژه‌ها [English]

  • Adaptation
  • Climate change
  • Leaf morphology
  • Morphophysiological characteristics
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