بررسی ساختار، فیزیونومی و نیازهای رویشگاهی گونۀ زربین (Cupressus sempervirens var. horizontalis) در منطقۀ اشکور رحیم‌آباد رودسر، استان گیلان

نوع مقاله : مقاله پژوهشی


1 کارشناسی ارشد جنگل‌شناسی و اکولوژی جنگل، دانشکدۀ منابع طبیعی، دانشگاه گیلان، صومعه‌سرا، ایران

2 استاد گروه جنگلداری، دانشکدۀ منابع طبیعی، دانشگاه گیلان، صومعه‌سرا، ایران

3 دانشیار گروه جنگلداری، دانشکدۀ منابع طبیعی، دانشگاه گیلان، صومعه‌سرا، ایران


شناخت ساختار وضعیت جنگل‌ها به‌ویژه اکوسیستم‌های جنگلی که در ارتفاعات فوقانی با عوامل تهدیدکننده از جمله شرایط سخت کلیماتیک و فرسایش خاک مواجه‌اند، ضرورتی انکارناپذیر است. این مطالعه به‌منظور بررسی ساختار، فیزیونومیک و نیازهای رویشگاهی گونۀ زربین (Cupressus sempervirens L. f. horizontalis (Mill.)) با هدف دستیابی به اطلاعات پایۀ این گونه نسبت به عوامل خاکی و فیزیوگرافی در منطقۀ اشکور رحیم‌آباد رودسر انجام گرفت. به این منظور، 30 قطعه‌‌نمونۀ دایره‌ای‌ شکل هریک به مساحت 1000 متر مربع با استفاده از روش انتخابی برداشت و در داخل هریک از قطعات نمونۀ قطر تمام گونه‌های درختی با قطر برابرسینه بیشتر از 5/7 سانتی‌متر اندازه‌گیری شد. همچنین گونه‌های درختچه‌ای داخل قطعات نمونه شمارش شد. از هر قطعه‌نمونه یک نمونه خاک (به‌عنوان نمونۀ خاک معرف) از عمق صفر تا 10 سانتی‌متر برداشت شد. نتایج نشان داد که ساختار تودۀ جنگلی ناهمسال بود. در لایۀ درختی شکل‌های رویشی سوزنی‌برگ و پهن‌برگ، در لایۀ درختچه‌ای درختچه‌های خزان‌کننده و در لایۀ علفی نیز گیاهان علفی غیرگندمی غالب بودند. در بین عوامل محیطی جهت جغرافیایی و بافت خاک بر روی قطر، ارتفاع و تراکم گونۀ زربین مؤثر بودند. تراکم درختان (تعداد در هکتار) همبستگی مثبت و منفی معنی‌داری را به‌ترتیب با درصد شن و جهت جغرافیایی نشان دادند. بیشترین پراکنش این گونه نیز در دامنه‌های خشک جنوبی مشاهده شد و سایر جهات تراکم کمتری از این گونه را به خود اختصاص دادند.


عنوان مقاله [English]

Investigation on structure, physiognomic and habitat needs of Mediterranean cypress (Cupressus sempervirens var. horizontalis) in Eshkevar of Rahimabad, Rudsar, Guilan province

نویسندگان [English]

  • Fateme Pourkakroudii 1
  • Hassan Pourbabaei 2
  • Ali Salehi 3
1 M.Sc. Silviculture and Forest Ecology, Department of Forestry, Faculty of Natural Resources, University of Guilan, Sowmehsara, I.R. Iran
2 Prof., Department of Forestry, Faculty of Natural Resources, University of Guilan, Sowmehsara, I.R. Iran
3 Assoc., Prof., Department of Forestry, Faculty of Natural Resources, University of Guilan, Sowmehsara, I.R. Iran
چکیده [English]

Plant distribution in forest ecosystems is not accidental and influenced by various factors. This study was done to investigate the structure, physiognomy and site requirements of Mediterranean cypress species (Cupressus sempervirens var. horizontalis) in order to achieve the basic structure, physiognomy and site requirements information of this species relative to soil and physiographic factors in Eshkevar, Rahimabad, Rudsar. For this purpose, 25 circular plots, each one with 1000-m2, were located according to random sampling. In each plot, type of tree and shrub species were designated; then, diameter at breast height (DBH) of trees more than 7.5 cm was measured. In each plot, soil sample were taken from 0 to 10 cm depth. The results indicated that stand structure was uneven-aged. Physiognomy studies showed that in tree, shrub, and herbaceous layers, broad- leaved and need-leaved trees, deciduous shrubs, and forbs were, respectively, dominance life forms. Between environmental factors, aspect and soil textures were effective on diameter, height and individual number of Mediterranean cypress. Number of species had a positive and negative correlation with sand percentage and aspect, respectively.

کلیدواژه‌ها [English]

  • Composition
  • environmental factor
  • physiognomy
  • Cupressus sempervirens
  • Hyrcanian forests
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