بررسی خصوصیات کمّی راش شرقی نسبت به عوامل توپوگرافی در جنگل‌‌های ناو‌‌اسالم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، گروه باغبانی، واحد رشت، دانشگاه آزاد اسلامی، رشت، ایران

2 کارشناسی ارشد، گروه جنگل‌داری، دانشگاه گیلان، رشت، ایران

چکیده

هدف: گونه راش ﺷﺮﻗﻲ ﺣﺪود یک‌‌‌سوم از وﺳﻌﺖ و ﺑﻪ همین ﻧﺴﺒﺖ حجم سرپا را در توده‌‌های آمیخته و تا حدودی خالص جنگل‌‌های ﺷﻤﺎل اﻳﺮان در برمی‌‌گیرد. یکی از عوامل مؤثر بر خصوصیات کمّی درختان، عوامل فیزیوگرافی است. تحقیق حاضر به‌‌‌منظور بررسی تأثیر عوامل توپوگرافی بر خصوصیات کمّی گونه راش انجام شد.
مواد و روش‌ها: در این پژوهش جنگل‌های منطقه ناو اسالم به عنوان نمونه در استان گیلان انتخاب شد. با توجه به هدف تحقیق، قطر برابرسینه و ارتفاع درختان راش در سه ‌طبقه ارتفاعی (800 تا 1650 متر)، پنج کلاسه شیب (0 تا 50 درصد) و چهار جهت اصلی جغرافیایی اندازه‌گیری و در فرم‌‌‌های مربوطه ثبت گردید.
نتایج: نتایج آزمون تجزیه واریانس یک‌‌‌طرفه نشان داد، تأثیر دو عامل شیب زمین و ارتفاع از سطح دریا بر مشخصه‌‌‌های کمّی گونه راش معنی‌‌‌دار است که به‌‌‌منظور مقایسه میانگین‌‌‌ها از آزمون دانکن استفاده
شد. نتایج نهایی حاکی از این بود که کم‌ترین و بیشترین میزان مشخصه‌های کمّی به ترتیب در ارتفاع
1300-1440 و 1440-1650 متر وجود دارد؛ در بررسی شیب زمین نیز بیشترین میزان قطر، سطح مقطع و ارتفاع درختان راش در شیب 40-50 درصد به‌‌دست آمد.
نتیجه‌گیری: با توجه به سرشت و خصوصیات اکولوژیکی راش، بهترین رویشگاه درختان این‌ گونه برای داشتن بیشترین قطر و ارتفاع، مناطق بالادست و شیب‌‌‌دار است.
 
 

کلیدواژه‌ها


عنوان مقاله [English]

Investigating the quantitative characteristics of eastern beech in relation to topographic factors in forests of Asalem Nav

نویسندگان [English]

  • Alireza Eslami 1
  • Fatemeh Badr 2
1 Associate Professor, Department of Horticulture, Rasht Branch, Islamic Azad University, Rasht, Iran
2 MSc. Department of Forestry, Guilan University, Rasht, Iran.
چکیده [English]

Background: The fagus orientalis lipesky species includes around one-third of width and correspondingly, the standing volume in the mixed and partly pure stands of northern forests of Iran.. Present research has been carried out to investigate the effects of topographic factors on quantitative characteristics of oriental beech species in Nav Asalem forestry plan.
Methods: According to purpose of the research, breast height diameter and height of the oriental beech trees were measured in three altitude levels (800 to 1650 m), five slope classes (0 to 50) and four main geographical classes and recorded on the corresponding forms.
Results: The results of one-way variance analysis test showed that two factors of slope and the sea-level altitude had significant effects on quantitative characteristics of oriental beech species wherein Dunkan’s test was used to compare the means and eventually, the results showed that the lowest and highest rates of quantitative characteristics existed respectively in heights of 1300-1440m and 1440-1650m. Also, studying the slope, the highest diameter, cross-section and height of the beech trees were obtained in a slope of 40-50 percents.
Conclusion: Thus, due to the nature and ecological characteristics of oriental beech and since the best habitats for the trees of this species to have the greatest diameter and height are the upstream and sloping regions, the results of this research show that Nav Asalem forest habitat is one of the best habitats of the target species.
 
 

کلیدواژه‌ها [English]

  • Topography
  • beech stands
  • quantitative characteristics
  • Nav Asalem
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