ارزیابی جنگلکاری‌های بیست‌وپنج‌سالۀ کاج تدا، توسکای قشلاقی، افرا پلت و بلندمازو در منطقۀ رادارپشتۀ استان گیلان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری علوم جنگل، واحد لاهیجان، دانشگاه آزاد اسلامی، لاهیجان، ایران

2 دانشیار گروه جنگلداری، واحد لاهیجان، دانشگاه آزاد اسلامی، لاهیجان، ایران

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

4 دانشیار گروه علوم و مهندسی خاک، دانشکدۀ کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل

چکیده

جنگلکاری از مهم‌ترین اقدام‌ها در ایجاد پوشش سبز و تأمین چوب به‌شمار می‌رود. پژوهش حاضر با هدف ارزیابی عملکرد جنگلکاری‌های بیست‌وپنج‌سالۀ منطقۀ رادارپشتۀ استان گیلان به انجام رسید. در این پژوهش هشت قطعه نمونۀ 400 متر مربعی در چهار تودۀ سه‌و‌نیم‌هکتاری افرا پلت، توسکا، بلندمازو و کاج تدا (در مجموع 32 قطعه نمونه) با روش منظم تصادفی اجرا و در آنها قطر، ارتفاع، طول تنۀ بدون شاخه، قطر بزرگ و کوچک تاج برداشت شد. عمق لاشبرگ نیز در ده نقطه از قطعات نمونه با خط‌کش اندازه‌گیری شد. همچنین کیفیت تنۀ درختان به سه دستۀ درجه یک، دو و سه تقسیم‌ شد. با استفاده از داده‌های برداشت‌شده مهم‌ترین شاخص‌های کمی و کیفی چهار توده استخراج و مقایسۀ آماری شد. همچنین با استفاده از معادلات آلومتریک موجود برای گونه‌های تحت بررسی، زی‌تودۀ درختان برآورد شد. براساس نتایج به‌دست‌آمده بیشترین میانگین قطر (42/33 سانتی‌متر)، رویش قطری (23/1 سانتی‌متر)، سطح مقطع (43/78 متر مربع در هکتار)، حجم (98/763 متر مکعب در هکتار)، زی‌توده (5/971 تن در هکتار)، تنۀ درجه 1 (92 درصد)، ضخامت لاشبرگ (6/8 سانتی‌متر) و کمترین ضریب قدکشیدگی (78/0) مربوط به تودۀ کاج تدا بود. در میان گونه‌های پهن‌برگ، بیشترین حجم و زی‌توده به‌ترتیب با 458 متر مکعب و 75/520 تن در هکتار مربوط به گونۀ توسکا بود. بنابراین گونۀ تدا با توجه به تولید زیاد (به‌صورت کنترل‌شده در اراضی غیرجنگلی) و گونۀ بلندمازو با توجه به عملکرد مطلوب در کنار تولید پایه‌های باکیفیت برای جنگلکاری در استان توصیه می‌شوند.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of 25-year-old afforestation's of loblolly pine, black alder, velvet maple and chestnut leaved oak in Radar Poshteh area of Guilan province

نویسندگان [English]

  • A. Ebrahimi Ashbella 1
  • M.M. Fallahchai 2
  • A. Salehi 3
  • A.A. Soltani Tolarood 4
1 Ph.D. Student of Forestry, Dept. of Forestry, Lahijan Branch, Islamic Azad University, Lahijan, I. R. Iran
2 Associate Prof., Dept. of Forestry, Lahijan Branch, Islamic Azad University, Lahijan, I. R. Iran
3 Associate Prof., Dept. of Forestry, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, I. R. Iran
4 Associate Prof., Dept. of Soil Science Engineering Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardebili, Ardebili, I. R. Iran
چکیده [English]

Afforestation is one of the most important tools in creating green cover and providing wood supply. The aim of current study was to investigate the growth and performance of 25-year-old afforestation's in the Radar-Poshteh region of ​​Guilan province. In this study, eight sample plots of 400 square meters in four 3.5-hectare stands of maple, black alder, chestnut leaved oak and loblolly pine were executed by randomized systematic method and within each sample plot, diameter, height, trunk length without branches, large and small diameter of the crown were measured. Litter depth was also measured at ten points in the sample plots with a ruler. Also, the quality of tree trunks was divided into three categories: grade 1, 2 and 3. Using the collected data, the most important quantitative and qualitative indicators of the four stands were extracted and statistically compared. Also, the biomass of the trees was estimated using the reported allometric equations for the studied species. Based on the results, the highest average diameter (33.42 cm), diameter growth (1.23 cm), highest basal area (78.43 m2/ha), volume (763.98 m3/ha), biomass (971.5 ton/ha), grade 1 trunks (92%), litter thickness (8.6 cm) and the lowest height form factor (0.78) were obtained for loblolly pine stand. Among the native broadleaf species, the highest volume and biomass were calculated with 458 m3 and 520.75 ton/ha for alder species, respectively. Therefore, loblolly pine due to its high production (Controlled in non-forest lands) and chestnut leaved oak due to its high yield along with the production of high quality timbers are recommended for afforestation in Guilan province.

کلیدواژه‌ها [English]

  • maple
  • Chestnut-leaved oak
  • alder
  • Volume
  • Biomass
 
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دوره 14، شماره 1
خرداد 1401
صفحه 15-26
  • تاریخ دریافت: 05 اردیبهشت 1400
  • تاریخ بازنگری: 13 خرداد 1400
  • تاریخ پذیرش: 08 تیر 1400
  • تاریخ اولین انتشار: 01 خرداد 1401