رابطۀ ارتفاع از سطح دریا، شیب، و سن درخت با دل ‏قرمزی راش (Fagus Orientalis Lipsky) در جنگل‏ های حوزۀ شفارود گیلان

نوع مقاله : مقاله پژوهشی

نویسنده

دانشیار دانشکدۀ منابع طبیعی، دانشگاه گیلان، صومعه ‏سرا، ایران

چکیده

در این تحقیق، رابطۀ ارتفاع از سطح دریای آزاد، شیب زمین، و سن درخت با پدیدۀ دل‏قرمزی راش در جنگل‏های حوزۀ شفارود بررسی شد. برای جمع‏آوری داده از روش خط نمونه استفاده شد. نتایج این بررسی نشان داد که از 476 اصله درخت نمونه، 132 اصله به پدیدۀ دل‏قرمزی مبتلا بودند. درختان مبتلا به دل‏قرمزی در جنگل‏های حوزۀ شفارود، با اطمینان 95 درصد در بازۀ 6/4 ± 7/27 درصد قرار گرفته بودند. در این بررسی مشخص شد که میانگین نسبت دل‏قرمزی () در سه منطقۀ ارتفاعی از نظر آماری معنی‏دار است. نسبت دل‏قرمزی () در منطقۀ 1000 تا 1500 متر ارتفاع از سطح دریا از دو منطقۀ دیگر بیشتر بود. ضریب همبستگی بین نسبت مساحت دل‏قرمزی () تعداد 132 اصله درخت با شیب عرصه برای مشخص‏شدن رابطۀ این دو متغیر ( = 0.271  , p- value = 0.097) محاسبه شد که با اطمینان 95 درصد بین مساحت دل‏قرمزی و شیب عرصه وابستگی معنی‏دار وجود نداشت. شکل دل‏قرمزی در مقطع درختان گونۀ راش طرح مشخصی نداشت و به شکل و اندازه‏های مختلف دیده شد. نتایج نشان داد که با افزایش سن درختان، درصد فراوانی دل‏قرمزی نیز بیشتر می‏شود و از 150 سالگی با شدت بیشتر گسترش می‏یابد؛ به‏طوری که این نسبت، در مراحل رویشی مسن به جوان برابر با 74/2 بوده است.

کلیدواژه‌ها

عنوان مقاله [English]

Relationship between Altitude, Slope and Tree Age with Red Heartwood of Beech (Fagus orientalis Lipsky) in Shaffarud Forest Area

نویسنده [English]

  • Amireslam Bonyad
Associate Professor, Forestry Department, Faculty of Natural Resources, Guilan University, Sooma-sara, I.R. Iran
چکیده [English]

The relationship between altitude, slope and tree age with the red heartwood of Beech (Fagus
orientalis Lipsky) were investigated. Transect sampling method was used to collect the data. The
results showed that in the 476 sampled trees, 132 trees were suffering the phenomenon of red hearts
with deferent shape and size. The results indicate that the tree with red heartwoods in Shafa-roud
forest area, with 95% confidence intervals were 27.7 ± 4.6 percent. The mean values (Ki ) of the red
heartwood were significantly different in three altitude forest areas. The relationship between altitude
variations and red heartwood were significantly different. The relationship between slope variations
and red heartwood were not significant ( ˆr = 0.271, p- value = 0.097). The results of this study indicate
that the frequency of the red heartwood was increased in older stands and was extended when the
stands become older than 150 years. The ratio of red heartwood in older and young stands was 2.74.

کلیدواژه‌ها [English]

  • false heartwood
  • Forest
  • red orientalis
  • Shafa-roud
  • transect sampling method

مراجع

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