روند تغییرات جرم‌حجمی پایه و رطوبت سبز در راستای طولی و شعاعی تنه درختان ممرز‎ (‏Carpinus betulus L.‎‏) در جنگل‌های هیرکانی‏

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی کارشناسی‌ارشد، گروه علوم و مهندسی جنگل، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران. ‏

2 استاد، گروه علوم و مهندسی جنگل، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران. ‏

3 استادیار، بخش تحقیقات منابع طبیعی، سازمان تحقیقات، آموزش و ترویج کشاورزی، ساری، ایران. ‏

4 دکتری، گروه علوم و مهندسی جنگل، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ‏ایران.

چکیده

این پژوهش با هدف بررسی روند تغییرات جرم‌حجمی پایه و رطوبت سبز درختان بادافتاده ممرز در جهت طولی (در راستای طول تنه درخت) و جهت شعاعی (از مغز به پوست) چوب تنه انجام شد. از این‌رو از 10 درخت بادافتاده ممرز در طبقات قطری 40-20، 60-40 و 80-60 و درجه پوسیدگی مختلف (درجه 1، 2 و 3) دیسک کامل تهیه شد. دیسک‌ها در فواصل 5، 35 و 65 درصد از طول تنه تهیه شدند. قطعات نمونه با حجم ثابت 2×2×2 سانتی‌متر مکعب به نسبت 10، 50 و 90 درصد از شعاعی دیسک‌ها تکه‌برداری شده و جرم‌حجمی پایه و رطوبت سبز آن­ها به‌دست آمد. نتایج نشان داد که رطوبت سبز و جرم‌حجمی پایه تنه درختان ممرز در طبقات قطری مختلف با احتساب درجات پوسیدگی‌ تفاوت معنی‌دار دارد. بیشترین میانگین مقادیر جرم‌حجمی پایه در فاصله 5 درصد در راستای طولی و 90 درصد در راستای شعاعی چوب تنه به‌ترتیب با 59/0 و 60/0 گرم بر سانتی‌متر مکعب و بیشترین میانگین مقادیر رطوبت سبز در 90 درصد در راستای شعاعی به‌­مقدار 65/0 و فاصله 5 درصد در راستای طولی به‌مقدار 66/0 مشاهده شد. نتایج همبستگی نشان داد جرم‌حجمی پایه، بیشترین مقدار همبستگی معنی‌داری را با قطر برابر سینه و کمترین مقدار همبستگی معنی‌داری را با رطوبت سبز دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Trend of changes in basic density and green moisture content in the vertical and radial ‎direction of hornbeam tree trunks (Carpinus betulus L.) in Hyrcanian forests

نویسندگان [English]

  • Fatere Bakhshi 1
  • Asghar Fallah 2
  • Ali Asghar Vahedi 3
  • Mojtaba Imani Rastabi 4
1 M.Sc. of Forestry, Faculty of Natural Resources, Sari Agriculture Science and Natural Resources University, ‎Sari, I.R. Iran. ‎
2 Professor, Faculty of Natural Resources, Sari Agriculture Science and Natural Resources University, Sari, I.R. ‎Iran. ‎
3 Assistant Professor, Research Division of Natural Resources, Mazandaran Agricultural and Natural Resources ‎Research and Education Center, AREEO, Sari, I.R. Iran. ‎
4 Ph.D, Faculty of Natural Resources, Sari Agriculture Science and Natural Resources University, Sari, I.R. Iran. ‎
چکیده [English]

The aim of this study was to investigate the trend of changes in basic density and green moisture content of hornbeam trees in the vertical and radial direction of trunk wood. Therefore, a complete disk was prepared from 10 fallen trees in 20-40, 40-60 and 60-80 diameter classes and different decay degrees (grades 1, 2 and 3). The disks were prepared at intervals of 5, 35 and 65% of the vertical sections of the trunk. Then, the sample pieces with a fixed volume of 2× 2× 2 cm3 were fragmented at a ratio of 10, 50 and 90% of the radial sections of the disks and were obtained their basic density and green moisture content. The results showed that the green moisture content and trunk basic density of hornbeam trees in different diameter classes with the degree of decay had a significant difference with a probability of 99% (P <0.001). The highest mean basic density values were observed in the distance of 5% in the vertical direction and 90% in the radial direction of the trunk wood with 0.59 and 0.60 g / cm3, respectively. The highest mean values of green moisture content were observed in 90% in the radial direction of 0.65 and the distance of 5% in the vertical direction of 0.66. Of course, green moisture content in vertical sections showed a significant difference with changing the degree of decay (P> 0.05), but no significant difference was observed in radial sections. The results of correlation showed that basic density has the highest significance correlation with diameter equal to the breast and the lowest significance correlation with the coefficient of moisture.

کلیدواژه‌ها [English]

  • Density
  • degree of decay
  • wood moisture
  • Biomass
  • diameter classes
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