تعیین معادله ضریب‌شکل تنه مناسب برای صنوبر دلتوئیدس (Populus deltoides Marsh) در ایستگاه تحقیقات البرز کرج

نوع مقاله : علمی- پژوهشی

نویسندگان

1 استادیار دانشگاه محیط زیست

2 استادیار موسسه تحقیقات جنگلها و مراتع کشور

3 دانشیار موسسه تحقیقات جنگلها و مراتع کشور

4 مربی پژوهشیار موسسه تحقیقات جنگلها و مراتع کشور

چکیده

صنوبر دلتوئیدس (Populus deltoides Marsh) ازنظر رشد و تولید چوب در واحد سطح نسبت به گونه‌های دیگر از وضعیت بهتری برخوردار است‌، ازاین‌رو می‌تواند به‌عنوان یکی از گونه‌های مهم در زراعت چوب، با هدف تولید و تأمین چوب موردنیاز صنایع کشور مورد استفاده قرار گیرد. در این تحقیق به‌منظور تعیین ضریب‌شکل حقیقی، تعداد 40 اصله درخت انتخاب شد و متغیرهای طول تا دقت سانتی‌متر، قطر در محل نصف ارتفاع کل درخت (ارتفاع کنده و طول تنه افتاده)، قطر در محل 1/0، 3/0، 5/0، 7/0 و 9/0 ارتفاع درخت و همچنین قطر بالایی هر بینه دومتری درخت تا قطر پنج سانتی‌متری ساقه در تمام درختان قطع‌شده اندازه‌گیری شد. سپس ضریب‌شکل حقیقی درخت محاسبه و با ضریب‌شکل طبیعی، ضریب‌شکل هوهه‌نادل و ضریب‌شکل مصنوعی مقایسه شد. نتیجه به‌دست‌آمده از مقایسه میانگین ضرایب‌شکل در طبقات قطری مختلف به‌روش تجزیه‌واریانس دوطرفه (ANOVA) نشان داد که بین میانگین ضریب‌شکل‌ها در طبقات قطری 15 و 25 سانتی‌متر با سایر طبقات قطری تفاوت معنی‌داری وجود دارد و به‌جز ضریب‌شکل مصنوعی درخت، سایر ضرایب‌شکل تفاوت معنی‌داری را با ضریب‌شکل حقیقی درخت نشان نمی‌دهند. همچنین استفاده از ضریب‌شکل حقیقی 5028/0 در منطقه موردپژوهش، حجم حقیقی صنوبر دلتوئیدس را نشان می‌دهد و در دیگر مناطق با محاسبه ضرایب‌شکل جایگزین می‌توان به دقتی نزدیک به ضریب‌شکل حقیقی در تعیین حجم صنوبر دلتوئیدس رسید.
 

کلیدواژه‌ها

عنوان مقاله [English]

Determining the best stem form factor equation for populous deltoides in poplar plantations of Alborz Research Station, Karaj

نویسندگان [English]

  • Ali Jahani 1
  • Mohsen Kalagari 2
  • Alireza Modirrahmati 3
  • Rafatollah Ghasemi 4
1 Assistant Prof., Department of Natural Resources and Environment Sciences, University of Environment, Karaj, I.R. Iran.
2 Assistant Prof., Research Institute of Forests and Rangelands, Tehran, I.R. Iran
3 Associate Prof., Research Institute of Forests and Rangelands, Tehran, I.R. Iran.
4 Senior Research Expert, Research Institute of Forests and Rangelands, Tehran, I.R. Iran.
چکیده [English]

Populous deltoides has been proven to exceed other poplar clones in terms of growth and wood production per unit area. Thus, it is generally considered as one of the most crucial species for pulp and paper-oriented wood plantations in Iran. Here, a number of 40 trees was selected for developing true form factor (TFF) of P. deltoides. Prior to felling, the height and diameter of trees were measured. Following the felling, a set of variables including the length of tree (cm-accurate), the diameter in the 1/2 of total tree height (i.e. stump height + the length of felled tree), the diameter in 0.1, 0.3, 0.5, 0.7 and 0.9 of tree height and the top diameter of each 2 meter-high log (up to 5 cm stem diameter) were measured. Then, the Artificial, Hohenadl and Natural form factors were calculated, which were then compared with the TFF. The two-way ANOVA-based comparison of means amongst the form factors in different diameter classes revealed significant differences amongst the form factors of 15 and 25 cm with other diameter classes. All form factors showed insignificant differences except for the Artificial form factor which revealed to be significantly different than the TFF. Furthermore, the real tree volume across the study site can be derived by the calculated TFF value of 0.5028. For similar sites, this study concludes the alternative form factors (Hohenadl or Natural) to be able to be used for calculating standing volume being comparable to the real volume of P. deltiodes.
 

کلیدواژه‌ها [English]

  • Populous deltoides
  • true form factor
  • Artificial form factor
  • Hohenadl form factor
  • natural form factor
  • Karaj

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