ارزیابی روش‌‌های تجدید حجم 3P و صددرصد (مطالعه موردی: طرح جنگل‌داری پرچیوا)

نوع مقاله: علمی- پژوهشی

نویسندگان

1 دانشجوی دکترای جنگل‌داری، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران

2 دانشجوی دکترای جنگل‌داری، دانشکده منابع طبیعی، دانشگاه گیلان، گیلان، ایران

3 کارشناس، سازمان جنگل‌ها، مراتع و آبخیزداری کشور، تهران، ایران

چکیده

تجدید حجم به‌روش 3P به‌منظور کاهش کار میدانی و کاهش هزینه‌‌ها، جایگزین تجدید حجم صددرصد شده است. هدف از این پژوهش، مقایسه روش تجدید حجم 3P با روش صددرصد، شناخت بهتر و ارائه روش‌‌ مناسب در بخش اجرا است. برای این منظور، در طرح جنگل‌داری پرچیوا در استان مازندران، 1184 اصله درخت از گونه‌‌های افرا، انجیلی، توسکای ییلاقی، راش و ممرز بررسی شد. حجم درختان ابتدا به‌روش تجدید حجم صددرصد، سپس به‌تفکیک حجم صنعتی، هیزمی و کل بر اساس شیوه‌نامه روش 3P اندازه‌‌گیری شد. برآورد حجم درختان از طریق تجدید حجم 3P در 10 تکرار انجام شد. نتایج آزمون t جفتی نشان داد که در حجم برآوردشده برای افرا، انجیلی و توسکای ییلاقی، تفاوت معنی‌‌داری در سطح اطمینان 95 درصد بین روش تجدید حجم صددرصد و روش 3P وجود داشت، در حالی‌که این اختلاف برای راش و ممرز، معنی‌‌‌داری نبود. همچنین، آزمون t مستقل نشان داد که برآورد حجم به‌روش 3P در دو حالت بیشترین خطا و کمترین خطا با مقادیر واقعی، تفاوت معنی‌‌داری در سطح اطمینان 95 درصد نداشت. با توجه به نتایج این پژوهش مشخص شد که تجدید حجم به‌روش 3P نسبت به‌روش صددرصد روشی کم‌‌هزینه است و زمان کمتری را می‌‌طلبد.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of 3P and 100% renewal volume methods (Case study: Parchiva forestry plan)

نویسندگان [English]

  • Ramin Mansour Samaei 1
  • Zohreh Khalili Ardali 2
  • Yadollah Resaneh 3
1 Ph.D. Student of Forestry, Faculty of Natural Resources, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
2 Ph.D. Student of Forestry, Faculty of Natural Resources, University of Guilan, Guilan, Iran
3 Expert, Forests, Range and Watershed Management Organization, Tehran, Iran
چکیده [English]

Renewal of wood volume by 3P method has been suggested to replace the 100% renewal method to reduce field work and costs. In this method and following selection of sample trees from marked trees, the volume of industrial trunks and firewood in trees are field-measured. In order to evaluate and compare the full and 3P renewal methods in the Parchiva forestry plan in Mazandaran province, 1184 maple, ironwood, alder, beech and hornbeam were selected. The trees were first measured by 100% renewal method, followed by separate allocation of actual volume to industrial, cordwood and total volumes according to the procedure of 3P method. Estimation of tree volume was done by 3P method in 10 replications. The results of paired samples t-test showed a significant difference between 100% and 3P renewal methods for maple, ironwood and alder, while no significant difference was observed for beech and hornbeam (p < 0.05). An independent samples t-test also showed that volume estimation by 3P method did not reveal any significant difference on maximum and minimum error levels. The results of this study suggested the 3P method as a cost- and time-effective alternative to the full renewal method.

کلیدواژه‌ها [English]

  • Cordwood volume
  • industrial volume
  • Mazandaran province
  • volume renewal method

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