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\hypersetup{pdftitle={Evaluating the Precision of Growing Stock Estimation and Determination of Industrial \& Fuel Wood Volumes of Beech Trees in West of Guilan Province (IRAN)},pdfauthor={Iraj Hassanzad Navroodi},pdfsubject={Tropentag 2010: Abstract},pdfkeywords={Beech, dbh, fuel wood volume, industrial volume, volume model},pdfpagemode=None,colorlinks=true}
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\parbox[b]{13.4cm}{\centering \large{\textbf{Tropentag, September 14-16, 2010, Zurich}}\\[1ex] \Large{``World Food System  ---\\A Contribution from Europe''\\[2ex]}}
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\Large{\textbf{Evaluating the Precision of Growing Stock Estimation and Determination of Industrial \& Fuel Wood Volumes of Beech Trees in West of Guilan Province (IRAN)\footnote{\textbf{Contact Address:} Iraj Hassanzad Navroodi, University of Guilan, Department of Forestry, P.O. Box 1144, Sowmeh Sara, Iran, \mbox{e-mail}: \email{irzad2002@yahoo.com}}\\[0.8ex]}}
\normalsize{\textsc{Iraj Hassanzad Navroodi}}
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\begin{itemize*}
\item[]{\small{\textit{University of Guilan, Department of Forestry, Iran}}}
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\index[author]{Hassanzad Navroodi, Iraj}
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\textbf{Abstract}
\begin{abstract}
\normalsize{
Study area located in district 5 of Shanderman (watershed 11 from division of watersheds in northern forest of Iran). In order to survey the precision of growing stock estimation and determination of industrial and fuel wood volumes of beech trees and in order to create a feasible model between diameter and determining industrial and fuel wood volume percentage in this District, 10 percent of the annual marked trees for logging were selected randomly in five parcels of District 5. After measuring of diameter at breast height (DBH) and estimating the volume by the use of Tarif table and cutting trees, the volumes of the industrial woods of trees were computed by using Huber's formula. The volume of fuel woods with diameter up to \mbox{12\,cm} also were calculated by Huber's method and the diameter below \mbox{12\,cm} were calculated as ester. The results showed that there were no significant differences between estimation of volume"=by-volume table (Tarif table) and calculated volume after cutting at 0.01 levels. The suitable model for relationship between DBH and total volume among other fit models (such as linear, logarithm and exponential models) after evaluating the validity of models was a parabolic model V = 0.002d\textsuperscript{2} --- 0.0844d --- 1.5786 \& r = 0.99.  



Percent of industrial and fuel wood volume of beech trees were \mbox{68.9\,\%} and \mbox{31.1\,\%} in the study area, respectively and at \mbox{95\,\%} confidential limit, the real mean industrial volume of Beech trees to total volume is between \mbox{61.1\,\%} \& \mbox{76.7\,\%} and fuel wood volume between \mbox{26.49\,\%} \& \mbox{35.71\,\%}.     



}

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\noindent \textbf{Keywords:} Beech, dbh, fuel wood volume, industrial volume, volume model
\index[key]{Beech}
\index[key]{Fuel wood!volume}
\index[key]{Industrial wood}
\index[key]{Wood!industrial}
\index[key]{Wood!fuel}
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