Current issue: 58(1)

Under compilation: 58(2)

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Articles containing the keyword 'formula'

Category : Article

article id 7208, category Article
T. Heikkilä. (1927). On examining the cross-sectional area of a stem. Acta Forestalia Fennica vol. 32 no. 3 article id 7208. https://doi.org/10.14214/aff.7208
Keywords: cross-sectional area; stem; formula
Abstract | View details | Full text in PDF | Author Info

Because the cross-sectional area of a tree stem is ellipsis, it cannot be determined exactly with only the diameter measurement.  The article presents a formula and the calculation of the exact cross-sectional area. If the cross-sectional area is calculated as arithmetic mean of two diameter measurement, varies the error between two limit values. The error becomes smallest by calculating the area based on the biggest and the smallest diameter measurements. 

  • Heikkilä, E-mail: th@mm.unknown (email)
article id 7204, category Article
Erik Lönnroth. (1927). On volume formulas. Acta Forestalia Fennica vol. 31 no. 5 article id 7204. https://doi.org/10.14214/aff.7204
Keywords: stem volume; methodology; measuring; formula
Abstract | View details | Full text in PDF | Author Info

Volume formulas have been developed already for long time but there are still some questions to be solved. The volume of a stem can be calculated based on measurements of diameter on various heights or based on mathematic formula. The article presents the formula development for that. The study is based on measurements of 24 pine stands.   

The results of the new formula can be seen satisfactory with the relatively small data of this study. Coincidentally the formally best mean solution of the here compared volume calculation formulas was the one based on Denzin’s formula. There the deviation from total mean is almost zero.   

  • Lönnroth, E-mail: el@mm.unknown (email)

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