Abstract
Volume equations are used to predict the content of stems of standing trees as a function of easily measured tree attributes such as diameter at breast height and tree height. Various functions have been proposed for predicting volume of a specified portion of the bole from stump height to a fixed top limit. Unconstrained, independent equations may not exhibit consistency among estimates to varying merchantability limits. Consequently, equations to predict the ratio of merchantable stem volume to total stem volume have been developed. By placing restrictions on the values the ratio equation can assume, consistent estimates of volume of specified portions of the bole are assured. A detailed example of fitting compatible stem volume and taper functions is presented. In addition, information is provided on inclusion of predictor variables in addition to tree diameter and height and on stem quality assessment and prediction.
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Notes
- 1.
For species that can be regenerated by coppice (such as eucalyptus), multiple stems from each stool may be kept until the next harvest. In such cases, each stem is usually treated as an individual excurrent tree but with height to dbh being measured from the top of the stool.
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Burkhart, H.E., Tomé, M. (2012). Tree-Stem Volume Equations. In: Modeling Forest Trees and Stands. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-3170-9_3
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DOI: https://doi.org/10.1007/978-90-481-3170-9_3
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