Year 2013, Volume 37, Issue 2, Pages 231 - 242 2014-05-18

Effects of adding crown variables in stem taper and volume predictions for black pine
Effects of adding crown variables in stem taper and volume predictions for black pine

Ramazan ÖZÇELİK [1] , Cafer BAL [2]

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Crown characteristics are an important component of growth and yield models. The stem form of a tree depends to a large extent on the tree crown dimensions. However, there is no unified agreement on whether crown variables (crown ratio and crown length) should be incorporated into taper models for accurate predictions of diameter and volume. The purpose of this study was to investigate the level of improvement that the incorporation of crown variables into taper equations for black pine (Pinus nigra J.F.Arnold subsp. pallasiana (Lamb.) Holmboe) gives to diameter and stem volume predictions. Linear and nonlinear crown variable functions were incorporated into a compatible volume and taper equation to evaluate their effect in model prediction accuracy. The inclusion of crown variables provided significantly different parameter estimates but only resulted in a modest reduction of fitting statistics for both diameter and volume with lower average bias and lower mean squared errors for all modified models, although the improvement in stem volume prediction was minimal. Based on the results, the improvement obtained by the inclusion of crown variables is not enough to justify the additional costs in measuring crown variables of standing trees for volume estimation.
Crown characteristics are an important component of growth and yield models. The stem form of a tree depends to a large extent on the tree crown dimensions. However, there is no unified agreement on whether crown variables (crown ratio and crown length) should be incorporated into taper models for accurate predictions of diameter and volume. The purpose of this study was to investigate the level of improvement that the incorporation of crown variables into taper equations for black pine (Pinus nigra J.F.Arnold subsp. pallasiana (Lamb.) Holmboe) gives to diameter and stem volume predictions. Linear and nonlinear crown variable functions were incorporated into a compatible volume and taper equation to evaluate their effect in model prediction accuracy. The inclusion of crown variables provided significantly different parameter estimates but only resulted in a modest reduction of fitting statistics for both diameter and volume with lower average bias and lower mean squared errors for all modified models, although the improvement in stem volume prediction was minimal. Based on the results, the improvement obtained by the inclusion of crown variables is not enough to justify the additional costs in measuring crown variables of standing trees for volume estimation.
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Author: Ramazan ÖZÇELİK

Author: Cafer BAL

Bibtex @ { tbtkagriculture138042, journal = {Turkish Journal of Agriculture and Forestry}, issn = {1300-011X}, eissn = {1303-6173}, address = {TUBITAK}, year = {2014}, volume = {37}, pages = {231 - 242}, doi = {10.3906/sag-1211-67}, title = {Effects of adding crown variables in stem taper and volume predictions for black pine}, key = {cite}, author = {ÖZÇELİK, Ramazan and BAL, Cafer} }
APA ÖZÇELİK, R , BAL, C . (2014). Effects of adding crown variables in stem taper and volume predictions for black pine. Turkish Journal of Agriculture and Forestry, 37 (2), 231-242. DOI: 10.3906/sag-1211-67
MLA ÖZÇELİK, R , BAL, C . "Effects of adding crown variables in stem taper and volume predictions for black pine". Turkish Journal of Agriculture and Forestry 37 (2014): 231-242 <http://dergipark.gov.tr/tbtkagriculture/issue/11580/138042>
Chicago ÖZÇELİK, R , BAL, C . "Effects of adding crown variables in stem taper and volume predictions for black pine". Turkish Journal of Agriculture and Forestry 37 (2014): 231-242
RIS TY - JOUR T1 - Effects of adding crown variables in stem taper and volume predictions for black pine AU - Ramazan ÖZÇELİK , Cafer BAL Y1 - 2014 PY - 2014 N1 - doi: 10.3906/sag-1211-67 DO - 10.3906/sag-1211-67 T2 - Turkish Journal of Agriculture and Forestry JF - Journal JO - JOR SP - 231 EP - 242 VL - 37 IS - 2 SN - 1300-011X-1303-6173 M3 - doi: 10.3906/sag-1211-67 UR - http://dx.doi.org/10.3906/sag-1211-67 Y2 - 2018 ER -
EndNote %0 Turkish Journal of Agriculture and Forestry Effects of adding crown variables in stem taper and volume predictions for black pine %A Ramazan ÖZÇELİK , Cafer BAL %T Effects of adding crown variables in stem taper and volume predictions for black pine %D 2014 %J Turkish Journal of Agriculture and Forestry %P 1300-011X-1303-6173 %V 37 %N 2 %R doi: 10.3906/sag-1211-67 %U 10.3906/sag-1211-67