Ecoregional height–diameter models for Scots pine in Turkiye

doi:10.1007/s11676-024-01757-z

Abstract

Abstract:

Ecoregion-based height-diameter models were developed in the present study for Scots pine (Pinus sylvestris L.) stands in Turkiye and included several ecological factors derived from a pre-existing ecoregional classification system. The data were obtained from 2831 sample trees in 292 sample plots. Ten generalized height–diameter models were developed, and the best model (HD10) was selected according to statistical criteria. Then, nonlinear mixed-effects modeling was applied to the best model. The R ² for the generalized height‒diameter model (Richards function) modified by Sharma and Parton is 0.951, and the final model included number of trees, dominant height, and diameter at breast height, with a random parameter associated with each ecoregion attached to the inverse of the mean basal area. The full model predictions using the nonlinear mixed-effects model and the reduced model (HD10) predictions were compared using the nonlinear sum of extra squares test, which revealed significant differences between ecoregions; ecoregion-based height–diameter models were thus found to be suitable to use. In addition, using these models in appropriate ecoregions was very important for achieving reliable predictions with low prediction errors.

Key words: Tree height, Nonlinear mixed-effects modelling, Nonlinear sum of extra squares method, Ecoregion, Scots pine

Fadime Sağlam, Oytun Emre Sakici. Ecoregional height–diameter models for Scots pine in Turkiye[J]. JOURNAL OF FORESTRY RESEARCH, 2024, 35(1): 103-.

Fadime Sağlam, Oytun Emre Sakici. [J]. 林业研究(英文版), 2024, 35(1): 103-.

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