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Ecoregional height-diameter models for Scots pine in Turkiye
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Ecoregional height-diameter models for Scots pine in Turkiye
Ecoregion-based height-diameter models were developed in the present study for Scots pine(Pinus sylves-tris 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 R2 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 ecore-gions;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.
Tree heightNonlinear mixed-effects modellingNonlinear sum of extra squares methodEcoregionScots pine
Fadime Sa?lam、Oytun Emre Sakici、Tao Xu
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Department of Forest Engineering,Faculty of Forestry,Kastamonu University,37150 Kastamonu,Turkey
Tree height Nonlinear mixed-effects modelling Nonlinear sum of extra squares method Ecoregion Scots pine
万方数据
维普
