Tree Height-DBH Growth Model of Picea schrenkiana in Tianshan Mountains of Xinjiang
In order to further study the growth model between DBH and tree height of Picea schernkiana in Xinjiang,fill the gap in related research,and provide a useful reference for the growth prediction and production and management of P.schernkiana stand.In this paper,30 quadrats,each with a size of 25 m×25 m,were used to construct the tree height-DBH growth model of Tianshan spruce by selecting 34 kinds of growth equations,and it was found that the Logistic H2 model H=1.3+a/(l+b-1D-c)and the Mixed model H=1.3+a/(1+b-1D-c)had the best fitting effect.The adjus-ted R2 was 0.862 m,the RMSE was 4.768 m,the MAE was 3.625 m,and the SSE was 10,839.76 m.In addition,a nonlin-ear mixed-effect model was constructed by adding the most random effects of altitude and slope in this study,and com-pared with AIC,BIC and log-likelihood values,it was found that the nonlinear mixed-effect model based on altitude had better than effect and higher prediction accuracy.
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