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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