Simulation of Height-diameter Relationships for Larix gmelinii Based on Mixed Effects Research on Nonlinear Height-diameter Models Height-Diameter Relationship for Conifer Mixed Forest Based on Nonlinear Mixed-Effects Model Generalized Height-Diameter Models for Three Main Coniferous Trees Species in Changbai Mountain Ecoregion based Height-diameter Models for Larix gmelinii Rupr. in Daxing’an Mountains Studies on Stability for Parameters in Height-diameter Curve of Chinese Fir Height-Diameter Model for Major Tree Species in China Using the Classified Height Method