Study on Newton Iteration Method of Sketch and Tension of Suspension Rope STUDY OF THE APPLICATION OF NONLINEAR REGRESSION ANALYSIS TO EVALUATE SITE QUALITY AND TO PRIDICT TREE HEIGHT A STUDY ON THE SITE QUALITY EVALUATION BY THE SUBSTITUTION OF TREE SPECIES IN THE SAME SITE TYPES A STANDARD VOLUME YIELDING MODEL OF CHINESE FIR USED FOR SITE QUALITY EVALUATION A STUDY ON THE ESTABLISHMENT OF POLYMORPHIC SITE INDEX MODEL BY ADOPTING RICHARDS FUNCTION Height-Diameter Model for Major Tree Species in China Using the Classified Height Method