Study On The Growth Yield Models And Simulation Of Larix Olgensis Plantation In Mountainous Regions Of Eastern Liaoning Province, China

Larix olgensis is one of the important planting in Northeast regin of China, by collecting113samples and66different age of stand trees in mountainous regions of eastern Liaoning Province China, growing process was studied by stem analysis, using stepwise regression method fitted the DBH growth model, height growth model, DBH-height model, canopy width model, crown ratio model and volume model. Various models passed the t-test, the residuals followed the normal distribution, models fitted well. In this study, growth models were embedded in forest vegetation simulator, testedt the accuracy of the system, and simulated the growth situation under different thinning intensity, aimed to provide a reference for plantation management, and laid the foundation for establishment of the nationwide forest growth model (C-FVS). The results of above show as follows:(1) Forms and coefficients of DBH growth model, height growth model, DBH-H model, crown width model, crown ratio model and single tree volume model were shown in the table1.(2) The maximum of current annual increment of DBH at7a, the maximum of average growth at16a, the two curves intersected at17a-20a; the peak of current annual increment of Height at6a, the peak of average growth at13a, the current annual increment intersect with the average growth at the age of12a-14a. At the early age, Larix olgensis starts to grow slowly in volume, after30years the volume grows fast, while it doesn’t achieve the number of mature forest until the age of56, it means Larix olgensis timber volume grows slowly.(3) After embedding growth models in FVS system, simulated the natural growth process of different densities and growth process under different thinning intensities, and that30%to60%of management densities for olgensis were reasonable.