Age Structure and Growth Pattern of an Endangered Species, Amentotaxus formosana Li Weibull D. B. H. Distributions and Their Dynamic Predictions in the Natural Uneven-Aged Evergreen Broad-leaf Juvenile Forest Simulation of diameter distribution of Pinus sylvestris var. mongolica plantations on sandy soil Growth and Mortality of Size-class Model for Spruce-Fir Mixed Forests in Over-cutting Forest Area of Changbai Mountains, Northeast China