Different Culture Conditions on Rapid Propagation of Phellodendron amurense Response of Alkaloids Content of Nature Phellodendron amurense from Different Vegetation Areas to Seasonal Change Population Survival Status and Chemical Characterization of Wild Phellodendron amurense Rupr. in China Survey of basic living conditions and protective measure on Pheliodendron amurense in Changbai Mountain Inhibitory activity of substance in seed and sarcocarp of Phellodendron amurense The variation regularity on seedling growth of Phellodendron amurense in different germplasm resources and families