Study On Tree Toleration In The Forests In The East Of Liaoning Province

The natural secondary forest in the mountainous area of eastern Liaoning province is a precious forest resource of Liaoning and a natural barrier for the city groups in middle Liaoning.It is very important for the economic development and ecological construction of Liaoning.The main species of the natural secondary forest in the mountainous area of eastern Liaoning was studied.They are: Pinus koraiensis, Picea koraiensis, Quercus mongolica, Fraxinus mandshurica, Fraxinus rhynchophylla, Phellodendron amurense Rupr and Tilia amurensis Rupr. Under natural conditions, their seedlings were planted,and the shade-tolerance of them were measured. Physiological indices such as growth, physiology, biochemistry of these 7 species under different illumination conditions were observed.The effect of the changing illumination conditions on the growth increment of these 7 species were studied, and the relationship between the growth and effective photosynthetic radiant was quantified. The adaptation mode of these 7 species in growth and shape and the relationship between them and the environment were studied with multivariate statistical analysis. The mathematic model on the photosynthesis velocity and effective photosynthetic radiant intensity was used to simulate the influence of changing radiant intensity on the photosynthetic character of seedlings. This provides a clue and dependable evidence for explaining the plants, light adaptation strategy. The survival, growth and adaptation mechanism of these species under different illumination conditions were also discussed, which provides a scientific and detailed instruction on how to manage the natural secondary forest and how to accelerate the planted forest into wild wood.