Study on Relationship Among Leaf Area Index,Biomass and Growth Factors of the Artificial Forest of Pinus tabulaeformis

The relationship among the leaf area indexes and its biomass and growth factors were studied in the 30-year-old artificial forest of Pinus tabulaeformis in Daqing Mountains in Inner Mongolia.The results showed that the leaf area of different ages was positively correlated with its biomass and the relationship between the leaf area index of Pinus tabulaeformis and its biomass in unit area could be expressed by the equation y=k-aEXP(-bx).In the whole growth season,the range of leaf area index was 10.75～16.19 when the leaf biomass reached the maximum.The relationship between the leaf area of leaves in different ages of Pinus tabulaeformis individual and the total leaf area could be expressed by the equation y=aEXP(-bx^k).The relationship between the leaf area index and the diameter of the stand was simulated by the model: y=aEXP(-b/x^k)(x is the average diameter of stand,y is the leaf area index),and the simulating result was the best according to comparing with others.Meanwhile the leaf area index decreased with the increase of the diameter of the stand gradually and finally reached stabilization.