7Manuel C., Molles, Jr. Ecology, Concepts and Applications[M].2nd ed.. McGraw-Hill Companies, New York.2002, 186-437.
8Kohyama T. Simulating stationary size distribution of trees in rain forests[J]. Annals of Botany. 1991, 68: 173-180.
9Frost I, Rydin H. Spatial pattern and size distribution of the animal-dispersed tree Quercus robur in two spruce-dominated forests[J]. Ecoscience. 2000, 7: 38-44.
10Hett J M, Loucks O L. Age structure models of balsam fir and eastern hemlock[J]. Journal of Ecology. 1976, 64: 1029-1044.
