Abstract: Using box-counting dimension method, this paper investigated the spatial occupation ability of different branching patterns related to the fate of Larix chinensis apex buds. The results showed that typeⅠbranching was beneficial to the branches to extend their spatial occupation, typeⅡbranching was beneficial to spread their areas, and type Ⅲ branching was beneficial both to extend their spatial occupation and to spread their areas. As a whole, the death of apex buds could help branches to improve their spatial occupation ability and energy utilization efficiency, and play an important role in adjusting crown type, and hence, in improving its photosynthesis. The death of Larix chinensis apex buds was probably a compelled result of their rigorous living conditions.

Key words: Diatom, Species composition, Ecological distribution, Changjiang River estuary