Abstract: Through the measurement of algal cell density, this paper evaluated the allelopathic inhibitory effects of different concentration (0.5, 1.0, and 2.0 g·L^-1) aqueous extracts from the fresh leaves of mangrove plant Kandelia candel on Phaeocystis globosa and Heterosigma akashiwo. The impacts of heat treatment on the allelopathic effects of the extracts were also examined. The leaf extracts of K. candel had significant inhibitory effects on the two microalgae, and the effects were concentration-dependent. In five days, the maximum inhibitory rates of the extracts at 2.0 g·L^-1 on P. globosa and H. akashiwo were 91.6% and 77.0%, respectively. P. globosa and H. akashiwo had different sensitivity to the extracts. The inhibitory effect of the extracts was stronger on P. globosa than on H. akashiwo. Heat treatment decreased the inhibitory effects of the extracts significantly (P<0.05). The extracts damaged the cell membrane of the microalgae, making their cells expanded and broken.

Key words: Greater Xing’an Mountains, burned area, restoration, carbon storage.