Abstract: In order to understand the variation patterns of Pennisetum purpureum ramets modular growth and biomass allocation under conditions of cultivation, an analysis was made on the modular biomass of P. purpureum cv. Huanan ramets measured in June and December 2009. During the growth process of the ramets, the leaf biomass increased in linear pattern, with the determination coefficient R² ranged from 0.209 to 0.784, and the culm biomass increased in linear or power pattern, with the R² ranged from 0.687 to 0.989, suggesting that the increasing pattern of the culm biomass was much steadier than that of the leaf biomass. With the increase of ramet total biomass, the increasing rate of the leaf biomass in vegetative period was 3.39 times of that in reproductive period. However, the increasing rate of the culm biomass in reproductive period was 1.13 times of that in vegetative period. In reproductive period, the dead leaf biomass increased steadily in a linear pattern, with the determination coefficient R² ranged from 0.471 to 0.676. The correlation models of the inflorescence biomass were all non-significant (P>0.05), and the allocation ratio of the inflorescence biomass decreased in a power pattern, with a power value of  -1.037. The allocation ratios of the leaf  and culm biomass in reproductive period changed in power pattern, with the power values of -0.387 and 0.091, respectively.

Key words: Acipenser schrenckii, Specific growth rate, Growth efficiency, Feed conversion rate, Aquaculture