INHIBITORY EFFECT AND SINKING BEHAVIOUR OF WOOD MEALS FROM CHINA FIR ON ALEXANDRIUM TAMARENSE IN CULTURES

In recent years,there had been an apparent increase in the occurrence of harmful algal blooms (HABs) throughout the world. Many researchers focused on the methods to control HABs,and many approaches had been found,but seldom be applied in practice. The method to control HABs,which was economical,effective and friendly to environment,was prerequisite and the exploration of such method was getting a spotlight in HABs field. In this paper,effects of the wood meals from China fir on the growth of Alexandrium tamarense were assessed in laboratory. The inhibitory effect of the extracts from fir wood meals and sinking behaviour of the wood meals on microalga was observed,and possible mechanism was put forward. The results showed that fir wood meals whether autoclaved or not had negative impact on A. tamarense. The growth of A. tamarense was inhibited by 0.04% w/v of fir wood meals,with the cell density some 20-fold lower than the control. In addition,the extracts containing polyphenols from fir wood meal was found to inhibit the growth of A. tamarense. Sinking action of fir wood meals on microalga did occurred. These results suggested that fir wood meals may be a potential candidate for HABs control. Some algicidal bioactive substances such as polyphenols and sinking action of fir wood meals were responsible for that.