| Based on the survey of KC2007-3 and algae cultivation experiment, the effects of allelopathy on the succession of the Red-tide in the East China Sea in 2007 were studied. Effects of exogenous polyamines and red-tide seawater filtration on growth of Prorocentrum donghaiense, Alexandrium tamarense and Skeletonema costatum were studied, and the distributing and variation characteristics of dissolved organic during the Red Tide were also discussed.Putrescine, spermine and spermidine were added to cultivation of P. donghaiense, A. tamarense and S. costatum respectively. Low concentration polyamines promoted P. donghaiense, A. tamarense more than S. costatum, which indicated that polyamines might advance the succession from diatom bloom to dinoflagellate bloom.The effect of cultivation with the seawater filtration in different phases of the red-tide was consistent with the process of succession of the red-tide in the East China Sea, which suggested allelochemical in seawater might play a part role in the succession of the red-tide.High tyrosine-like intensity was observed in diatom red tide dispersion area. High FIB/FIS showed that diatom bloom produced much tyrosine-like matter during dispersion. Peak S, peak A and peak C had positive correlation with one another, and their distributions were similar, which decreased with distance increasing away from the shore. Good negative correlations between peak S, peak A and peak C with salinity, which suggested that Jiangsu-Zhejiang Coastal Water was the same source of them.MCHO, PCHO, TCHO and DOC seemed to have something to do with phytoplankton in the euphotic zone, but did not have remarkable correlation with Chla. High concentration carbohydrate and DOC might derive from the secretion or decomposition of the diatom bloom.The intensity of protein-like fluorescence matter had reverse trend to the density of pico-flagellates, which suggested that those matter might act as nutrient resource or stimulative to pico-flagallates.
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