| In recent years, with the rapid development of coastal industries and aquaculture, eutrophication became serious problems in the area that nearby Changjiang (Yangtze) River Estuary, Hangzhou Bay and the Zhoushan fishery area. With marine environment worsened, these areas were often suffered from HAB damages, so they were called high frequency HAB occurrence areas in East China Sea (ECS). The dominating species of HAB which occurred from April to May is Prorocentrum Donghaiense. In order to understand that P. Donghaiense form high biomass blooms under natural condition, many important physiological theories were raised, particularly with respect to light adaptation. According to the result got from former research , based on in-situ light-dependent batch culture which were carried out from March to June in 2005 in the ECS, this paper discussed the characteristics of phytoplankton growth and the dissolved nutrient absorption and the succession of phytoplankton under the conditions of controlled solar radiation. The results were shown as follows:1. The effect of solar radiation on the growth of phytoplankton in springTo study the effect of solar radiation on the growth of phytoplankton, in-situ light dependent batch culture was carried out in the ECS. The results showed that in a certain extent of light, increasing light intensity accelerates the growth of phytoplankton; when light increased continually, the growth of phytoplankton was restrained to some extent. The intensity of light influenced the arrearage period of phytoplankton growth. In addition, the relationship of light and the final biomass showed that optimal growth light of phytoplankton in near shore stations was lower than that in off shore stations. When temperature rose, off shore optimal growth light increased, but the change in near shore optimal growth light was not obvious, this was due to the different community of phytoplankton.
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