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PHYTOPLANKTON BIOMASS, PRIMARY PRODUCTION AND INFLUENCE OF N/P RATIO ON ALGAL GROWTH AT DAPENG'AO, DAYA BAY, GUANGDONG PROVINCE

The Redfield ratio is usually used to indicate the potential nutrient limitation for phytoplankton growth. Previous data suggested that the N/P ratio in the Dapeng'ao sea area in summer was often lower than 16, and N was the key potential limiting nutrient at the Dapeng'ao in summer. However, the data obtained in summer of 2001 showed that the N/P ratio at that time was much higher than 16. In June 2001, the chlorophyll a content in the surface water of the Dapeng'ao ranged from 2.61 to 19.87 mg·m~(-3), and the primary production ranged from 404.08 to 1097.25 mgC·(m~(2)·d)~(-1). A regress analysis indicated that the biomass or growth of phytoplankton was not controlled by a single factor. In the nutrient addition experiment, faster growth rates were found with additional P, suggesting that P was the potential limiting nutrient in the Dapeng'ao at that time. The growth of phytoplankton under different N/P ratios was investigated. The results showed that the series with a N/P ratio of 30 had the highest biomass and maximum biodiversity. The series with N/P ratios of 16 and 8 also had high biomass and biodiversity. The high stability of dominant phytoplankton species in the series with a N/P ratio of 30 was also found.