[Effect of marine culture on the quality of coastal water in Guangdong Province in the summer].

The contents of nitrogen, phosphorus and plankton in aquatic areas and non-sea-farming areas, which were found in Shantou, Huiyang, Zhuhai, Yangjiang and Zhanjiang in Guangdong Province respectively, were measured in 2000 in the summer with the aim of estimating the environmental problem of marine culture. The concentration of total nitrogen(TN), particle total nitrogen(PTN), total phosphorus(TP), particle total phosphorus(PTP) in aquatic areas, which were 0.506-1.244 mumol/L, 0.367-1.066 mumol/L, 0.112-0.232 mumol/L and 0.054-0.157 mumol/L respectively, were higher than non-sea-farming areas, but marine culture had no effect on the concentration of dissolvable total nitrogen(DTN) and dissolvable total phosphorus(DTP), TN:TP ratios and DTN:DTP ratios. The most phytoplankton in both aquatic areas and non-sea-farming areas was Chaetoceros, and that of zooplankton was Copepoda (including adult and larva). Marine culture affected the diversity of plankton and the population densities of some species, but not to the number of plankton kinds and the total individuals of all phytoplankton or all zooplankton.