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本文研究了南海中部海域(北纬12°0’—19°39’、东经110°30’—118°0’)浮游甲藻类的种类组成与数量分布。发现浮游甲藻类118种,分隶于16科20属。52种为本海区首次记录。其中高温高盐种占89％,广温广盐种占10.20％,低盐近岸种占O.8％。南海中部甲藻细胞总量的季节分布,以12月为最高峰,4月为最低谷期。其数量分布和季节变化与季风、海流、下层高盐水体的涌升及温、密跃层的厚度变化有关。此外,光照强度大,营养盐类贫乏,是造成整个南海中部浮游甲藻数量低下的重要原因。
In this paper, the species composition and abundance distribution of phytoplankton in the central South China Sea (12 ° 0’-19 ° 39’N, 110 ° 30’-118 ° 0E) were studied. 118 species of planktonic dinoflagellates were found, belonging to 16 genera and 20 genera. 52 kinds of sea area for the first time recorded. Among them, 89% are high-temperature and high-salt species, 10.20% are wide-temperature and wide-salt species, and O.8% are from low-salt nearshore species. The seasonal distribution of dinoflagellate cells in the central South China Sea is the highest in December and the lowest in April. The distribution of numbers and seasonal variations are related to the monsoon, ocean currents, the rising of high salinity water bodies in the lower layer and the changes of the thickness of the warm and tight layers. In addition, the light intensity, lack of nutrients, is caused by the central South China Sea a small number of algae plankton low the important reason.