枸杞岛海域浮游植物群落结构分析

根据枸杞岛海域全年调查中9月份尖刺菱形藻爆发式繁殖的情况，环岛4种生境中设置7个站点对浮游植物进行群落结构分析。9月枸杞岛海域浮游植物丰度很大，在7.6×10⁶~37.2×10⁶/m³之间，尖刺菱形藻占总丰度的71.6%，处于绝对的优势。而在沙滩生境中，中肋骨条藻为次优势种之一，在其他生境类型的站点中生物量不多。结合环境因子，构建物种—环境因子矩阵，进行典范对应分析（CCA）。得出倾角，叶绿素，溶解氧，盐度，光量子，温度为浮游植物群落的主要影响因子（P<0.01）。中肋骨条藻受温度影响较大，在温度相对较高的水域大量存在。结合全年的群落物种和环境数据，得出尖刺菱形藻的生长繁殖主要受温度影响。

The community structure of phytoplankton in Gouqi Island

Depending on the bloom of Pseudo nitzschia pungens in Gouqi Island in September, seven stations in four habitats around Gouqi Island were set up to analyze the community structure of phytoplankton. The abundance of phytoplankton in September is between 7.6 and 37.2 (×10⁶/m³), Pseudo nitzschia pungens dominated in the whole abundance which is 71.6 percent. Skeletonema costatum was one of the dominant species in the habitat of sandy beach compared with the small amount in other habitats. Combining with the environmental factors, the species environment matrix was established to do canonical correspondence analysis. The results showed that angle, Chl Flu, DO, salinity, P.quantum and temperature were the main factors affecting the structure of phytoplankton community (P<0.01). Skeletonema costatum was primarily influenced by temperature, so there was large abundance in the high temperature areas. According to the all year data of species and environment, Pseudo nitzschia pungens was primarily influenced by temperature.