九龙江西溪漳州段浮游植物组成与环境因子的关系

分别在2010年的丰、平、枯3个时期,从浮游植物种类组成、生物量(叶绿素a含量)及其粒级结构等指标对九龙江漳州段浮游植物组成进行了调查,同时分析了其与环境因子间的关系,评估了该河段的水质质量。结果表明:研究区域微微型浮游植物占总生物量比例与温度存在显著的正相关性(P<0.05),小型浮游植物占总生物量比例与总氮成显著的负相关(P<0.05)。共鉴定出浮游植物7门59种,且在各时期均有差异;丰水期与枯水期相比,蓝藻比例上升(P<0.05),甲藻比例下降(P<0.05);研究水域Shannon-Wiener指数在1.0～3.0,为中度污染。典型对应分析表明,温度和营养盐是影响九龙江西溪漳州段浮游植物群落变化的主要环境因子。

Phytoplankton composition and its relationships with environmental factors at Zhangzhou section of western Jiulong River

From the viewpoints of species composition and biomass (size-fractionated chlorophyll a), an investigation was conducted on the phytoplankton composition at Zhangzhou section of Western Jiulong River during wet, normal, and dry seasons in 2010, with the relationships between the phytoplankton composition and environmental factors analyzed and the water quality assessed. In the study area, the proportion of picoplankton biomass to the total phytoplankton biomass had significant positive correlation with water temperature (P<0.05), and the proportion of micro-phytoplankton biomass to the total biomass had negative correlation with water total nitrogen (P<0.05). A total of 59 species belonging to 7 phyla were identified. The phytoplankton species composition and abundance varied with seasons and sites. In wet season, the proportion of Cyanobacteria increased (P<0.05), while that of Dinoflagellates decreased (P<0.05), as compared with those in dry season. Canonical correspondence analysis showed that water temperature and nutrients contents were the main environmental factors affecting the phytoplankton community composition and biomass at the Zhangzhou section of western Jiulong River.