Abstract
为了解珠江流域东江干流水体叶绿素a的时空分布及与环境因子的关系,于2012年6月(丰水期)和12月(枯水期)对东江干流进行采样调查分析.结果表明,东江水体叶绿素a含量具有明显的时空分布特征,其全年变化范围为0.84~14.93μg/L,整体均值为3.60±2.45μg/L,丰水期叶绿素a含量显著高于枯水期;而丰、枯水期叶绿素a含量空间分布特征相似,上游河段显著低于下游河段.相关性与主成分分析结果显示,水体中总氮浓度、总磷浓度、有机物含量、水温和水流流速等都是影响东江浮游植物生长的重要因素,其中以总磷的影响最为显著,表明磷可能是东江浮游植物生长的限制因子.;Sampling was carried out in wet season and dry season of 2012 in order to analyze the distribution of chlorophyll-a and the effects of water environment factors on chlorophyll-a in Dongjiang River, Pearl River basin. Results showed chlorophyll-a concentration appeared strong temporal and spatial variations in Dongjiang River, ranging from 0.84 to 14.93μg/L, and with the annual mean value of 3.60±2.45μg/L. The chlorophyll-a concentration in wet season was obviously higher than that in dry season. For wet and dry season, the temporal distribution of chlorophyll-a had a similar pattern, increasing from upstream to downstream. The correlation analysis and principal components analysis indicated TN, TP, COD<sub>Mn</sub>, water temperature and flow velocity were the most important factors for the growth of phytoplankton in Dongjiang River, and phosphorous might be the limiting factor because of its remarkable influence on phytoplankton.
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