广东沿海与粤北山区中小型水库浮游生物群落比较分析

于丰水期和枯水期对广东山区水库(赤石迳水库)、沿海水库(大水桥、赤沙水库)三个水库的湖泊区和河流区进行研究,分析水质和浮游生物群落结构。三个水库之间的浮游生物群落均有所区别,地理位置和地形不同而引起的温度差异以及外源性营养盐输入是造成浮游生物种类和数量差异的主要原因。沿海水库不分层,而山区水库丰水期温跃层明显。各水库的氮磷比均较高,ｃｈｌ．ａ水平主要受磷限制,沿海水库则多喜暖性的种类,如裸藻、隐藻、沙居剑水蚤等,山区水库发现较多喜冷性浮游生物,如金藻、透明溞等,丰水期的甲藻丰度也相对高于枯水期。

Comparative analysis of plankton connnunity between the coastal and mountain reservoirs in Guangdong province

Two coastal reservoirs (Chisha reservoir and Dashuiqiao reservoir) and one mountain reservoir (Chishijing reservoir) in Guangdong Province were sampled in flood and dry reasons of 2000 and their plankton communities were analyzed. The composition and abundance of plankton are different in the reservoirs. The main causing factors are nutrient input and temperature. The measurements show that N/P ratios in the three reservoirs were higher than 15, phytoplankton growth was limited by phosphorus concentration. In flood season, thermal stratification was not found in coastal reservoirs, but it was obvious in the mountain reservoir. More psychrophilic plankton appeared in Chishijing reservoir, such as Ochmmonas mutabilis, Daphnia hyalina. The cell abundance of Pyrrophyta in summer is higher than in winter. Thermophilic plankton more frequently presented in the coastal reservoirs, for examples, Euglena viridis, Phacus sp. Cryptomonas sp. Psammophilocyclops so. was only found in warm areas of Dashuiqiao reservoir.