太湖梅梁湾冬末春初浮游动物时空变化及其环境意义

The Zooplankton Distribution During Winter and Early Spring and Its Environmental Effects in Meiliang Bay, Taihu Lake

根据1998年2－3月完成的太湖梅梁湾地区水环境综合调查，对有关浮游动物时空情况进行了分析，这次调查共设7个点（湾口5个，湾内2个）．湾口上的J2、J4与湾内的J6、J7均是分5层采样，共分无风（2月26日）、小风（2月24日）和大风（3月11日）3次天气过程，每次过程采集2到3次样品与记录，结果显示，太湖梅梁湾地区浮游生物中枝角类和桡足类的生物量与水温变化关系密切，水温越高，生物量越高；温度相同时，其生物量与透明度呈正比，在空间上，浮游生物生物量在湾内（上风口）高于湾口（下风口）；在垂直方向上，2月24日与26日二次风较小的情况多分布于二层、三层，但3月11日大风过程中其垂直分布较为均匀．

From February to March in 1998, 7 sampling stations were fixed in Meiling Bay, Taihu Lake for the aquatic environmental investigation. Five of them (F1, J2, F3, J4, F5) were located on the mouth of the bay, the other two inside of the bay. The zooplankton samples wcre collected twice to three times on February 24, a gentle breeze day, on February 26, a calm day and on March 11, a strong windy day. There were 5 sampling layers in J2, J4, J6 and J7. The dominant direction of wind was north during the sampling days. Based on the samples analyses, it shows that the zooplankton abundance of cladocera and copepoda in the bay has close relationship with the water temperature. The higher water temperature, the higher abundance and there exists linear corelation between the abundance and the secchidisc transparency at the same water temperature. For the horizontal distribution of zooplankton, the zooplankton abundance inside the bay is higher than it on the mouth. For the vertical zooplankton distribution, the majority is at the 2nd and 3rd layers under the condition of February 24 and 26 but the uniform distribution under strong wind condition of March 11.