太湖典型湖区中胶体有机碳浓度的时空变化

利用切向流超滤技术研究了太湖梅梁湾与贡湖湾2个不同生态类型的典型湖区在不同季节胶体有机碳(COC)的浓度变化,并同步观测了浮游植物、叶绿素(Chla)、悬浮物(SS)等背景指标.结果表明,作为藻型湖区的梅梁湾,其COC浓度夏季最高,秋季最低;作为草型湖区的贡湖湾.其COC浓度在秋季最高,冬季最低;太湖梅梁湾和贡湖湾COC浓度的差异和季节变化有关,夏季梅梁湾COC浓度高于贡湖湾,差异为一年中最大;太湖水体COC浓度和Chla浓度显著正相关(r=0.81,P=0.015),表明浮游植物的生命活动址太湖水体COC的一个重要来源.

Temporal and spatial changes of the content of colloidal organic carbon in Taihu Lake,China

In two different ecological zones of Taihu Lake-Meiliang Bay and Gonghu Bay-the content of colloidal organic carbon (COC) in different seasons was monitored using cross-flow ultrafiltration. Related water quality variables such as phytoplankton community,chlorophyll a (Chla) and suspended solids (SS) were also observed. The COC content in Meiliang Bay,an algae type zone of Taihu Lake,were the highest in summer and the lowest in autumn. But the COC content in Gonghu Bay,a grass type zone of Taihu Lake,were the highest in autumn and the lowest in winter. The differences in COC contents between the two lake zones changed with the seasons. Of the four seasons,the difference in summer was the most significant. The results also showed that concentrations of COC were significantly positively correlated with concentrations of Chla (r=0.81,p=0.015),which meant that primary productivity of phytoplankton was a key source influencing COC in Taihu Lake.