千岛湖水体叶绿素a时空变化特征及其影响因子分析

1999-2000两个水文年度对千岛湖水域12个监测点叶绿素a含量及水质理化指标的逐月监测,分析了千岛湖水体叶绿素a含量的时空变化特征及影响因子.结果表明,千岛湖叶绿素a含量在湖心区和出水区随季节变化不明显,但受周边人类活动影响较大的河流区和湖边区随季节变化明显,其含量明显高于湖心区和出水区.影响千岛湖叶绿素a含量变化的主要因子有营养盐、水温和降水等,这些生态因子对叶绿素a含量有着直接和间接的影响,但在不同湖区各影响因子所起的作用有所不同.

Analysis of the Chlorophyll-a Dynamics of Phytoplankton in Qiandao Lake and Its Influence Factors

The chlorophyll-a content and the physical and chemical indexes of water quality in Qiandao Lake were monitored monthly from 1999 to 2000 at 12 points. The characteristics of the spatial and temporal changes of chlorophyll-a content and its influence factors in Qiandao Lake were analyzed. The result shows that the seasonal change of chlorophyll-a content in the central and outflow zones of the lake is not prominent, but that in the riverine and lakefront zones, which are influenced by human activi- ties, is. The chlorophyll-a content there is obviously higher than that in the central and outflow zones. The main factors influencing the change of chlorophyll-a content in Qiandao Lake include nutrient salt, water temperature and precipitation, etc. These ecological factors exert direct and indirect influence upon chlorophyll-a content, but the factors play different roles in different zones of Qiandao Lake.