千岛湖叶绿素a浓度动态变化及其影响因素分析

通过对千岛湖各常规监测点1999～2000年叶绿素a含量及水质理化指标的逐月监测,分析了千岛湖叶绿素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氮、磷、水温、透明度和降水等,这些生态因子对叶绿素a含量有着直接和间接的影响,但不同区域各影响因子所起的作用不同.

Analysis of the spatial and temporal changes in chlorophyll-a concentration in Qiandao Lake and its impact factors

The chlorophyll-a and other water quality indexes were investigated once a month from 1999 to 2000. The spatial and temporal changes in chlorophyll-a concentration in Qiandao Lake were analyzed and the impacts of ecological factors on chlorophyll-a were discussed in the paper. The results showed that the seasonal change of chlorophyll-a concentration was not prominent in the centre and in the outflow of the lake. But it was obvious in the riverine zone and lakefront zone which was evidently influenced by human's activities. Moreover, the concentrations of chlorophyll-a were comparatively high in the riverine zone and lakefront zone. Ecological factors, including nitrogen, phosphorus, water temperature, transparency and precipitation, had significant impact on the concentrations of chlorophyll-a directly and indirectly. However, the main factors were different in different regions of Qiandao Lake.