白洋淀叶绿素a及其水质因子分析

CHLOROPHYLL-A AND ANALYSIS OF WATER QUALITY OF LAKE BAIYANGDIAN

从2009年5月到2010年3月,选择代表月份对白洋淀水体中叶绿素a浓度的时空分布进行了调查并分析了白洋淀的水质特征。结果表明,白洋淀叶绿素a有明显的时空分布规律:夏季(平均含量为41.19mg/m3)>秋季(平均含量为40.42mg/m3)>春季(平均含量为16.95mg/m3)>冬季(平均含量为10.30mg/m3);空间方面,清洁对照点最低(年平均值为10.65mg/m3),养鱼点含量最高(年平均值为42.11mg/m3)。叶绿素a的含量变化范围是4.37～97.45mg/m3,表明白洋淀处于富营养化水平。叶绿素a的含量与其他水质因子呈现一定的相关性:与水温、透明度、总铁、总磷之间有较高的相关性,与CODMn之间相关程度显著,与总氮相关程度较小。

The total iron and its species were determined in Lake Baiyangdian from May 2009 to March 2010. Water quality was monitored at the same time. It showed that the content of Chl-a appeared obvious temporal and spatial distribution characteristics, the contents of Chl- a reduced in the order of summer （41.19 mg/m3）〉autumn （40.42 mg/m3）〉spring （16.95 mg/m3）〉winter （10.30 mg/m3）. The lowest concentration of iron was in the clean con- trolled site （10. 65 mg/m3）. The highest concentration of iron was in fish breeding zone （10.65 mg/m3）. The content of Chl-a ranged from 4.37 mg/m3 to 97.45 mg/m3 , showed the state of eutrophication in Lake Baiyangdian. Chl-a was significant correlation with T, SD, total iron, and TP, normal correlation with CODMn, while almost no correlation withtotal nitrogen.