钱塘江干流杭州段水体叶绿素a浓度及与环境因子的关系

2006年1月至2007年12月,对钱塘江干流杭州段水体的叶绿素a时空分布及其与环境因子的关系进行研究.结果表明钱塘江干流杭州段的叶绿素a浓度时间差异显著,空间差异不显著.叶绿素a浓度呈现夏秋季节高、冬春季节低的规律.叶绿素a浓度与温度呈显著正相关,叶绿素a与透明度在不同范围内表现出不同的相关关系,叶绿素a与TN、TP之间的相关关系在不同江段有所差异.钱塘江干流杭州段总氮和总磷浓度均很高,足够满足藻类生长需要;氮磷比较低,基本在8～30之间,说明氮磷含量可能不是钱塘江藻类生长的限制因子.

Relationships between chlorophyll a and environmental factors of the main stream of the Qiantang River in Hangzhou

The investigations at ten stations were carried out in Qiangtan River from January 2006 to December 200. The spatio-temporal distribution of chlorophyll a and the relationships with environmental factors were studied according to the results of investigations. The results showed that there were obvious temporal differences in chlorophyll a, but not spatial differences. The concentrations of chlorophyll a were high in summer and autumn and low in winter and spring. There was significant positive correlation between chlorophyll a content and temperature. The correlation coefficients between chlorophyll a content and transparency varied in different ranges. The correlation coefficients between chlorophyll a content and TN、TP varied in different river sections. TN and TP concentrations were high enough to meet the needs of algal growth. Low N/P (8 to 30) showed that nitrogen and phosphorus may not be limiting factors for the growth of algae in the Qiangtan River.