| 摘要: |
| 叶绿素（Chl）是水体初级生产的重要指标，随环境因素变化而波动，因此，周年持续的原位实时监测可以更准确地反映水体初级生产水平及受控因素。作者于2017年全年通过水质自动在线监测对厦门港海域的叶绿素及水温、溶解氧、pH、盐度等水环境因子进行了实时监测分析，并基于多元分析研究了叶绿素含量时空分布与主要水环境因子之间的相关性。结果表明，厦门港叶绿素含量年平均值为（3.89±7.76）mg/m3，最大值为163.00 mg/m3，出现在同安湾（夏季）；叶绿素含量具有北岸大于南岸的平面分布特点和夏秋季高、冬春季低的季节变化特点。一年中出现两次与浮游植物繁盛期一致的叶绿素含量高值，分别为夏季（7月，10.34 mg/m3）和冬季（2月，7.00 mg/m3）。叶绿素含量存在显著的昼夜变化规律，并在不同季节表现为不同的节律：春季叶绿素含量正午最高；夏季和秋季在白天降低，中午达到最低值，最高值出现在夜间；冬季叶绿素含量白天上升，夜晚降低。在聚类分析和Pearson相关性分析的基础上，通过逐步回归建立了叶绿素含量与水环境因子的多元线性模型，得到了与叶绿素含量关系最密切的环境因子是溶解氧饱和度和水温；叶绿素含量与溶解氧饱和度和水温均呈显著正相关。 |
| 关键词: 厦门港 叶绿素 时空分布 水环境因子 多元分析 |
| DOI：10.11759/hykx20200108001 |
| 分类号:Q178 |
| 基金项目:国家重点研发计划课题项目（2016YFA0601302） |
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| Chlorophyll content in Xiamen Bay-spatiotemporal distribution and relationship with water environmental factors |
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YU Xiu-xia1, SUN Lin2, CHEN Chang-ping2
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1.Xiamen Environmental Monitoring Station, Xiamen 361000, China;2.Xiamen University, Xiamen 361102, China
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| Abstract: |
| Chlorophyll is an important indicator of water primary production and varies frequently with environmental factors. Therefore, annual continuous in-situ real-time monitoring can more accurately reflect the water primary production level and controlled factors.The chlorophyll content, water temperature, dissolved oxygen, pH value, and salinity of Xiamen Bay were monitored in 2017. The spatiotemporal distribution of the chlorophyll content was investigated, and the correlation between the chlorophyll content and main water environmental factors was studied through multivariate analysis. The results showed that the annual average chlorophyll content of Xiamen Bay was 3.89±7.76 mg/m3, and the maximum value was 163.00 mg/m3 that occurred in the Tongan Bay (summer). The chlorophyll content of the north coast was higher than that of the south coast, and the contents in summer and autumn were higher than those in winter and spring. There were two high levels of chlorophyll in the year, in summer (July, 10.34 mg/m3) and winter (February, 7.00 mg/m3), consistent with the phytoplankton proliferation period. In addition, the chlorophyll content presented a strong diurnal variation pattern and varied with seasons:In spring, the chlorophyll content was highest at noon; in summer and autumn, it decreased during the day and reached the lowest value at noon and the highest value at night; in winter, it rose during the day and decreased at night. On the basis of cluster analysis and Pearson correlation analysis, a multivariate linear model of chlorophyll content and water environmental factors was established through stepwise regression. The factors most closely related to chlorophyll content were dissolved oxygen saturation and water temperature. Chlorophyll content was significantly positive with both dissolved oxygen saturation and water temperature. |
| Key words: Xiamen Bay chlorophyll spatial and temporal distribution water environment factors multivariate analysis |
