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研究报告

The spatial distribution of chlorophyll a and its environment regulation in coastal area of Zhuhai

基金项目：中国科学院南海生态环境工程创新研究院自主部署项目（No.ISEE2019ZR03）；广东省海洋经济发展（海洋六大产业）专项（No.粤自然资合［2020］064号）；南方海洋科学与工程广东省实验室（广州）人才团队引进重大专项（No.GML2019ZD0402）

摘要：基于2017年11月（秋季）和 2018年3月（春季）两个航次在珠海近岸海域开展的水环境调查，分析了水质理化参数、叶绿素a的浓度以及叶绿素a的空间分布及其环境调控因素.结果显示：①春季海水中叶绿素a含量高于秋季，其中秋季表层海水中叶绿素a的浓度为0.47~20.64 μg?L^-1，平均值为3.23 μg?L^-1；底层浓度为0.74~13.27 μg?L^-1；平均值为2.18 μg?L^-1.春季表层海水中叶绿素a的浓度为1.32~63.90 μg?L^-1，平均值为9.35 μg?L^-1；底层浓度为2.21~7.46 μg?L^-1；平均值为4.36 μg?L^-1.春秋两季叶绿素a浓度变化规律存在相似性，呈现东北部高、西南部低的趋势.②不同水质参数对海水叶绿素a浓度的影响具有季节性差异，秋季对叶绿素a含量影响较大的参数有温度、盐度、溶解氧、活性磷酸盐；春季影响较大的参数则是盐度和化学需氧量.

Abstract：Based on the water environmental survey in November 2017 （autumn） and March 2018 （spring） in the coastal waters of Zhuhai， the physical and chemical parameters of water quality， the concentration and spatial distribution of chlorophyll a were analyzed. The results showed that： ①the concentration of chlorophyll a in spring was higher than in autumn. In autumn， The concentration of chlorophyll a in the surface seawater ranged from 0.47 to 20.64 μg?L^-1， with an average value of 3.23 μg?L^-1. The concentration of chlorophyll a in the bottom seawater ranged from 0.74 to 13.27 μg?L^-1， with an average value of 2.18 μg?L^-1； In spring， the concentration of chlorophyll a in the surface seawater ranged from 1.32 to 63.90 μg?L^-1， with an average value of 9.35 μg?L^-1； The concentration of chlorophyll a in the bottom seawater ranged from 2.21 to 7.46 μg?L^-1， with an average value of 4.36 μg?L^-1. In both spring and autumn， chlorophyll a showed higher concentration in the northeast and lower in the southwest. ②The influence of parameters on water quality had a seasonal variation. In autumn， the most influential parameters were temperature， salinity， dissolved oxygen， and phosphate， while salinity and chemical oxygen demand for spring