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Distribution and controlling factors of particulate organic matter in the frequent harmful algal blooms areas of the East China Sea in spring

刘超
1. 中国海洋大学化学化工学院, 青岛 266100;2. 中国海洋大学海洋化学理论与工程技术教育部重点实验室, 青岛 266100;4. 国家海洋局北海环境监测中心, 青岛 266033;5. 国家海洋局海洋溢油鉴别与损害评估技术重点实验室, 青岛 266033

石晓勇
1. 中国海洋大学化学化工学院, 青岛 266100;2. 中国海洋大学海洋化学理论与工程技术教育部重点实验室, 青岛 266100;3. 国家海洋局海洋减灾中心, 北京 100194

摘要：依据2010年5月对东海赤潮高发区的现场调查数据，分析研究了颗粒有机物的浓度变化和分布特征，并对其影响因素进行了探讨.结果表明，春季东海赤潮高发区颗粒有机物（POC和PON）的浓度范围为91.15~3655.17 μg·L^-1和12.59~684.57 μg·L^-1，平均值分别为（745.64±632.05）μg·L^-1和（126.04±106.32）μg·L^-1；平面分布上，颗粒有机物整体上呈现近岸高、远岸低的分布特点，长江口外、舟山群岛东南海域以及闽浙沿岸都出现高值；垂直分布上，颗粒有机物呈现出典型的表层高、底层低的特征，表现出大洋水的性质；周日变化上，除了30 m层以下颗粒有机物比较稳定外，各层颗粒有机物整体上表现出全日周期变化.长江口外颗粒有机物的高值中心主要受陆源输入（主要是长江径流）的影响，舟山群岛东南海域以及闽浙沿岸海域颗粒有机物高值区主要受浮游植物活动的影响，底层颗粒有机物主要受到了底层沉积物再悬浮的影响.

Abstract：Based on the data obtained from cruises in May 2010, spatial distribution of particulate organic matter and its relationship with various environmental factors in the Frequent Harmful Algal Blooms Areas of the East China Sea were investigated. The results showed that concentrations of POC and PON) were from 91.15 to 3655.17 μg·L^-1and from 12.59 to 684.57 μg·L^-1, respectively. The average concentrations of POC and PON were (745.64±632.05) μg·L^-1 and (126.04±106.32) μg·L^-1, respectively. POM presented a decrease trend from inshore to offshore. Highest concentrations were observed in the estuary of Yangtze river, southeast of Zhoushan island and the coastal areas of Fujian. Vertically, POM generally decreased from the surface to the bottom, which showed oceanic characteristics. Diurnal variation was observed in waters lower than 30 m. As for the surface and middle POM, terrestrial inputs and biological activity are the controlling factors, while resuspention is the main controlling factor for POM in bottom and offshore waters.

Key words：particulate organic matter(POM) distribution environmental factors the East China Sea terrestrial inputs biological activity resuspention