The Subtropical Zhujiang (Pearl River) Estuary: Nutrient, Trace Species and Their Relationship to Photosynthesis
The Subtropical Zhujiang (Pearl River) Estuary: Nutrient, Trace Species and Their Relationship to Photosynthesis
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DOI：
10.1006/ecss.1999.0500
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发表时间：
1999-09
影响因子：
2.8
通讯作者：
Jing Zhang;Z. G. Yu;J. T. Wang;J. Ren;H. T. Chen;H. Xiong;L. Dong;W. Y. Xu
中科院分区：
文献类型：
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作者：
Jing Zhang;Z. G. Yu;J. T. Wang;J. Ren;H. T. Chen;H. Xiong;L. Dong;W. Y. Xu
在1996年8 - 9月和1997年1 - 2月的丰水期（1996年8 - 9月）和枯水期（1997年1 - 2月），对珠江口营养盐和痕量物种及其与海洋生产的关系进行了研究。珠江的营养盐（NO3-、NH 4+、PO 43-和溶解态SiO2）和其他主要和痕量物种（碱度、DOC和Al）的浓度一般在中国河流的范围内，与其他大系统（如黄河和长江）相当。在河口，一些物种（如SiO2）说明了一个相当明确的关系与氯度，而其他人表现出相当大的再动员和/或淡水端员的变化，由于事实上，淡水进入南海的8个通道，不同的水流和不同的组成。使用原位水样的孵化实验表明，虽然磷酸盐是限制元素在河流的污水羽，光合作用变成氮和/或硅限制进一步离岸的陆架区。微量元素（如Cu ~（2+）和Fe ~（2+））对珠江口浮游植物光合作用有重要影响，其中Fe ~（2+）对浮游植物光合作用的限制作用大于Cu ~（2+）。大气湿沉降很可能会刺激光合作用，从而表明与该地区的藻华的潜在联系。大气对光合作用的影响由河口向南海内陆逐渐增大。实验数据进一步表明，在珠江口浑浊区，悬浮物的辐射减少可能是一个重要的问题，限制光合作用，虽然富营养化是相当普遍的中国沿海环境。
Two cruises were undertaken to study the nutrients and trace species and their relation to marine production in the Zhujiang (Pearl River) Estuary, which cover both wet (August–September, 1996) and dry (January–February, 1997) seasons. Concentrations of nutrients (NO3−, NH4+, PO43−, and dissolved SiO2) and other major and trace species (alkalinity, DOC and Al) in the Zhujiang are generally within the range of Chinese rivers and comparable to other large systems, like the Huanghe (Yellow River) and Changjiang (Yangtze River). In the estuary, some species (e.g. SiO2) illustrate a fairly defined relationship with chlorinity, whereas others show considerable remobilization and/or changes in freshwater end-members, owing to the fact that fresh water enters the South China Sea from eight channels with various water flow and different compositions. The incubation experiments using in situ water samples reveal that while phosphate is the limiting element in riverine effluent plume, the photosynthesis turns to be nitrogen and/or silicon limited further offshore on the shelf region. Trace species (e.g. Cu2+and Fe2+) have important impact on the photosynthesis in the Zhujiang Estuary, with Fe2+to be a more limiting element than Cu2+. Atmospheric wet deposition may well stimulate photosynthesis and hence demonstrate a potential link with algal blooms in this area. Atmospheric impact on the photosynthesis increases from estuary toward the interior of South China Sea. The experimental data further suggest that in the turbid region of the Zhujiang Estuary, radiation reduction by suspended materials could be an important issue limiting photosynthesis, although the eutrophication is quite common in coastal environments of China.