大亚湾大辣甲水域叶绿素a及营养盐的垂直分布与季节变化

为了较为系统地研究大亚湾水域叶绿素a和营养盐的垂直分层状况, 并为大亚湾海洋生态系统的数值模拟提供基础数据, 作者于大亚湾大辣甲和桑洲之间连线的中间点附近海域选点, 在2007年～2008年进行了4个季度的垂直采样监测。本次研究分析了大亚湾大辣甲水域叶绿素a及营养盐的垂直分布与季节变化, 并分析了叶绿素a与DIN、PO₄-P和SiO₃-Si的关系。结果表明:在整个监测时段内, 叶绿素a和DIN、PO₄-P、SiO₃-Si的浓度范围分别为0.50～5.80 mg·m^-3、0.023～0.159 mg·L^-1、1.606～19.69μg·L^-1和0.065～1.13 mg·L^-1, 营养盐和叶绿素a在4个季度里的垂直变化趋势各有不同;在季节变化上, SiO₃-Si与DIN比较相似, 总体呈现夏、冬、秋季高, 春季较低的特征, PO₄-P恰好相反, 夏季的浓度最低, 叶绿素a总体呈现夏、春、冬季高, 秋季较低的特征;在整个垂直水柱内, DIN和SiO₃-Si对叶绿素a的影响相对较小, PO₄-P和叶绿素a呈显著正相关关系。

The vertical distribution and seasonal variations of chlorophyll a and nutrients content in Dalajia waters in Daya Bay

In order to systematically examine the vertical distribution of chlorophyll a and nutrients, and to provide the original data for marine ecosystem simulation, water quality and marine ecosystem data were collected in four different seasons from October 2007 to September 2008. The sampling site was located at the central point between Dalajia Island and Sangzhou Island. The study examined the vertical distribution and seasonal variation of chlorophyll a and nutrients, and analyzed the correlation between chlorophyll a and dissolved inorganic carbon (DIC), PO₄-P, and SiO₃- Si. The results showed that the variations of chlorophyll a, DIN, PO₄-P and SiO₃-Si were 0.50-5.80 mg·L^-1, 0.023-0.159 mg·L^-1, 1.606-19.69 μg·L^-1 and 0.065-1.13 mg·L^-1, respectively. The seasonal variations of chlorophyll a were higher in summer, spring, and winter but lower in autumn. SiO₃-Si and DIN were similar, which were higher in summer, autumn, and winter, but lower in spring. PO₄-P showed a reverse trend, which was the lowest in summer. The impact of DIN and SiO₃-Si on chlorophyll a was low in vertical variation. The PO₄-P and chlorophyll a showed a positive correlation, indicating that the impact of PO₄-P on chlorophyll a was great.