摘要
根据2002—2005年4—9月份象山港赤潮监控区表层海水营养盐(Si,N和P)监测基础资料,分析、探讨了监控区水域的营养盐变化及其结构特征。分析结果表明:4年来,监控区水质富营养化严重,DIN的污染程度明显高于PO4-P;Si,N和P营养盐含量的空间波动程度存在明显的年际差异;SiO3-Si,PO4-P和NO3-N含量的月变化特征主要受港湾内藻类等浮游植物的生命活动和陆源径流的共同影响;NH4-N含量的月变化特征受鱼类新陈代谢强弱的影响。4年来NH4-N的含量略有升高,NO3-N和SiO3-Si的含量均有所降低,而NO2-N和PO4-P的含量则保持稳定;SiO3-Si/PO4-P比值略有所减小,NO2-N/DIN,NH4-N/DIN,NO3-N/DIN,DIN/PO4-P和SiO3-Si/DIN的比值均保持稳定。4年来整个监控区DIN一直处于热力学平衡状态,NO3-N量占DIN的83.77%～97.23%,是该海域DIN的主要存在形式,PO4-P一直是该海域初级生产力的主要潜在限制性因子。SiO3-Si/DIN<1,与DIN相比,SiO3-Si略显不足。
On the basis of the monitoring data of nutrients （ Si, N and P ） in surface seawater from April to September （ 2002- 2005 ） in the red tide-monitoring area of Xiiangshan Harbor, variations on nutrients and the characteristics of their structure in the red tide-monitoring area were analyzed and discussed in periods of high frequency for the red tide. The results of analysis have shown that the water quality in the red tide-monitoring area was still seriously over-nutritious and was polluted by high N and low P obviously in recent four years; The annual difference of the spatial fluctuation of Si, N and P content was observed obviously; The character of monthly variations of SiO3-Si, PO4-P and NO3-N content was mainly under the influence of phytoplankton life and the stream-flow fromland; NH4-N was mainly under the influence of fish-metabolism activity. In recent four years, NH4-N content was increasing appreciably, SiO3-Si content was decreasing appreciably, NO2-N and PO4-P kept steady; SiO3-Si/PO4-P was decreasing appreciably, NO2-N/DIN, NH4-N/DIN, NO3-N/DIN, DIN/PO4-P and SiO3-Si /DIN all kept steady. The inorganic- nitrogen（ DIN ） has been in a state of thermodynamic-balance in the whole the red tide- monitoring area, the ratio of NO3-N to DIN was 83.77 % - 97.23 %, dominating existing form of inorganic- nitrogen （ DIN ） in the water quality of Xiiangshan Harbor sea area, and PO4-P the while restrict marine phytoplankton growth of red tide-monitoring area, was the main potential limiting factor to the primary production of the red tide-monitoring area of Xiiangshan Harbor in recent four years. SiO3-Si/DIN 〈 1 and, compared with the DIN content, SiO3-Si was insufficient appreciably.
出处
《海洋通报》
CAS
CSCD
北大核心
2006年第6期1-9,共9页
Marine Science Bulletin
关键词
象山港
赤潮监控区
营养盐结构
富营养化
Xiangshan Harbor
red tide-monitoring area
nutrient structure
eutrophication
