Nutrient and eutrophication characteristics of the Dongshan Bay,South China
(0) We recorded NO3-N,NO2-N,NH4-N,PO4-P,SiO3-Si,salinity,and temperature data at 10 stations in the Dongshan Bay in May,June,July,August,October,and November 2008,analyzing nutrient and eutrophication characteristics.The mean concentration of dissolved inorganic nitrogen (DIN) was 0.30-0.40 mg/dm3; generally,NO3-N was the main form in most areas.The mean concentrations of PO4-P and SiO3-Si were 0.040-0.060 mg/dm3 and 1.00-1.50 mg/dm3,respectively.We proved that the majority of the SiO3-Si in the Dongshan Bay came from the Zhangjiang River,with some coming from the Bachimen Strait.DIN originated from both the Zhangjiang River and the Bachimen Strait.Most PO4-P originated from the Bachimen Strait,and some came from the Zhangjiang River.We found that P was an overall limiting factor to the phytoplankton community in most of the Dongshan Bay,and that Si and N were in surplus.However,near the Bachimen Strait Si became a limiting factor,especially for diatoms,while P and N were in comparative surplus.We used a potential eutrophication assessment method to analyze eutrophication,and showed that the most serious eutrophication occurred near the Zhangjiang River estuary and near the Bachimen Strait.In 2008,DIN levels were four times higher than that in 1988; PO4-P levels were three-fold higher,while SiO3-Si was approximately double.Dissolved nutrients increased between 1988 and 2008.DIN increased at the greatest rate comparing to PO4-P and SiO3-Si,thus the N/P and N/Si mol ratios increased.Further studies on the effects of high DIN concentrations on the phytoplankton communities and marine ecosystems of the Dongshan Bay are needed.
nutrients estuary eutrophication the Dongshan Bay South China
陈宝红 暨卫东 周开文 贺青 傅婷婷
国内会议
福建省海洋学会2014年学术年会暨福建省科协第十四届学术年会分会场
福建平潭
英文
633-648
2014-09-01（万方平台首次上网日期，不代表论文的发表时间）