摘要
根据2012—2013年龙江入海口水域的水质调查数据,对该水域氮、磷营养盐分布状况、结构特征及富营养评价进行了研究。结果表明,2012年和2013年DIN含量范围分别为0.808~5.285、0.610~5.383 mg/L,PO4-P含量范围分别为0.028~0.324、0.096~0.643mg/L,呈不同程度的超标状态并有上升趋势。受海水稀释作用,营养盐浓度由河口向外逐渐降低;受枯水期地表径流减少导致营养盐浓缩的影响,营养盐含量呈现冬、春季高,夏、秋季低的季节性变化;NH4-N在DIN中的占比在51.15%~63.25%和43.88%~69.39%之间,DIN的污染程度主要受NH4-N控制。营养盐结构上N/P比值范围为10.83~13.12,接近适合浮游植物生长繁殖的Redfield比值（16∶1）,潜在性富营养化程度评价分析表明该水域处于富营养化状态,N、P营养盐绝对浓度高,可能有赤潮等严重海洋生态问题发生的潜在风险。
Based on the data from water surveys in 2012 and 2013, the distribution, composition and eu- trophication of nitrogen and phosphate in Longjiang Estuary were studied. The results indicated that the DIN and PO4 - P concentrations ranged from 0. 808 - 5. 285, 0. 610 - 5. 383 mg/L and 0. 028 - 0. 324, 0. 096 0. 643 mg/L, respectively, and showed varying degrees of excessive status and rising trend. There was a pro- nounced decreasing trend of N and P concentrations from riverine to marine regions because of the dilution by relative oligotrophic coastal waters, and N and P values in the seawater were high in winter/spring festival and low in summer/autumn festival due to the impact of reduction in surface runoff during the dry season. NH4 - N ratios in DIN were as high as 51.15% -63.25% and 43.88%-69. 39% during two years, dominating the state of pollution of DIN in the estuary. The N/P ratios ranged from 10. 83 - 13.12 and were closed to Redfield value （ 16：1 ）, based on this nutrient conditions, it may suitable for phytoplankton bloom. The potential eutrophication assessment indicated that the stations in Longjiang Estuary were at the stage of eutrophi- cation, Longjiang Estuary may have faced with more serious threat such as red tide by eutrophication because of the high absolute concentrations of nitrogen and phosphorus.
出处
《福建水产》
2015年第3期211-219,共9页
Journal of Fujian Fisheries
关键词
海洋化学
龙江
营养盐
富营养化
marine chemistry
Longjiang Estuary
nutrient
eutrophication
