大亚湾营养物质变异特征
The characteristics of nutrients variation in the Daya Bay
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摘要: 利用大亚湾现场调查和室内模拟数据,以及大亚湾生态网络17～18年8个航次的现场调查资料,采用营养状态质量指数(NQI)的方法评价大亚湾海域富营养化水平,结果表明,大亚湾海域除部分养殖海区为中营养状态外,大部分为贫营养状态;溶解态的无机磷和硅在过去10a多有较大幅度的下降,而溶解态的无机氮、溶解氧和叶绿素a则上升;浮游植物生长由过去认为由氮控制转变为现在由磷控制.分析了养殖海区底层海水、上覆水、沉积物间隙水中营养盐的含量及其化学形态.估算了沉积物-海水界面营养盐扩散通量,NH4+,NO2-,NO3-,HPO42-,H4SiO4平均通量分别为302.0,-0.06,-1.82,2.53,47.6μmol/(m2·d).室内模拟了天然海水体系表层沉积物营养盐的吸附-解吸及其磷酸盐在沉积物上的吸附等温线.论述了大亚湾海域营养盐与赤潮的关系.Abstract: Investigation data in-situ and simulation data in laboratory are used,combining with Chinese Ecological Research Network(CERN) investigation data of 8 cruises from 1997 to 1998 in the Daya Bay,to assess eutrophication status by nutrient quality index(NQI) method in the Daya Bay.Most of water areas of the Daya Bay are oligotrophication,except the cultural water area is mesotrophication.The growth of phytoplankton is governed now by phosphorus instead of by nitrogen in the past.The nutrients content and their chemical forms in the interstitial water,the overlying water and the bottom water are analyzed.The diffusive fluxes of nutrient across sediment-sea water interface have been calculated,and the,average fluxes of ammonium,nitrite,nitrate,phosphate and silicate are 302.0,-0.06,-1.82,2.53,47.96 μamol/(m2·d),respectively.The desorption-absorption of nutrients in surface sediments is simulated and the absorption isotherm of phosphate on sediments is studied under the natural sea water system.The relationship of nutrients and red tides in the Daya Bay are discussed.
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Key words:
- nutrients /
- flux /
- desorption-absorption /
- red tides
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