The characteristics of nutrients variation in the Daya Bay
The characteristics of nutrients variation in the Daya Bay
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DOI：
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发表时间：
2001
影响因子：
1.4
通讯作者：
Qiu Yao-wen
中科院分区：
文献类型：
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作者：
Qiu Yao-wen
利用现场调查数据和实验室模拟数据，结合中国生态研究网络(CERN)1997~1998年在大亚湾8个航次的调查资料，采用营养质量指数(NQI)法对大亚湾的富营养化状况进行了评价。除养殖水域为中营养化外，大亚湾大部分水域为富营养化水域。浮游植物的生长现在是由磷而不是过去的氮来控制的。分析了间隙水、上覆水和底水中营养盐的含量及其化学形态。计算了沉积物-海水界面的营养盐扩散通量，其中氨氮、亚硝酸盐、硝酸盐、磷酸盐和硅酸盐的平均通量为302。0，-0。06，-1.82，2.53，4796μ摩尔(m2.D)。模拟了表层沉积物中营养盐的解吸-吸附过程，研究了天然海水体系下沉积物对磷酸盐的吸附等温线。讨论了营养盐与大亚湾赤潮的关系。
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 eutrophica- tion status by nutrient quality index (NQI) method in the Daya Bay. Most of water areas of the Daya Bay are olig otrophication, 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. 96μmol(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.