Nutrient Dynamics in Jiaozhou Bay

Three cruises were carried out in Jiaozhou Bay (JZB) in the neap tide in October 2002 (fall) and in both neap and spring tides in May 2003 (spring) to understand the relative importance of external nutrient inputs versus physical transport and internal biogeochemical processes. Nutrients (, , , , silicic acid, total dissolved nitrogen (TDN) and phosphorus (TDP), dissolved organic nitrogen (DON) and phosphorus (DOP)) were measured. The concentrations of nutrients were higher in the northern part than in the southern part. High concentrations of and DON in JZB demonstrated the anthropogenic input. Ambient nutrient ratios indicated that the potential limiting nutrients for phytoplankton growth were silicon, and then phosphorus. Nutrients showed an obvious tidal effect with low values at flood tide and high values at ebb tide. Nutrient elements were transported into JZB in the north and output in the south (i.e., into the Yellow Sea), which varied with season, tidal cycle and investigation sites. Water exchange between JZB and the Yellow Sea exports , and DON out of JZB, while it inputs , silicic acid and DOP into JZB. Nutrient budgets demonstrate that riverine input and wastewater discharge are major sources of nutrients, while residual flow is of minor importance in JZB ecosystem. JZB is a sink for the nutrient elements we studied except for DON. Stoichiometric calculations demonstrate that JZB is a net autotrophic system.     

湄洲湾海域底质重金属环境背景值研究

根据湄洲湾区域自然环境特点 ,用背景区调查法 ,选择远离污染源的洁净海区进行表层底质重金属调查 ,并进行数据技术处理和影响因素分析。提出湄洲湾海域底质重金属环境背景值     

长江口-杭州湾生态环境监测点位优化布设及水质分析

河口海湾位于陆海交错带,受径潮流作用的双重影响,具有物质输运格局复杂、生态环境变化梯度大等特点。生态环境监测点位布设与优化是科学、客观评估河口海湾生态环境状况的前提。采用空间平衡抽样法开展监测点位增设和优化方案研究,将2020年5月上海市海洋环境趋势性监测布设的142个监测点位,增设至200个,并进一步优化至170个,对优化前后的点位数据进行显著性检验、方差分析和空间自相关分析。结果显示:2组数据之间无显著性差异,并且优化后点位的方差和空间自相关值更小,说明空间平衡抽样法适用于河口海湾生态环境监测点位布设和优化,点位布设和优化结果可客观反映河口海湾的生态环境状况。随后,采用泰森多边形法确定了优化所得的170个离散点位的海域代表面积,克服现有空间插值法的缺陷,为河口海湾生态环境总体状况评价提供技术参考。