春季东海赤潮高发区尿素的断面分布及影响因素  

Distribution of urea section and its affecting factors in red-tide-frequent-occurrence area in spring

作　　者：苏莹[1,2] 姜聪聪[1,2] 石晓勇[1,2,3] 赵玉庭 梁生康[1,2] 王修林[1,2] 

机构地区：[1]中国海洋大学化学化工学院,山东青岛266100 [2]中国海洋大学海洋化学理论与工程技术教育部重点实验室,山东青岛266100 [3]国家海洋局海洋减灾中心,北京100194 [4]山东省海洋环境与资源研究院,山东烟台264006

出　　处：《海洋环境科学》2015年第2期171-175,189,共6页Marine Environmental Science

基　　金：国家重点基础研究发展计划(973)项目(2010CB428701)

摘　　要：根据2011年3月31日至5月27日对东海赤潮高发区ZA断面的6次调查数据,分析了该断面赤潮暴发前后尿素的断面分布及影响因素。结果表明：3月31日至4月20日硅藻赤潮暴发期间,尿素的浓度范围为0.06～3.27μmol/L,陆源输入为硅藻赤潮期间影响尿素浓度的主要因素;4月28日至5月27日甲藻赤潮暴发期间,尿素的浓度范围为0.12～3.46μmol/L,浮游植物的吸收利用是影响甲藻赤潮期间尿素浓度的主导因素。调查期间,该断面尿素浓度高值区整体呈现由近岸向远岸,再向近岸转移的分布趋势。且随着时间的推移,该断面尿素浓度整体呈现降低的趋势。根据甲藻赤潮暴发期间,ZA断面尿素浓度低于硅藻赤潮暴发期间,且低值区与叶绿素浓度高值区相对应这一尿素浓度分布特征和浓度水平,推测甲藻对尿素的有效吸收利用是维持东海赤潮高发区甲藻赤潮暴发的原因之一。Based on the 7 times of ZA section surveys in Dong Sea from March 31 to May 27 in 2011,characterization of urea sectional distribution in this area and its affecting factors during the outbreak of Harmful Algal Blooms were analyzed. The results showed that the concentration of urea ranged from 0. 06 to 3. 27 μmol / L during outbreak of diatom bloom from March 31 to April 28,mainly influenced by Changjiang dilution water. It decreased a lot and remained0. 12 ～ 2. 71 μmol / L when dinoflagellate red tide broke out in May,affected by metabolism of phytoplankton significantly. In the cruises,the high- value region of urea concentration presented characteristic of transferring far away from coastal area and then slowly closing the inshore. The whole urea contents showed a decreasing trend with the passing of time. The level of urea concentration during outbreak of dinoflagellate red tide was less than that when diatom red tide outbroke and its low area was corresponded with the high values of the concentration of chlorophyll,suggesting that the effective absorption and utilization of urea for dinoflagellate was one of the reasons to maintain a high incidence of dinoflagellate red tide in East China Sea.

关 键 词：东海 尿素 赤潮 硅藻 甲藻 

分 类 号：X145[环境科学与工程—环境科学]