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Nutrient composition and distributions in coastal waters impacted by the Changjiang plume
作者姓名:WANG Xiulin  WANG Baodong  ZHANG Chuansong  SHI Xiaoyong  ZHU Chenjian  XIE Linping  HAN Xiurong  XIN Yu  WANG Jiangtao
作者单位:WANG Xiulin,ZHANG Chuansong,SHI Xiaoyong,ZHU Chenjian,XIE Linping,HAN Xiurong,XIN Yu,WANG Jiangtao(College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China);WANG Baodong(First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China) 
基金项目:国家重点基础研究发展规划(973计划),国家自然科学基金,the Doctoral Foundation under contract,the Key Project of the Ministry of Education of China under contract 
摘    要:Four cruises were conducted during 2002--2003 in the Changjiang Estuary and adjacent coastal areas. The data presented show a clear coast to open sea gradient in nutrients related to the river inputs. Maximum values of chlorophyll a were typically observed at intermediate salinities at surface water and coincided with non-conservative decreases in nutrients along the salinity gradient, indicating that removal of nutrients was related to phytoplankton uptake. The seasonal variations of nutrient concentrations were just opposite to those of chlorophyll a, indicating that the seasonal variations of nutrients were mainly controlled by phytoplankton uptake, whereas riverine inputs merely weakened or balanced its extent. During the estuarine mixing, phosphate demonstrated some remobilization during all the four cruises; whereas both conservative and non-conservative behaviors for dissolved inorganic nitrogen and silicate were observed in the study area, indicating that both biotic and abiotic events may affect their behaviors during the estuarine mixing. Under the influence of freshwater inputs with high value of ratio of nitrogen to phosphorus, the estuarine and coastal waters impacted by the Changjiang plume were high ( 〉 30) in ratio of nitrogen to phosphorus, but rates of primary production were apparently not constrained by any kind of nutrient elements. However, the low ( 〈 1 ) ratio of silicate to nitrogen in most of the study area might be linked with the rapidly increasing frequency of harmful algal bloom (HAB) incidents in recent years in the coastal waters impacted by the Changjiang plume.

关 键 词:磷酸盐  海洋学  营养盐分析  长江
收稿时间:2007/6/18 0:00:00
修稿时间:2008/4/28 0:00:00

Nutrient composition and distributions in coastal waters impacted by the Changjiang plume
WANG Xiulin,WANG Baodong,ZHANG Chuansong,SHI Xiaoyong,ZHU Chenjian,XIE Linping,HAN Xiurong,XIN Yu,WANG Jiangtao.Nutrient composition and distributions in coastal waters impacted by the Changjiang plume[J].Acta Oceanologica Sinica,2008,27(5):111-125.
Authors:WANG Xiulin  WANG Baodong  ZHANG Chuansong  SHI Xiaoyong  ZHU Chenjian  XIE Linping  HAN Xiurong  XIN Yu and WANG Jiangtao
Institution:1.College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China2.First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Abstract:Four cruises were conducted during 2002-2003 in the Changjiang Estuary and adjacent coastal areas. The data presented show a clear coast to open sea gradient in nutrients related to the river inputs. Maximum values of chlorophyll a were typically observed at intermediate salinities at surface water and coincided with non-conservative decreases in nutrients along the salinity gradient, indicating that removal of nutrients was related to phytoplankton uptake. The seasonal variations of nutrient concentrations were just opposite to those of chlorophyll a, indicating that the seasonal variations of nutrients were mainly controlled by phytoplankton uptake, whereas riverine inputs merely weakened or balanced its extent. During the estuarinc mixing, phosphate demonstrated some remobilization during all the four cruises; whereas both conservative and non-conservative behaviors for dissolved inorganic nitrogen and silicate were observed in the study area, indicating that both biotic and abiotic events may affect their behaviors during the estuarine mixing. Under the influence of freshwater inputs with high value of ratio of nitrogen to phosphorus, the estuarine and coastal waters impacted by the Changjiang plume were high (>30) in ratio of nitrogen to phosphorus, but rates of primary production were apparently not constrained by any kind of nutrient elements. However, the low ( < 1 ) ratio of silicate to nitrogen in most of the study area might be linked with the rapidly increasing frequency of harmful algal bloom (HAB) incidents in recent years in the coastal waters impacted by the Changjiang plume.
Keywords:nutrients  chlorophyll  Changjiang River (Yangtze River)  eutrophication  mixing  nutrient limitation
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