| WANG Xiulin,WANG Baodong,ZHANG Chuansong,SHI Xiaoyong,ZHU Chenjian,XIE Linping,HAN Xiurong,XIN Yu,WANG Jiangtao. 2008. Nutrient composition and distributions in coastal waters impacted by the Changjiang plume. Acta Oceanologica Sinica, (5):111－125 |
| Nutrient composition and distributions in coastal waters impacted by the Changjiang plume |
| Nutrient composition and distributions in coastal waters impacted by the Changjiang plume |
| Received:June 18, 2007 Revised:April 28, 2008 |
| DOI： |
| Key words:nutrients chlorophyll Changjiang River (Yangtze River) eutrophication mixing nutrient limitation |
| 中文关键词: nutrients chlorophyll Changjiang River (Yangtze River) eutrophication mixing nutrient limitation |
| 基金项目:The National Key Basic Research Program under contract Nos 2001CB409703 and 2002CB714008, the Natural Science Foundation of China under contract Nos NSFC-40136020 and NSFC-40376033, the Doctoral Foundation under contract No. 20020423006 and the Key Project of the Ministry of Education of China under contract No. 01110. |
| Author Name | Affiliation | E-mail | | WANG Xiulin | 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 | wangbd@fio.org.cn | | ZHANG Chuansong | College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China | | | SHI Xiaoyong | College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China | | | ZHU Chenjian | College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China | | | XIE Linping | College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China | | | HAN Xiurong | College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China | | | XIN Yu | College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China | | | WANG Jiangtao | College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China | |
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| 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 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. |
| 中文摘要: |
| 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. |
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