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学科主题: Ecology; Marine & Freshwater Biology; Oceanography
题名: Shift from P to N limitation of phytoplankton growth across the Pearl River estuarine plume during summer
作者: Yin, KD ; Qian, PY ; Wu, MCS ; Chen, JC ; Huang, LM ; Song, XY ; Jian, WJ
通讯作者: Yin, KD, Hong Kong Univ Sci & Technol, Dept Biol, Kowloon, Hong Kong, Peoples R China
关键词: nutrient ratios ; N : P ; N : SI ; nutrient limitation ; Pearl River estuary ; Hong Kong ; northern South China Sea
刊名: MARINE ECOLOGY-PROGRESS SERIES
发表日期: 2001
卷: 221, 页:17-28
收录类别: sci
部门归属: Hong Kong Univ Sci & Technol, Dept Biol, Kowloon, Hong Kong, Peoples R China; Hong Kong Univ Sci & Technol, Ctr Coastal & Atmospher Res, Kowloon, Hong Kong, Peoples R China; Chinese Acad Sci, S China Sea Inst Oceanog, Guangzhou 510301, Peoples R China
项目归属: LED
摘要: Anthropogenic loading of nutrients in rivers often increases disproportionally among N, P, and Si, and thus may shift the type of phytoplankton nutrient limitation in the coastal receiving waters. The effect of anthropogenic nutrient loading has rarely been addressed in the Pearl River estuary along the southern coast of China, even though it is one of the largest rivers in the world. We conducted a cruise along the Pearl River estuary and adjacent coastal waters south of Hong Kong during July 17 to 18, 1999, Samples were taken for salinity and nutrients (NO3, SiO4, PO4, NH4 and urea) and nutrient addition experiments were conducted on board. Vertical profiles of salinity showed a salt-wedge estuary and the coastal plume covering the waters south of Hong Kong. Concentrations of NO3 were very high (ca 90 muM) upstream of the Pearl River estuary, and much of the riverine NO3 was not utilized in the estuary until depletion at the edge of the coastal plume on the east side of Hong Kong. SiO4 was 120 muM upstream and its utilization was similar to that of NO3. PO4 was low in surface waters (< 0.5 muM) and higher below the halocline in the estuary. NH4 and urea were generally <4 and 1.5 muM, respectively. In the estuary, N:P ratio was 200:1, indicating potential P limitation, while N:Si was below 1 1. Beyond the coastal plume to the east of Hong Kong, N:P and N:Si ratios were <5:1 and 1:0.3, respectively, indicating potential N limitation. Nutrient limitation was shown in nutrient addition experiments and was consistent with the ratios of nutrients, Therefore, nutrient limitation shifted across the coastal plume from P limitation in the estuary to N limitation in the oceanic waters. Potential P limitation was observed in the estuary; P and Si co-limiting occurred at the edge of the coastal plume, and N was limiting in the oceanic side. This spatial shift in nutrient limitation has great implications for nutrient pollution control and coastal management of Hong Kong waters.
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WOS记录号: WOS:000172382700002
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/5487
Appears in Collections:热带海洋环境动力实验室(LTO)_期刊论文

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Yin, KD; Qian, PY; Wu, MCS; Chen, JC; Huang, LM; Song, XY; Jian, WJ.Shift from P to N limitation of phytoplankton growth across the Pearl River estuarine plume during summer,MARINE ECOLOGY-PROGRESS SERIES,2001,221():17-28
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