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学科主题: Oceanography
题名: Phosphorus limitation in the northern South China Sea during late summer: Influence of the Pearl River
作者: Xu, J ; Yin, KD ; He, L ; Yuan, XC ; Ho, AYT ; Harrison, PJ
通讯作者: kdyin@scsio.ac.cn
关键词: Phosphate limitation ; Nitrogen limitation ; Northern South China Sea ; Pearl River discharge ; Nutrient enrichment bioassays ; Phosphate turnover time ; APA
刊名: DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
发表日期: 2008
卷: 55, 期:10, 页:1330-1342
收录类别: sci
部门归属: [Yin, Kedong; He, Lei] CAS, S China Sea Inst Oceanol, Key Lab Trop Marine Environm Dynam, Guangzhou 510301, Guangdong, Peoples R China; [Yin, Kedong] Griffith Univ, Australian Rivers Inst, Brisbane, Qld 4111, Australia; [Xu, Jie; He, Lei; Yuan, Xiangcheng; Ho, Alvin Y. T.; Harrison, Paul J.] Hong Kong Univ Sci & Technol, Atmospher Marine & Coastal Environm Program, Kowloon, Hong Kong, Peoples R China
项目归属: LED
摘要: The Pearl River outflow influences a large area of the northern South China Sea (SCS) under the prevalence of the southwest monsoon winds in summer. The Pearl River has high concentrations of nitrate (similar to 100 mu M) and relatively low phosphate (similar to 1 mu M). Little is known about how the input of the Pearl River discharge with high N:P ratios influences nutrient limitation in the coastal and offshore waters of the northern SCS. In the late summer of 2005 and 2006, two cruises were conducted to examine which nutrient, N or P, is the primary nutrient limiting the growth of phytoplankton and bacteria in the northwestern SCS by using a combination of nutrient enrichment bioassays, the induction of the enzyme alkaline phosphatase and the uptake rate of the 33p isotope tracer. Our results showed that 33p turnover times always agreed with the turnover times of alkaline phosphatase activity. Turnover times were short in P-limited areas influenced by the Pearl River, but long in oceanic-dominated N-limited areas (not influenced by the Pearl River). Nitrogen and phosphorus availability was relatively balanced in the SCS basin as nutrient enrichment bioassays indicated that phytoplankton was potentially co-limited by N and P, with N limitation occurring before P. However. in river-impacted areas of the shelf, the balance of available N and P changed due to a high riverine N:P ratio of similar to 100:1 and phytoplankton biomass was elevated (up to 3.4 mu g Chl a L-1) due to the relatively high nutrient input of the Pearl River discharge. As a result, phytoplankton and bacterial growth was actually P-limited due to the contribution of excess N from the Pearl River plume in late summer. The degree of P limitation was the most severe at the inner shelf stations with the lowest salinity (28.4) and declined in the offshore direction as salinity increased. The input of relatively high nutrients from the Pearl River discharge resulted in a high contribution of phytoplankton (> 66%) to total particulate organic phosphorus. Therefore, whether N or P is the most limiting nutrient for the shelf waters in the northern SCS depends on whether the seawater is influenced by the Pearl River estuarine coastal plume, the size of which is influenced by river discharge, rainfall and winds. (c) 2008 Published by Elsevier Ltd.
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WOS记录号: WOS:000259888800010
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/5959
Appears in Collections:热带海洋环境动力实验室(LTO)_期刊论文

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Xu, J; Yin, KD; He, L; Yuan, XC; Ho, AYT; Harrison, PJ.Phosphorus limitation in the northern South China Sea during late summer: Influence of the Pearl River,DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,2008,55(10):1330-1342
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