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学科主题: Environmental Sciences; Marine & Freshwater Biology
题名: Inorganic and Organic Nitrogen Uptake by Phytoplankton and Bacteria in Hong Kong Waters
作者: Yuan, XC ; Glibert, PM ; Xu, J ; Liu, H ; Chen, MR ; Liu, HB ; Yin, KD ; Harrison, PJ
通讯作者: xcyuan@scsio.ac.cn
关键词: N uptake ; Size-fractionated phytoplankton ; Bacteria ; Coastal waters ; Pearl River estuary
刊名: ESTUARIES AND COASTS
发表日期: 2012
卷: 35, 期:1, 页:325-334
部门归属: [Yuan, Xiangcheng; Yin, Kedong] Chinese Acad Sci, S China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China; [Yuan, Xiangcheng; Xu, Jie; Liu, Hao; Chen, Mianrun; Liu, Hongbin; Harrison, Paul J.] Hong Kong Univ Sci & Technol, Div Environm, Kowloon, Hong Kong, Peoples R China; [Glibert, Patricia M.] Univ Maryland, Ctr Environm Sci, Cambridge, MD 21613 USA; [Yin, Kedong] Zhong Shan Sun Yat Sen Univ, Sch Marine Sci, Guangzhou, Guangdong, Peoples R China
项目归属: LTO
摘要: Measurements of uptake rates of inorganic (NO3- and NH4+) and organic (urea, glycine, and glutamic acid) N, and indirect estimates of total N uptake by bacteria, were made in four contrasting environments in sub-tropical Hong Kong waters in summer of 2008. In addition, the effects of several days of rain on N uptake rates were studied in eastern waters. Although ambient NO3- was the dominant form of N in Hong Kong waters, the dominant N form taken up by phytoplankton was usually NH4+ and organic N, including urea and amino acids, rather than NO3-. Hence, because of the low NO3- uptake, there was a long turnover time for NO3- (100 days), and most of the NO3- was apparently transported offshore into deeper shelf waters. In eastern waters where NH4+ was undetectable, NO3- uptake rates were positively correlated with phytoplankton cell size. In contrast, potential rates of glutamic acid uptake were negatively correlated with phytoplankton size. N uptake rates in the smaller size fraction (0.7-2.8 mu m) were less affected by the rain event, and smaller phytoplankton appeared to outcompete larger cells after several days of rain. The surface (PN)-specific N uptake rates in the >8-mu m fraction decreased from 0.02 to 0.0001 h(-1), while the smaller fraction only exhibited a one-to threefold decrease after the rainfall. In contrast, bacterial production and N uptake were not affected by the rain event, and bacteria N uptake accounted for 10-60% of the total N uptake by phytoplankton.
语种: 英语
WOS记录号: WOS:000300771500023
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10279
Appears in Collections:热带海洋环境国家重点实验室(LTO)_期刊论文

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Yuan, XC; Glibert, PM; Xu, J; Liu, H; Chen, MR; Liu, HB; Yin, KD; Harrison, PJ.Inorganic and Organic Nitrogen Uptake by Phytoplankton and Bacteria in Hong Kong Waters,ESTUARIES AND COASTS,2012,35(1):325-334
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