Inorganic and Organic Nitrogen Uptake by Phytoplankton and Bacteria in Hong Kong Waters

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	Inorganic and Organic Nitrogen Uptake by Phytoplankton and Bacteria in Hong Kong Waters
	Yuan, XC ; Glibert, PM ; Xu, J ; Liu, H ; Chen, MR ; Liu, HB ; Yin, KD ; Harrison, PJ
刊名	ESTUARIES AND COASTS
	2012
卷号	35 期号:1 页码:325-334
关键词	N uptake Size-fractionated phytoplankton Bacteria Coastal waters Pearl River estuary
ISSN号	1559-2723
通讯作者	xcyuan@scsio.ac.cn
中文摘要	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.
学科主题	Environmental Sciences; Marine & Freshwater Biology
语种	英语
WOS记录号	WOS:000300771500023
公开日期	2013-08-28
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/10279]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
推荐引用方式 GB/T 7714	Yuan, XC,Glibert, PM,Xu, J,et al. Inorganic and Organic Nitrogen Uptake by Phytoplankton and Bacteria in Hong Kong Waters[J]. ESTUARIES AND COASTS,2012,35(1):325-334.
APA	Yuan, XC.,Glibert, PM.,Xu, J.,Liu, H.,Chen, MR.,...&Harrison, PJ.(2012).Inorganic and Organic Nitrogen Uptake by Phytoplankton and Bacteria in Hong Kong Waters.ESTUARIES AND COASTS,35(1),325-334.
MLA	Yuan, XC,et al."Inorganic and Organic Nitrogen Uptake by Phytoplankton and Bacteria in Hong Kong Waters".ESTUARIES AND COASTS 35.1(2012):325-334.