Stable carbon and nitrogen isotopic compositions of high molecular weight dissolved organic matter from four US estuaries

doi:10.1016/j.gca.2004.01.004

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	Stable carbon and nitrogen isotopic compositions of high molecular weight dissolved organic matter from four US estuaries
	Wang, XC; Altabet, MA ; Callahan, J ; Chen, RF
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
	2004-06-01
卷号	68 期号:12 页码:2681-2691
关键词	Chesapeake Bay Chemical Characteristics Marine Environments Delaware Estuary Compound Classes Pacific-ocean Amino-acids Biochemical-composition Mass-spectrometry Atlantic Bight
ISSN号	0016-7037
DOI	10.1016/j.gca.2004.01.004
文献子类	Article
英文摘要	High molecular weight dissolved organic matter (HMW-DOM) represents an important component of dissolved organic carbon (DOC) in seawater and fresh-waters. In this paper, we report measurements of stable carbon (delta(13)C) isotopic compositions in total lipid, total hydrolyzable amino acid (THAA), total carbohydrate (TCHO) and acid-insoluble "uncharacterized" organic fractions separated from fourteen HMW-DOM samples collected from four U.S. estuaries. In addition, C/N ratio, delta(13) C and stable nitrogen (delta(15)N) isotopic compositions were also measured for the bulk HMW-DOM samples. Our results indicate that TCHO and THAA are the dominant organic compound classes, contributing 33-46% and 13-20% of the organic carbon in HMW-DOM while total lipid accounts for only <2% of the organic carbon in the samples. In all samples. a significant fraction (35-49%) of HMW-DOM was included in the acid-insoluble fraction. Distinct differences in isotopic compositions exist among bulk samples, the compound classes and the acid-insoluble fractions. Values of delta(13)C and delta(15)N measured for bulk HMW-DOM varied from -22.1 to -30.1parts per thousand and 2.8 to 8.9parts per thousand, respectively and varied among the four estuaries studied as well. Among the Compound classes, TCHO was more enriched in C-13 (delta(13)C = -18.5 to -22.8parts per thousand) compared with THAA (delta(13)C = -20.0 to -29.6parts per thousand) and total lipid (delta(13)C = -25.7 to -30.7parts per thousand). The acid-insoluble organic fractions, in general, had depleted C-13 values (delta(13)C = -23.0 to -34.4parts per thousand). Our results indicate that the observed differences in both delta(13)C and delta(15)N were mainly due to the differences in sources of organic matter and nitrogen inputs to these estuaries in addition to the microbial processes responsible for isotopic fractionation among the compound classes. Both terrestrial sources and local sewage inputs contribute significantly to the HMW-DOM pool in the estuaries studied and thus had a strong influence on its isotopic signatures. Copyright (C) 2004 Elsevier Ltd.; High molecular weight dissolved organic matter (HMW-DOM) represents an important component of dissolved organic carbon (DOC) in seawater and fresh-waters. In this paper, we report measurements of stable carbon (delta(13)C) isotopic compositions in total lipid, total hydrolyzable amino acid (THAA), total carbohydrate (TCHO) and acid-insoluble "uncharacterized" organic fractions separated from fourteen HMW-DOM samples collected from four U.S. estuaries. In addition, C/N ratio, delta(13) C and stable nitrogen (delta(15)N) isotopic compositions were also measured for the bulk HMW-DOM samples. Our results indicate that TCHO and THAA are the dominant organic compound classes, contributing 33-46% and 13-20% of the organic carbon in HMW-DOM while total lipid accounts for only <2% of the organic carbon in the samples. In all samples. a significant fraction (35-49%) of HMW-DOM was included in the acid-insoluble fraction. Distinct differences in isotopic compositions exist among bulk samples, the compound classes and the acid-insoluble fractions. Values of delta(13)C and delta(15)N measured for bulk HMW-DOM varied from -22.1 to -30.1parts per thousand and 2.8 to 8.9parts per thousand, respectively and varied among the four estuaries studied as well. Among the Compound classes, TCHO was more enriched in C-13 (delta(13)C = -18.5 to -22.8parts per thousand) compared with THAA (delta(13)C = -20.0 to -29.6parts per thousand) and total lipid (delta(13)C = -25.7 to -30.7parts per thousand). The acid-insoluble organic fractions, in general, had depleted C-13 values (delta(13)C = -23.0 to -34.4parts per thousand). Our results indicate that the observed differences in both delta(13)C and delta(15)N were mainly due to the differences in sources of organic matter and nitrogen inputs to these estuaries in addition to the microbial processes responsible for isotopic fractionation among the compound classes. Both terrestrial sources and local sewage inputs contribute significantly to the HMW-DOM pool in the estuaries studied and thus had a strong influence on its isotopic signatures. Copyright (C) 2004 Elsevier Ltd.
学科主题	Geochemistry & Geophysics
URL标识	查看原文
语种	英语
WOS记录号	WOS:000221922900006
公开日期	2010-12-22
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/2753]
专题	海洋研究所_海洋生态与环境科学重点实验室海洋研究所_海洋生物技术研发中心
作者单位	1.Univ Massachusetts, Dept Environm Coastal & Ocean Sci, Boston, MA 02125 USA 2.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 3.Univ Massachusetts, Sch Marine Sci & Technol, New Bedford, MA 02744 USA
推荐引用方式 GB/T 7714	Wang, XC,Altabet, MA,Callahan, J,et al. Stable carbon and nitrogen isotopic compositions of high molecular weight dissolved organic matter from four US estuaries[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2004,68(12):2681-2691.
APA	Wang, XC,Altabet, MA,Callahan, J,&Chen, RF.(2004).Stable carbon and nitrogen isotopic compositions of high molecular weight dissolved organic matter from four US estuaries.GEOCHIMICA ET COSMOCHIMICA ACTA,68(12),2681-2691.
MLA	Wang, XC,et al."Stable carbon and nitrogen isotopic compositions of high molecular weight dissolved organic matter from four US estuaries".GEOCHIMICA ET COSMOCHIMICA ACTA 68.12(2004):2681-2691.