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

	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
	2004-06-01
发表期刊	GEOCHIMICA ET COSMOCHIMICA ACTA
ISSN	0016-7037
卷号	68 期号:12 页码:2681-2691
文章类型	Article
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.
关键词	Chesapeake Bay Chemical Characteristics Marine Environments Delaware Estuary Compound Classes Pacific-ocean Amino-acids Biochemical-composition Mass-spectrometry Atlantic Bight
学科领域	Geochemistry & Geophysics
DOI	10.1016/j.gca.2004.01.004
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000221922900006
引用统计	被引频次：17[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/2752
专题	海洋生态与环境科学重点实验室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.

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