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C/N是一种传统的区分海洋沉积有机质来源的指标,基于总有机碳与总有机氮的比值。BIT(Branched andIsoprenoid Tetraether index)和TMBR(Terrestrial and Marine Biomarker Ratio)是近年提出的用于指示陆源有机质相对贡献的新指标,二者具有明确的陆源及海源端元值。BIT指标是基于陆地土壤厌氧细菌生标Branched GDGTs与泉古菌生标Crenarchaeol的比值,TMBR指标是基于陆源高等植物生标和海源藻类生标的比值。本文利用C/N、BIT和TMBR指标,对济州岛西南泥质区DH11站位过去一百年以来陆源有机质和海源有机质的相对贡献进行了定量评估。总有机碳(TOC)、陆源和海源生物标志物的分析结果显示:近50a来,该站位的总有机质、海源有机质和陆源有机质的沉积通量(Mass Accumulation Rates,MARs)一直在增加。C/N指标通过二元混合模型的计算结果显示陆源有机质占总沉积有机质的比例在0.22～0.30之间,BIT与TMBR指示的陆源有机质贡献分别在0.05～0.11,0.08～0.22之间,所得相对贡献的差异主要是由不同指标的指示意义不同造成的。3种指标的结果表明该研究海域海源有机质在沉积有机质中占据主导地位。另外,从1950s开始陆源有机质的相对贡献呈现下降趋势,这说明海源有机质沉积通量增加的比例大于陆源有机质,这可能是由东亚季风、黑潮、河流输入、大气沉降和人类活动等多重因素引起的。
Abstract：C/N ratio of total organic matter is a traditional indicator for distinguishing organic matter sources,while both BIT(Branched and Isoprenoid Tetraether index) and TMBR(Terrestrial and Marine Biomarker Ratio) are new proxies for calculating relative contributions of terrestrial organic matter(TOM) and marine organic matter(MOM) in marine sediments.In this paper,these indicators are applied to evaluate the contributions of TOM and MOM during the past 100 years for site DH11 located in the Mud Area Southwest off Cheju Island.The mass accumulation rates(MARs) records of total organic carbon(TOC),terrestrial and marine biomarkers reveal a relatively stable trend of sedimentary organic matter before 1950s and an increasing trend of buried organic matter after the 1950s.The calculated TOM contribution using a binary mixture model based on C/N ratios varies from 0.22 to 0.30.The range of TOM contribution based on BIT and TMBR indices is 0.05 to 0.11 and 0.08 to 0.22,respectively.The differences of TOM contribution could be attributed to different sources of organic matters used in these indices.In addition,low TOM contributions indicate that MOM plays dominant role in sedimentary TOC at site DH11.The values of C/N ratio,BIT and TMBR indices were decreasing since 1950s,suggesting reduced TOM contribution,which is related to the larger increasing amplitude of MOM than TOM.Strengthened East Asian Winter Monsoon and Kuroshio and increased nutrient inputs could cause the increasing MOM contribution for site DH11 during the past 50 years.
[1]Hedges J I,Keil R G.Sedimentary organic matter preservation:an assessment and speculative synthesis[J].Marine Chemistry,1995,49(2-3):81-115.
[2]Xing L,Zhang H,Yuan Z,et al.Terrestrial and marine biomark-er estimates of organic matter sources and distributions in surface sediments from the East China Sea shelf[J].Continental Shelf Research,2011,31(10):1106-1115.
[3]Kao S J,Lin F J,Liu K K.Organic carbon and nitrogen contents and their isotopic compositions in surficial sediments from the East China Sea shelf and the southern Okinawa Trough[J].Deep Sea Research Part II:Topical Studies in Oceanography,2003,50(6-7):1203-1217.
[4]Wu Y,Zhang J,Liu S M,et al.Sources and distribution of car-bon within the Yangtze River system[J].Estuarine,Coastal and Shelf Science,2007,71(1-2):13-25.
[5]Zhu C,Xue B,Pan J,et al.The dispersal of sedimentary terres-trial organic matter in the East China Sea(ECS)as revealed by bi-omarkers and hydro-chemical characteristics[J].Organic Geo-chemistry,2008,39(8):952-957.
[6]Zhu C,Wang Z H,Xue B,et al.Characterizing the depositional settings for sedimentary organic matter distributions in the Lower Yangtze River-East China Sea Shelf System[J].Estuarine,Coastal and Shelf Science,2011,93(3):182-191.
[7]郭志刚,杨作升,陈致林,等.东海陆架泥质区沉积有机质的物源分析[J].地球化学,2001,30(5):417-424.
[8]朱纯,潘建明,卢冰.长江、老黄河口及东海陆架沉积有机质物源指标及有机碳的沉积环境[J].海洋学研究,2005,23(3):36-46.
[9]Philip A M.Organic geochemical proxies of paleoceanographic,paleolimnologic,and paleoclimatic processes[J].Organic Geo-chemistry,1997,27(5-6):213-250.
[10]Perdue E M,Koprivnjak J F.Using the C/N ratio to estimate terrigenous inputs of organic matter to aquatic environments[J].Estuarine,Coastal and Shelf Science,2007,73(1-2):65-72.
[11]Weijers J W H,Schouten S,Spaargaren O C,et al.Occurrence and distribution of tetraether membrane lipids in soils:Implica-tions for the use of the TEX 86 proxy and the BIT index[J].Or-ganic Geochemistry,2006,37(12):1680-1693.
[12]Hopmans E C,Weijers J W H,Schefu E,et al.A novel proxy for terrestrial organic matter in sediments based on branched and isoprenoid tetraether lipids[J].Earth and Planetary Science Let-ters,2004,224(1-2):107-116.
[13]Sinninghe Damsté,Schouten S,Hopmans E C,et al.Crenar-chaeol:the characteristic core glycerol dibiphytanyl glycerol tet-raether membrane lipid of cosmopolitan pelagic crenarchaeota[J].Journal of Lipid Research,2002,43(10):1641-1651.
[14]Walsh E M,Ingalls A E,Keil R G.Sources and transport of ter-restrial organic matter in Vancouver Island fjords and the Van-couver-Washington Margin:A multiproxy approach usingδ13 C org,lignin phenols,and the ether lipid BIT index[J].2008,53(3):1054-1063.
[15]Kim J H,Ludwig W,Schouten S,et al.Impact of flood events on the transport of terrestrial organic matter to the ocean:Astudy of the Têt River(SW France)using the BIT index[J].Organic Geochemistry,2007,38(10):1593-1606.
[16]Kim J H,Schouten S,Buscail R,et al.Origin and distribution of terrestrial organic matter in the NW Mediterranean(Gulf of Li-ons):Exploring the newly developed BIT index[J].Geochem Geophys Geosyst,2006,7(11):Q11017,doi:10.1029/2006GC001306.
[17]Milliman J D,Beardsley R C,Yang Z S,et al.Modern Huanghe-derived muds on the outer shelf of the East China Sea:identifica-tion and potential transport mechanisms[J].Continental Shelf Research,1985,4(1-2):175-188.
[18]Youn J,Kim T J.Geochemical composition and provenance of muddy shelf deposits in the East China Sea[J].Quaternary In-ternational,2011,230(1-2):3-12.
[19]郭志刚,杨作升,曲艳慧,等.东海陆架泥质区沉积地球化学比较研究[J].沉积学报,2000,18(2):284-289.
[20]郭志刚,杨作升,林田,等.东海泥质区单体正构烷烃的碳同位素组成及物源分析[J].第四纪研究,2006,26(3):384-390.
[21]Guo Z,Lin T,Zhang G,et al.High-resolution depositional re-cords of polycyclic aromatic hydrocarbons in the central continen-tal shelf mud of the East China Sea[J].Environmental Science&Technology,2006,40(17):5304-5311.
[22]Hopmans E C,Schouten S,Pancost R D,et al.Analysis of in-tact tetraether lipids in archaeal cell material and sediments by high performance liquid chromatography/atmospheric pressure chemical ionization mass spectrometry[J].Rapid Communica-tions in Mass Spectrometry,2000,14(7):585-589.
[23]Robinson N,Eglinton G,Brassell S C,et al.Dinoflagellate ori-gin for sedimentary4α-methylsteroids and5α(H)-stanols[J].Nature,1984,308(5958):439-442.
[24]Schubert C J,Villanueva J,Calvert S E,et al.Stable phyto-plankton community structure in the Arabian Sea over the past 200,000years[J].Nature,1998,394(6693):563-566.
[25]Volkman J K,Barrett S M,Blackburn S I,et al.Microalgal bio-markers:A review of recent research developments[J].Organic Geochemistry,1998,29(5-7):1163-1179.
[26]Volkman J K,Eglinton G,Corner E D S,et al.Long-chain al-kenes and alkenones in the marine coccolithophorid Emiliania huxleyi[J].Phytochemistry,1980,19(12):2619-2622.
[27]Marlowe I T,Green J C,Neal A C,et al.Long chain(n-C 37 C 39)alkenones in the Prymnesiophyceae.Distribution of alk-enones and other lipids and their taxonomic significance[J].British Phycological Journal,1984,19(3):203-216.
[28]Zimmerman A R,Canuel E A.A geochemical record of eutrophi-cation and anoxia in Chesapeake Bay sediments:anthropogenic influence on organic matter composition[J].Marine Chemistry,2000,69(1-2):117-137.
[29]Canuel E A,Martens C S.Reactivity of recently deposited organ-ic matter:Degradation of lipid compounds near the sediment-wa-ter interface[J].Geochimica et Cosmochimica Acta,1996,60(10):1793-1806.
[30]Schubert C J,Calvert S E.Nitrogen and carbon isotopic composi-tion of marine and terrestrial organic matter in Arctic Ocean sedi-ments::implications for nutrient utilization and organic matter composition[J].Deep Sea Research Part I:Oceanographic Re-search Papers,2001,48(3):789-810.
[31]熊林芳.南黄海-东海北部悬浮体与表层沉积物有机碳有机碳分布特征[研究生毕业论文][D].青岛:国家海洋局第一研究所,2010.
[32]熊林芳,刘季花,白亚之,等.南黄海与东海北部春季春季悬浮体颗粒有机碳分布[J].海洋地质与第四纪地质,2010,30(3):7-14.
[33]Weijers J W H,Schouten S,Schefu?E,et al.Disentangling ma-rine,soil and plant organic carbon contributions to continental margin sediments:A multi-proxy approach in a20,000year sedi-ment record from the Congo deep-sea fan[J].Geochimica et Cosmochimica Acta,2009,73(1):119-132.
[34]Rueda G,Rosell-Mel A,Escala M,et al.Comparison of instru-mental and GDGT-based estimates of sea surface and air tempera-tures from the Skagerrak[J].Organic Geochemistry,2009,40(2):287-291.
[35]徐建军,朱乾根,周铁汉.近百年东亚冬季风的突变性和周期性[J].应用气象学报,1999,10(1):1-8.
[36]郭志刚,杨作升,雷坤,等.东海陆架北部泥质区沉积动力过程的季节性变化[J].青岛海洋大学学报,1999,29(3):507-513.
[37]郭志刚,杨作升,张东奇,等.冬、夏季东海北部悬浮体分布及海流对悬浮体输运的阻隔作用[J].海洋学报,2002,24(5):71-79.
[38]丁瑞强,王式功,尚可政.近45a我国沙尘暴和扬沙天气变化趋势和突变分析[J].中国沙漠,2003,23(3):306-310.
[39]Chen Y-L L,Chen H Y,Chung C W.Seasonal variability of coc-colithophore abundance and assemblage in the northern South China Sea[J].Deep Sea Research Part II:Topical Studies in O-ceanography,2007,54(14-15):1617-1633.
[40]Falkowski P G,Oliver M J.Mix and match:how climate selects phytoplankton[J].Nat Rev Micro,2007,5(10):813-819.
[41]邢磊,赵美训,张海龙,等.二百年来黄海浮游植物群落结构变化的生物标志物记录[J].中国海洋大学学报:自然科学版,2009,39(2):317-322.
[42]陈莹,庄国顺,郭志刚.近海营养盐和微量元素的大气沉降[J].地球科学进展,2010,25(7):682-690.
[43]管秉贤.东海黑潮变异研究的若干结果[J].海洋与湖沼,1979,10(4):297-306.
[44]浦泳修,许小云.1972-1983年期间东海(PN断面)的黑潮流况[J].海洋学报,1986,8(1):14-20.
[45]Gao S,Wang Y P.Changes in material fluxes from the Changjiang River and their implications on the adjoining continen-tal shelf ecosystem[J].Continental Shelf Research,2008,28(12):1490-1500.
[46]Zhang S,Ji H,Yan W,et al.Composition and flux of nutrients transport to the Changjiang Estuary[J].Journal of Geographical Sciences,2003,13(1):3-12.
[47]Li M,Xu K,Watanabe M,et al.Long-term variations in dis-solved silicate,nitrogen,and phosphorus flux from the Yangtze River into the East China Sea and impacts on estuarine ecosystem[J].Estuarine,Coastal and Shelf Science,2007,71(1-2):3-12.
[48]Lin C,Ning X,Su J,et al.Environmental changes and the re-sponses of the ecosystems of the Yellow Sea during1976-2000[J].Journal of Marine Systems,2005,55(3-4):223-234.
[49]王克,王荣,左涛,等.长江口及邻近海区浮游动物总生物量分析[J].海洋与湖沼,2004,35(6):568-578.
[50]吴玉霖,傅月娜,张永山,等.长江口海域浮游植物分布及其与径流的关系[J].海洋与湖沼,2004,35(3):246-251.
[51]Zhou M J,Shen Z L,Yu R C.Responses of a coastal phyto-plankton community to increased nutrient input from the Changjiang(Yangtze)River[J].Continental Shelf Research,2008,28(12):1483-1489.
[52]Lohrenz S E,Fahnenstiel G L,Redalje D G,et al.Nutrients,ir-radiance,and mixing as factors regulating primary production in coastal waters impacted by the Mississippi River plume[J].Con-tinental Shelf Research,1999,19(9):1113-1141.
基本信息:
DOI：10.16441/j.cnki.hdxb.2013.02.007
中图分类号:P618.13
引用信息:
[1]葛田田,李大伟,赵宗山,等.过去一百年济州岛西南泥质区有机质来源变化的多参数指标研究[J],2013,43(02):40-47.DOI:10.16441/j.cnki.hdxb.2013.02.007.
基金信息:
国家重点基础研究发展计划项目(2010CB428901);; 国家重大国际(地区)合作研究项目(41020164005);; 国家自然科学青年基金项目(21007062)资助