南海深海盆表层沉积物氮的地球化学特征与生态学功能

郑国侠; 宋金明; 孙云明; 戴纪翠

南海深海盆表层沉积物氮的地球化学特征与生态学功能

1.
中国科学院海洋研究所, 山东青岛 266071;中国科学院研究生院, 北京 100039
2.
中国科学院海洋研究所, 山东青岛 266071

基金项目: 国家重点基础研究发展规划项目(2007CB407305);中国科学院"百人计划"(科人2003-202);青岛市科技将才专项计划(04-3-JJ-03,05-2-JC-90)

计量
- 文章访问数: 852
- HTML全文浏览量: 18
- PDF下载量: 988
- 被引次数: 0
出版历程
- 收稿日期: 2005-09-12
- 修回日期: 2006-06-08

Geochemical characteristics and ecological functions of nitrogen in the abyssal basin surface sediments, South China Sea

1.
Institute of Oceanology,Chinese Academy of Sciences, Qingdao 266071, China;The Graduate School, Chinese Academy of Sciences, Beijing 100039, China
2.
Institute of Oceanology,Chinese Academy of Sciences, Qingdao 266071, China

摘要

摘要: 研究了南海深海盆区域(南沙海槽西南部)表层沉积物中氮的形态、分布及其在生物地球化学循环中的功能.研究表明,表层沉积物中不同形态氮的含量不同.其中,氧化还原转化态的氮(SOEF-N)含量最高,平均为68.3μg/g,占总氮(TN)的7.08%;弱酸转化态氮(WAEF-N)含量最小,仅占总氮(TN)的1.09%.离子交换态(IEF-N),WAEF-N,S OEF-N及TN的地球化学分布特征存在一定相似性:均由海槽东西两侧向中央递增,并在槽底呈高含量分布;SAEF-N(强碱转化态)分布则与该趋势相反.IEF-N,SAEF-N和SOEF-N的分布主要受沉积物中有机碳含量(OC)控制;而WAEF-N则与碳酸盐(CaCO₃)存在显著的负相关关系;TN与OC不具有显著意义的相关,间接说明二者来源的不同.同时,各形态氮的分布还与沉积物粒度类型密切联系.此外,研究区域内由沉积物提供的氮源很大程度上补偿了浮游植物对水体中营养盐的消耗,对维持该海域的初级生产力水平起到一定作用.其中,IEF-N和SOEF-N的释放对浮游植物生长及初级生产力的贡献较为显著.
- 氮的形态 /
- 地球化学特征 /
- 表层沉积物 /
- 南海深海盆区域
Abstract: The abyssal basin of the South China Sea(southwestern Nansha Trough),one of the most productive areas of the southern South China Sea,is a typical semi-deep sea area and forms the transition from the shoal water zone to the abyssal zone.In order to underst and the roles and distributions of nitrogen in the biogeochemical cycling in this area,the quantities of various nitrogen forms and total nitrogen content(TN) in surface sediments were experimentally quantified during a cruise in April-May 1999.The quantities of various nitrogen forms in surface sediments of the study area were different:nitrogen in ion exchangeable form(IEF-N) 11.4~35.8μg/g,nitrogen in weak acid extractable form(WAEF-N) 4.4~23.1μg/g,nitrogen in strongal kali extractable form(SAEF-N) 10.4~29.3μg/g and nitr ogen in strong oxidation extractable form(SOEF-N) 15.4~218.3μg/g.The distribution characteristics of the various nitrogen forms(except SAEF-N) and T N were to some extent similar with the relatively low nitrogen contents observed on the Kalimant an continental slope(KCS) in the east and Nansha oceanic plateau(NOP) in the west of the study area,thus for ming high values in the trough area.It was controlled by organic carbon contents(OC) and carbonate contents(CaCO₃) in sediments as well as by the sediment grainsize.Four forms of extract able nitrogen in surface sediments could be released and participated in biogeochemical recycling.When all the four forms of extractable nitrogen were released to take part in recycling,IEF-N and SOEF-N were the predominant contributors to phytoplankt on and primary productivity in water column.
- forms of nitrogen /
- geochemical characteristics /
- surface sediments /
- abyssal basin of the South China Sea

HTML全文

参考文献(25)

罗又郎,苏广庆,陈绍谋,等.南沙群岛及其邻近海区沉积图集[M].武汉:湖北科学技术出版社,1993.55-69.

马红波,宋金明,吕晓霞,等.渤海沉积物中氮的形态及其在循环中的作用[J].地球化学,2003,32(1):48-54.

DENIS L,GRENZ C,ALLIOT E,et al.Temporal variability in dissolved inorganic nitrogen fluxes at the sediment-water interface and annual budget on a continental shelf(NW Mediterranean)[J].Oceanology Acta,2001,24(1):85-97.

沈志良,陆家平,刘兴俊.黄河口附近海区沉积物间隙水中的营养盐[J].海洋学报,1991,13(3):407-411.

WILLIAN J U,ARMAND B.Dissolved nutrient fluxes from the nearshore sediments of Bowling Green Bay,Central Great Barrier Reef Lagoon(Australia)[J].EstuarineCostal and Shelf Science,1987,24:89-303.

L(U) Xiao-xia,SONG Jin-ming,LI Xue-gang,et al.Geochemical characteristics of nitrogen in the southern Yellow Sea surface sediments[J].Journal of Marine System,2005,56:17-27.

宋金明.中国近海生物地球化学[M].济南:山东科技出版社,2004.227-529.

古森昌,陈忠,颜文,等.南沙海槽区表层沉积物的地球化学特征[J].海洋地质与第四季地质,2001,21(2):43-47.

BLACKBURN T H,HENRIKSEN K.Nitrogen cycling in different types of sediments from Danish Waters[J].Limnology and Oceanography,1983,28(3):477-493.

陈忠,古森昌,颜文,等.南沙海槽南部海区表层沉积物的碳酸盐沉积特征[J].海洋学报,2002,24(5):141-146.

KUL T C W,WALTER L M,COLEMAN M L,et al.Coupling between sulfur recycling and syndepositional carbonate dissolution:evidence from oxygen and sulfur isotope composition of pore water sulfate,South Florida Platform,U.S.A.[J].Geochimica et Cosmochimica Acta,1999,63(17):2 529-2 546.

MORTIMER C H.Chemical exchanges between sediments and water in the Great Lakes-speculations on probable regulatory mechanisms[J].Limnology and Oceanography,1971,16:387-404.

BREZONIK P L.Nitrogen:Sources and transformationsin naturalwaters[A].Nutrients in naturalwaters[C].New York:Wiley,1972.1-50.

古森昌,颜文,陈忠,等.南沙海槽南部表层重砂矿物及其成矿远景[J].海洋地质与第四季地质,2003,23(1):13-18.

BALZCR W.Organic matter degradation and biogenic element cycling in a nearshore sediment(Kicl Bight)[J].Limnology and Oceanography,1984,29(6):1 231-1 246.

尹延鸿,孙嘉诗,曲高生.东太平洋地区573孔始新世末-渐新世初地层矿物学[J].海洋地质与第四季地质,2000,20(1):13-22.

鲍根德.太平洋西部深海沉积物中有机质、氮、磷的初步研究[J].沉积学报,1987,5(1):114-124.

MILLIMAN J D,HU Dun-xing.Tidal phase control of sediment discharge from the Yangtze River?[J].Estuarine,Coastal and Shelf Science,19(1):119-128.

钱君龙,王苏民,薛滨,等.湖泊研究中一种定量估算陆源有机碳的方法[J].科学通报,1997,42:1 655-1 657.

贾国东,彭平安,傅家谟.珠江口近百年来富营养化加剧的沉积记录[J].第四纪研究,2002,22(2):158-165.

吴时国,涂霞,罗又郎,等.南沙群岛海区有机碳沉积作用与古生产力估算[J].热带海洋学报,1995,4(14):58-66.

黄良民,尹建强,陈清潮.南沙群岛海区初级生产力和浮游动物研究10年[A].南沙群岛海区生态过程研究(一)[C].北京:海洋出版社,1997.133-149.

唐质灿.南沙群岛海区陆架单列羽螅组合及生态地理学研究[A].南沙群岛及其临近海区海洋生物研究论文集(二)[C].北京:海洋出版社,1991.255-261.

CHEN Lee Yuh-ling,SHIAH F K.Distribution and downward flux of Trichodesmium in the South China Sea as influnce by transportfrom the Kuroshio Current[J].Marine Ecology Progress Series,2003,259:47-57.

CHEN Lee Yuh-ling.Spatial and seasonal variations of nitrate-based new production and primary production in the South China Sea[J].Deep Sea Research Part Ⅰ:Oceanographic Research Papers,2005,5(2):319-340.

施引文献

资源附件(0)

访问统计