呼伦湖沉积物有机碳的分布特征.pdf

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1、农业环境科学学报2011,30(11)-2336-2340JournalofAgro—EnvironmentScience呼伦湖沉积物有机碳的分布特征宋文杰1，何江1∥，高际玫3，吕昌伟1，一，王维1’2，樊明德1’2，张家震1,2(1．内蒙古大学环境与资源学院，呼和浩特010021；2．内蒙古大学环境地质研究所，呼和浩特010021；3．内蒙古环境监测中心站，呼和浩特010011)摘要：以内蒙古高原湖泊呼伦湖为对象，开展了湖泊沉积物有机碳的分布特征研究。结果表明：呼伦湖沉积物中总有机碳(TOC)含量范围为9．18～61．68g·kg，平均34

2、．64g·kg。1；重组碳(HFOC)含量范嗣为9．02-61．47g·kg～，平均34．32g·kg。1；轻组碳(LFOC)含量范围为O．02—0．86g·kg～，平均0．32g·kg～。TOC在空间分布I：呈现从北西向南东逐渐递减的趋势。表层沉积物中C／N的平均值为20．35，表明呼伦湖中有机质的多源性。关键词：有机碳；分布；沉积物；湖泊中图分类号：X524文献标志码：A文章编号：1672—2043(2011)11-2336—05CharacteristicsofOrganicCarbonDistributionintheSedimento

3、fHulunhuLake，ChinaSONGWen-jiel，HEJian91·”，GAOJi-mei3，LUChang-weil⋯，WANGWeil'2FANMing-de“2ZHANGJia—zhenl’2(1．CollegeofEnvironmentandResources，InnerMongoliaUniversity，Huhhot010021，China；2．InstituteofEnvironmentalGeology，InnerMongoliaUniversity，Huhhot010021，China；3．InnerMongoli

4、aEnvironmentMonitoringCenterStation，Huhhot010011，China)Abstract：Thetotalorganiccarbon(TOC)playsanimportantroleincarboncycles．TOCcallbedividedintolight-fractionorganiccarbon(LFOC)andheavy-fractionorganiccarbon(HFOC)usingthedensityfraetionationtechniquerecently，LFOCconsistsofv

5、isiblepartlydecomposedplantmaterialatvariousstageofdecomposition，includesspore，seed，animalandmicrobialdebrisandsomesoilmineralspatti-cleassociatedwithplantdebris．Itisagoodindicatorforlabileorganiccarbon．AndHFOCconsistsofhumus，existingasstablecarbonp001．Thisstudywascarriedout

6、aboutthecharacteristicsorganiccarbondistributionsinthesedimentofHulunhulake，whichistheshallowlakeinaridareaswithintheMongolianPlateau．7I■eresultsindicatedthatthecontentofTOCrangedfrom9．18to61．68g·kg～．withtheaverageof34．64g‘kg一1；thecontentofHFOCrangedfrom9．02to61．47g·kg，witht

7、heaverageof34．32g-kg一1；andthecontentofLFOCrangedfromO．02to0．86g·kg-1．withtheaverageof0．32g‘kg～．7I'hecontentofTOCshowedadecreasingtrendfromnorthwesttosoutheastinspatialdis-tribution．ThemeanC／Nratioofthesedimentwas20．35inthesurfacesedimentsofHulunhulake．WhichmeantthattheSOUI'C

8、Coforganicmatterwasdiverse．Keywords：organicearbon：distributions；sediment；la