滇池寶象河水庫沉積物碳氮分布特征及有機(jī)碳來源研究.pdf

1、學(xué)位論文獨創(chuàng)性聲明本人鄭重聲明：所提交的學(xué)位論文是本人在導(dǎo)師的指導(dǎo)下進(jìn)行的研究工作和所取得的研究成果。本論文中除引文外，所有實驗、數(shù)據(jù)和有關(guān)材料均是真實的。本論文不包含其他個人或機(jī)構(gòu)已經(jīng)發(fā)表或撰寫過的研究成果。對本文的研究做出重要貢獻(xiàn)的個人和集體，均已在文中作了說明并表示感謝。學(xué)位論文作者簽名：景俊El期：矽燁j諺學(xué)位論文使用授權(quán)聲明研究生在校攻讀學(xué)位期間論文工作的知識產(chǎn)權(quán)單位屬南京師范大學(xué)。學(xué)校有權(quán)保存本學(xué)位論文的電子和紙質(zhì)文檔，可以

2、借閱或上網(wǎng)公布本學(xué)位論文的部分或全部內(nèi)容，可以采用影印、復(fù)印等手段保存、匯編本學(xué)位論文。學(xué)校可以向國家有關(guān)機(jī)關(guān)或機(jī)構(gòu)送交論文的電子和紙質(zhì)文檔，允許論文本查閱和借閱。(保密論文在解密后遵守此規(guī)定)保密論文注釋：本學(xué)位論文屬于保密論文，密級：——保密期限為——年。作者簽名：锨指導(dǎo)教師簽名：Et期：少／‘|[j-諺日期：AbstractAbstractWatersedimentiStheaccumulationofvariousnutrien

3、tsandsourcedate，whichcantrulyreflectchangesinhkeenvironmentsandintensitiesforn詛n-madedisturbancesBytakingBaoxiangreservoirasthestudysite，twosedimentsampleswerecollectedinBaoxiangreservoir137Csand210Pbo(inventory,totalorg

4、aniccarbon(TOC)andtotalnitrogen(TN)concentration,C／N，stablecarbonisotope(613C)wereanalyzedInthispaper，137Csand210Pb。【datingtechniqueswereusedtodateverticalprofilesofcoresandthespathldistributionofTOC，TN，C／N，813Cinsedimen

5、tsandthegrainsizewerediscussed，carbonandnitrogenchangesinsedimentsplayanimportantroleindevebpmentoftheeutrophication,andprovidereferencetoimproveecobgicalenvironmentThemainresultsareasfollows：1137Csinsedimenthasobvbustim

6、escaleItsthreedistinctive137Cspeaksareoccurringin1963，1975，and1986Dueto1argesedimentaffectedbyexternalinterferencethe137Csdatingtechniqueismoreoftenusedthan210Pb烈210Pb鼠datingtechniquenormallyprovidessupplementaryinformat

7、ionfor137Csdatingmethods2ThelocationofsedimentsdeterminestheconcentmtbnofTOCandTN，withconcentrationofTOC，TNinsedimentBhigherthanthatinsedimentATheeutrophicationinthesedimentBofBaoxiangreservoircouldbeattributedtothedistu

8、rbanceofhumanactivitiesThedistrmutionofTOCinsedimentsiSobviouslyverticalTheconcentrationofTOCdecreaseswiththedeepeningoftheverticalprofileinspiteofoccasionalcurvesTheverticaldistributionofTNinsedimentsshowsnoobviouschang

9、esTheaveragegrainsizerangesfrom1422to13451gminthesedimentA，andfrom461to28949minthesedimentBGrainsizeforsedimentAiscoarser,poorsortingCoarsergrainsizereflectedthesedimentAofhydrodynamicconditionmaybestrongerthansedimentBT

10、herelativityanalysisofTOCcontentandgrainsizeofsediments，indicatedthattheconcentrationsoforganiccarboninthesedimentAweresignificantlyinfluencedbythegrainsizes，whileTOCcontentchangesinsedimentBweremainlyrehtedtohumanactivi