13475.近百年來江西洪湖沉積環(huán)境變化研究

1、學位論文獨創(chuàng)性聲明本人鄭重聲明：所提交的學位論文是本人在導師指導下進行的研究工作和取得的研究成果。本論文中除引文外，所有實驗、數據和有關材料均是真實的。本論文中除引文和致謝的內容外，不包含其他人或其它機構已經發(fā)表或撰寫過的研究成果。其他同志對本研究所做的貢獻均已在論文中作了聲明并表示了謝意。學位敝作者簽名：猶珥耳日期：礎莎學位論文使用授權聲明鬻者簽搿y簽熹祭日期：上好日其目：足落＼。Abstract———————————————————

2、———————————————————————一一AbstractInthedissertation，HonghuLakeoftheJiangxiProvincewaschosenasstudvareaThemoderndepositionratewasanalyzedwiththemassdepthtodiscusst11eenvironmentalsignificanceofsedimentparticlesizeonashortt

3、imescaleThehistorynutrientspollutionindifferentstageswascompared，Theheavymetalpollutionwasevaluatedbythegeo’accumulationindex，enrichmentcoefficientmethodont11ebasisofaccuratechronologiesby2ⅢPbcxTilemainresultswereshownas

4、foilows：(1)The1。7Csand210Pbexactivitieswasdifferent，theorderof137CsisnotgoodThedissertationuse210PbextodatingWhenusing2’oPbexdatingmethodstoevaiuatevthemodernsedimentationratesofthestudylake，alittledeviationwasexistedexp

5、lainingthepossiblereasonsindifferentstages(2)TheparticlesizecharacteristicsofHonghuLakeindicate：Honghuisasiltvlake，particlesizefollowsdisciplinarianthatsedimentgrainsizegraduallydecreasesfromthelakeshoretothemiddleoflake

6、Theparticlesizeincreasedmainlvbvthecoarseparticlessubstanceinput(3)ThevalueofToe，TNandTPindicated：Frommid1950snutrientshasapromptlyincreasingtrendandgreaterfluctuationchangeThechangesofnutrientsinthetw0columncoreshowntha

7、tduetoacceptmorenitrogenlongtime，thecontentofTNintheHHAisfargreaterthantheHHBComparedwithHHB，thepollutionofHH—AismoreseriousThevariationcharacteristicsofToe，TN，TPN／Pandthepossiblereasonswereanalyzedindifferentenvironment

8、alstagesinthelasthundredyears(4)ThechangesofC／Nand8J3Cillustratedthelakeismainlyaquaticorganisms，sourceoforganicmatterisforthefloatingplants(5)Thefindthatrelativetootherheavymetalelements，thecontentofCdishighestTheelemen

9、tsofCu，PbandCdhavepresenteddiH奄rentdegreepollutionHonghuLakehasbeensubjectedtoheavymetalpollutionofCdi11thepast150years，andinrecentyears，thepollutionofCdwasaggravatedContentchangesofCuandPbhavebeeninnopollutiondegree，Hon