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ID:31965463
大小:2.95 MB
页数:67页
时间:2019-01-29
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1、浙江师范人学硕I:学位论义ACCUMULATl0NANDB10LOGICALCYCLEOFSEVARALMENTALSINsp.alternifloraVEGETATIONABSTRACTWetlandisanaturalsythesiswithparticularlocationthatisbetweenoceanandland,itisalsoaveryhigh—productuveecosysteminnature.Wetlandplaysanon。substitutedroleinsourceself-restraint、withsta
2、ndingflood、controllingpollution.Thebiogeochemistryprocessintidalflatisverycomplicatedinthatfrequentexchangeofchemicalmaterialswithadjacentecosystem.Macrophytesinwetlandplayanimportandpartinbiogeochemistry,Whichalwaysabsorballkindsofelementsfromthesediment,water,andair,includ
3、ingplantnutrientandheavymentals.Elementcontentsinthesedimentalsoaffectelementcycleinecosystem.Asoneoftheimportantissuesoftheglobalelementscycle,nutrientandheavymentalscycleinwetlandisanissueforecologistallthetime.Theresearchonthecharacteristicsoftheseelementsinwetlandcancont
4、ributetowetlandsystemresearchandsupplythebasisforprotectingwetlandaswellasrebuildingdegenerativewetland.However’asahigh.productiveplantintidalflat,elementcycleinSp.alternifloracommunityisstilllimiteduptothepresent.ThedissertationwassupportedbyNaturalScienceFoundationofZhejia
5、ngProvince:‘‘StudyontidalflatdikingaffectwetlandsystemandIV浙江师范人学硕l:学位论义dikingpatterninZhejiangProvince”.Sevaraltypicalsp.ahernifloracommunitiesoftidalflatinWenzhouwerechosen(Sp.alternifloraissoledominantplant).Sedimentandtheplant(aboVegroundpartandroot)werecollectedrespecti
6、velyinAugust,2005,November,2005,April,2006andJannury,2007.AccordingtOfieldworkandindoorexperiments,theresearchfocusonseasonalbiomassdynamicsofabovegroundpartandroot,aswellasconcentrationandcontentseasonaldynamicsofK、Ca,Na,Mg,Pb,Cr,Cu,Znindifferentpart.Eightelememtsconcentrat
7、ionseasonaldynamicsinsoilandthecirclecharacteristicofelementsinecosystemareanalyzed..Accordingtodifferentcirclecharacteristicofeightelememts,wesearchaftereffectiveapproachtOfatheringandmakinguseofwe、tland.Majorconclusionsfromtheresearchareasfollows:I、Duringgrowthseasonsofsp.
8、alterniflora,bothabovegroundpartandroothavemorehighbiomass.Infourseasons,ab
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