互花米草群落中金属元素的累积和循环特征

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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