上海中心城區(qū)自然草本群落類型、分布及其季節(jié)變化規(guī)律研究.pdf

1、華東師范大學(xué)碩士學(xué)位論文上海中心城區(qū)自然草本群落類型、分布及其季節(jié)變化規(guī)律研究姓名：陳克霞申請學(xué)位級別：碩士專業(yè)：生態(tài)學(xué)指導(dǎo)教師：達(dá)良俊20050501AbstractThestudywascardedoutintheconstructedareaofShanghaiinspringandautumnrespectivelyThevegetationsurveywasconductedand107herbaceousspeciesfwh

2、ichbelongto32families89genera)weredetected，inwhich627percentareannualspecies(34speciesarewinterannualsand31speciesaresummerannuals)and373percentareperennialspecies31specieswerealienand76specieswerenaturalinShanghaiandreg

3、ionsaroundShanghai89generabelongto14arealtypesand5variablefypesTherearegreatdifferencebetweenspeciesofspringandautumnDominantspeciesappearinginspringonlywerealmostwinterannualsDominantspeciesappearinginautumnonlywerealmo

4、stsummerannualsDominantspeciesappeanngintwoseasonswerealmostperennialsAccordingtotheclusteringanalysis，34dominanttypescanbeclassified9typegroupscanbeclassifiedaccordingtoclassificationandordinationOnthediagramofDCAordina

5、tion，humandisturbanceweakenedalongtheaxis1ofDCAfromthelefttotherightMoistureweakenedalongtheaxis2ofDCAfrOmthelowertotheupperAccordingtotheclusteringanalysis，34dominanttypescanbeclassified16typegroupscanbeclassifiedaccord

6、ingtoclassificationandordinationOnthediagramofDCAordination，moisturestrengthenedandlightweakenedalongtheaxis1ofDCAfromthelefttotheright，humandisturbanceenhancedalongtheaxis2ofDCAfromthelowertotheupperExceptforthelight。mo

7、istureandhumandisturbancesuccessionwasalsoaneffecttolheformationandmaintenanceofweedcommunitiesCommunitiesinhabitatswithhighhumandisturbanceweredominatedbyannualsandperennialswhichcanenduretramplingCommunitiesinhabitatsw

8、ithouthumandisturbancewerealmostdominatedbyperennials5habitattypeswereinducedonthebasisoftypegroupsofspringandautumnTheywereedgehabitat，abandonedhabitatwithdebrisabandonedhabitatwithsoil，habitatwithshortIivedannualsandha

9、bitatwithspecieswhichcanenduretramplingAccordingtothehabitattypes，weedspeciescanbeinducedinto5speciesgroupsIntheedgehabitat，specieswerealmostperennialswhichcanenduredanknessInabandonedhabitatwithdebris，speciesweretallper

10、ennialsofCompositaeInabandonedhabitatwithsoil，specieswerealmostannualswhichcanendureleannessShort—livedspeciesappearedinspringinthehabitatwithhumandisturbancetakingnocareofenvironmenteffectsSpecieswhichcanenduretrampling