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1、苏州河上游河岸缓冲带植被的研究(2)Level1IriparianstripsincludeZhaotun,Baihe,UpstreamDongfenggang,andHuajiangRoad,whichhavebasicallysteadycommunitystructureandcomparativelyaffluentspecies；and(3)LevelIIIripananstripsinclude从TandHuangdu，ofwhichtheformerpertainstonaturalstripswithrandoml
2、ygrowingruderalsduetolackofmaintenance，whilethelatterisa“GreenCorrider"wimcomparativelylowamountsofvegetationspeciesandrlarrowstripbandwidth．However,№providesadviceonselectionoflocalspeciesandvegetationpatternsandHuangdu,theonlyartificialsamplingpointwithabundantgrass
3、coveringland，suggestsreasonableconununitystructureforthereference．Besides，ThesisanalyzedanddelineatedthelandusetypesintheupstreamregionsofSuzhouCreekintermsoftheInvestigationandaerialphotographs，andevaluatedthegrasslandresearchandvegetationpatternexperimentsundertaken
4、intheexperimentalareaatDongfenggang．Accordingtoresearchfindings,Thesisfinallyputforwardsuggestionsapplicableforestablishingandrestoringriparianbufferstrips，includingthespeciesselection,collocation,thebandwidthdeterminationaswellasthemaintenanceandmanagementfortheripar
5、ianbufferstrips．Altogetherwithfirst-handdataandresultsobtainedintheInvestigation,andthefruitsandexperiencesummarizedinDongfenggangexperiments,ThesisraisedthecomprehensiveproposalandpossibleplanningforbuildingvegetationalongthesuburbanriverbanksofupstreamregiORSofSuzho
6、uCreek,suchastheadviceonintroducingarbor,shrub,grassandhyarophytetoformcomplicatedcommunitystructuresandtherequirementsonjudgingandchoosingappropriateplantspecies,specificallydiscussedthedesignprinciplesandspeciesselectionforthreedistinctivetypesof印arianstrips，namelyn
7、aturalriparianbufferstripsclosetofarmland，man-maderiparianbufferstripsclosetoroads，andman-maderiparianbufferstirpsforlandscapeusage．Keywords：SuzhouCreek,upstreamregions，却adanbufferstrips,vegetationpattern,indexsystem．6．苏州河上游河岸缓冲带植被的研究1前言1．1研究背景和意义1．1．1研究背景近一个世纪以来，随着人口
8、的激增和工农业生产的发展，河流生态系统，特别是河岸带生态系统由于受人类活动的干扰而严重退化。全球20％以上的河岸带植被已不复存在，剩余部分也在迅速消失。退化河岸带往往造成植被破坏、生物多样性下降、小气候恶化、河床及河岸遭受侵蚀、洪涝灾害频繁，严重威
