30506.洪湖養(yǎng)殖區(qū)水生植物種子庫現(xiàn)狀及水生植被恢復(fù)策略研究

1、華中師范大學(xué)碩士學(xué)位論文洪湖養(yǎng)殖區(qū)水生植物種子庫現(xiàn)狀及水生植被恢復(fù)策略研究姓名：丁小青申請學(xué)位級別：碩士專業(yè)：微生物學(xué)指導(dǎo)教師：楊劭20090501⑨碩士學(xué)位論文MASTER’STHESISAbstractLakeHonghuisthelargestlakeinHubeiProvinceandoncehadthesamewaterlevelcyclewiththeYangtzeRiverButnOWithasbeenchangedint

2、otheshallowlakebecauseoftheartificialcontrolofwaterlevelIthasgreatchangesbetweentheinterannualsandwithinoneyearLakeHonghuhasthegoodnameoflandoffishandrice，whichhasallimportantroleineconomyHoweverLakeHonghuhasbeguntohavel

3、arge—scaleaquaculturesince1990IthascausedseriousdamagetowaterecologyThewaterqualityhasatrendofseriouseutrophicationandfishstocksaredepletedInordertoprotecttheecologyofLakeHonghuandstudyofaquaticvegetationrestorationstrat

4、egies，wehavechosenatypicalfarmingregiontohavetheconventionalsurveyofaquaticvegetation，waterqualitysurveyzooplanktonsurveyseedbanksurveynaturalrecoverytestTheresultsastbllows：(1)Thereareseldomwatersubmergedplantsinexperim

5、entalregionofaquaculture，onlyhaveallextremelysmallnumberofwaterplantslikereeds，wildricegrassandsomefloating—leavedlotus，hardlytofindotherlargetypeplants(2)WaterqualityistheIIIdegreeonexperimentalsite，trophicationlevelism

6、ild，andtrophicationleveloftransparencyreachestomoderateWaterqualityhasasignificantdifferenceofexperimentalsiteonebetween2007and2008(3)ThenumberofzooplanktonisthepeakoftheyearfromMaytoOctoberthequantityis93ind／L～2607ind|L

7、，andtheamountofzooplanktonhasasignificantdifferenceduringtwoperiods(4)Sedimentseedbankshave14kindsofaquaticplantswithanaveragedensityof4674345ind／mz(5)Naturalrecoverytestshave5and14kindsofaquaticplantsrestoration，thecove

8、ragereachesto100％and30％respectivelyStudyshowsthat：(1)densityofherbivorousfishisSOlargethataquaticvegetation，especiallysubmergedvegetationbeginssuccessiontodisappearance；densityoffilterfeedingfishisSOlargethatitdirectlyca

9、usesthedeclineofthetotalnumberofzooplanktons，smallerindividuals，thereductionoftypes；densityofamountoffishisSOlargethatitdirectlycausesthedeclinetransparencyofshallowwaterdeteriorationofwaterquality(2)Overbreedingisthemai

10、nfactorforthedegradationofaquaticvegetationandmainlimitingfactorforrecoveryandifwechangethetypesandamountoffishundertheconditionsoftheexistingwaterqualitytheaquaticvegetationCanberecoveredKeywords：LalkeHonghuwetland；wate