北方部分城市银杏树夏季焦叶影响因子的-研究

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1、StudyonthefactorsaffectingyellowleavesofGinkgobilobaL．inthenortherncitiesinSUmmerAuthor：LiXuanSupervisor：Prof．LiuGuilinMajor：LandscapePlantandOrnamentalHorticultureAbstractGinkgobilobaLhasgoodornamental、adaptable、fewerpesmanddiseases．Notonlycanpurifytheair，regulatingclimate，b

2、utalsocanimproveurbanculture，toenhancethetasteofthecity．Andithasthereforebecomeoneofthehigherapplicationratesinthegardengreeningtreespecies．Byplantingalargenumberofurbangreenspacesofthecityparks，squaresandstreets．Inrecentyears，somecitiesintheNorthChinaregionginkgosummeryellow

3、leavesphenomenon，whichhasbecomethebiggestobstaclerestrictingtheapplicationofginkgobiloba，alsoseriouslyaffectedthelandscapeeffectsofGinkgobiloba．Inordertofindthekeyoftheginkgobilobayellowleaves，andgardenplantsinthefutureconservationandmanagementworktoprovidescientificandtheore

4、ticalbasis，toavoidblindafterginkgobilobaconservationmanagementtoestablishconservationmeasurestoachieveef五cientandorderlylaborandmanagementtoprovideabasis．Therefore，thesubjectofforginkgosummeryellowleavescorrespondingresearch．Inthisstudy，thefourcitiesofBeijing，Shijiazhuang，Tan

5、gshan，andJinanasanexample．Theeffectsofginkgobilobainvariouscitiesasthemainstreettreesstreets．Byseveralfactorsofginkgobilobaroot，siteenvironment，temperatureandmoistureconservationmeasuresfour—monthcontinuousinsituobservations．Summeduptheinfluencingfactorwithyellowleaf,ginkgobi

6、lobaFindthecauseyellowleavesofginkgobilobaandfindingsfromthekey．Themainfindingsareasfollows：(1)Junemaximumtemperatureisbasicallymaintainedatabove30"C，andlowrelativehumidity，dryweather．Inthisdryandhotenvironment，duetotheenhancedroleofleaftranspiration，leavesandrootsneedalotofw

7、atersupply．However，thiskindofweathernotonlybroughtadryenvironment，butalsoeasytoformadryhotwind，caneasilyleadtosoilmoistureloss．Thesurveyfoundthatmostoftheginkgobilobarootdistributionshallow，evenifrootgrowthisgood，alsonotasufficientwatersupply，poorgrowthofthelackofrootwaterism

8、oreserious．JulytoSeptember，thesoilinthehotandhumidclimateandenvironm