健康树木的可持续发展性

HealthyTrees-SustainableLandscapeASLANationalConference2008ChrisA.CowlesSeniorUrbanForesterISACertifiedArborist®,MDLPForester,MDLicensedTreeExpertIntroduction•AboutTCOT•Aboutme•AboutHealthyTrees•AboutyouInfrastructureRenovationsfor23rdStreetMedianCrystalCity,VA://•WheredoHealthTreesbegin?GettingtotheRootoftheProblem•DesignforSustainability•NewTechniquesforSuccessinHealthyTrees•Q&A“Ifsomedaywearetoknoweverythingthereistoknowabouttheabovegroundportionofthetree,wewillstillonlyknow…”Dr.AlexShigoUSForestService“…halfthestory!”HealthyTreesstartwithHealthyRoots-“MythBusters”•Dotreerootsreallyextendonlytothedrip-lines?•Whatabouttaproots,mirrorimages,&formulas…?“FirstAnnualNationalCapitolRootAppreciationDay”RockSpringPark,Bethesda,MD-November1992•15”HoneyLocust:•rootradius=34feet•AnotherrootmythdebunkedMythBusters4thAnnualNationalCapitolRootAppreciationDayManassasParkHighSchoolManassas,VAWhydidweneednewmethods?Howdowefindthem?AndwhatdidtheCEOnotaskfor…?BaltimoreLifeHomeOffice,OwingsMills,MD1992and2008HealthyTreesinconstructioncomefromteamworkandbeginattheDesignTableWhodoyouinvitetoyourTable?SustainableDesignvsDesignAfterthoughtsSupersonicAir-ToolsGeo-compositesforHealthyRootHealthySoilBiologyUSSenateParkPerimeterSecurityConceptualDesign/BuildTeamHowdoweusetreesasDesignElements?Oraretheymere“Afterthoughts”?Ifthetreesareadesignelement,notanafter-thought,thenyouhaveSustainableinyourDesign.5yearslater…“AreweSustainableyet?”“Wherearetheroots?”•Mach2SupersonicAir-tool(SSAT)forRootInvestigation•Questionfortheprofessors:“HowfastisMACH2?”RootInvestigationforSenateParkPerimeterSecurityDesignDocumentfindingsandpreparerecommendationsfordesignmodification.NorthernRedOak“Kwanza”FloweringCherryProposedUSCapitolSecurityBollardsAssessimpactanddeterminealternatedesign&constructionproceduresRootInvestigativeStudyReportObjectives:DeterminegrowthcharacteristicsofrepresentativetreespeciesinLoudounCounty,VAbymeansofinvestigativedigginginrepresentativespecies,soilsandhydrologicalregime.TheresultsofthisStudyareusedtodeterminestrategiesindesignandconstructionaswellasprescribeappropriateprotectionmeasures&stressreductiontherapies.BeginningSupersonicAirtool(SSAT)Investigationwithinproposedroadwayselectingrepresentativetreespecies:WhiteOak,RedOak,Hickory,Ash.Noterootsareverynearsurface.ThisisnotcharacteristicofwhiteoaksinMontgomeryCountyMDPiedmontinloamyclaymicarichsoils.Deeperrestrictivelayersareassumedtobethereason.Refertosoilsboringreportsforverification.TechnicalFindings23”WHITEOAK(whitepaintforphoto)•TOTALROOTLENGTH(est.)=50’•DIAM.ATDIST.FROMTRUNK•3”@10’•1”@20’•.5-.75”@30’•.25-.5”@40’•ENDATEST50’ConceptDesignforProposedCorporateFinancialCenterNationalRuralUtilities,DullesTownCenter,VASeverallocationsatthePennsylvaniaStateCapitolSouthParkwereidentifiedwithtreeswhicharehavingpotentialdesignelementsinstalledorrenovatedwithintheirCriticalRootZones(CRZs)withpotentialformajorimpacts.Thesedesignelementsarestormdrainpipeandinfiltrationbeds,concretesteps,electricsitelightconduits,retainingwalls,waterlines,andwalkdemolitionandreconstruction.RenovationstoPennsylvaniaStateCapitolSouthParkLandscapeConstructionSuperintendentdocumentingsignificantrootdepthandlocationfordesignofgradebeam.RenovationsofprivateresidenceinPhiladelphia,PAUtilizeSSATforloweringgradewithinCRZsfornewsidewalkRootInvestigationduringdemolitiontodetermineneedforspecialdesignmodificationsforretaining38”Quercusphellos.IndependenceAvenueStreetscapeRenovationattheUSCapitolHouseOfficeBuildingaka“LongworthOak”5yearslater….•WorkinginsidethecriticalrootzonewithSSAT•Inserting$3,000lightpolebasebetween2matureQuercusphellosatthehistoricHomewoodHouseJohnsHopkinsUniversityHomewoodCampusBaltimore,MDLandscapeRenovationsDesign/Build•Sprinklerandlowvoltageelectricalcableinstallation–“Butweareonlydigginglessthanafootdeep!”•Architects:Crossout“Shallbehandexcavated”inyourMasterSpec!RootPruningwithSSAT/HandToolsforroots1.5”diameterorwithininner½ofCRZradius.MethodofRootPruningtobedetermined….PerimeterSecurityforLafayettePark,PennsylvaniaAve&15thStreet,Wash.DC“SmithsonianLevel”RootPruningattheHauptGarden,WashingtonDCUtilizingtheSuperSonicShopVac(SSSV)Problem:SustainingHealthyTreesonaCampusorCommercialSitewithpoorsoilsorpedestriancompactionovertime.•Nativehealthytopsoils=80%compaction;•Urbansiteseasily90%-98%.•Howcanyou“decompact”soilswithoutrootdamage?•SSATtotherescue!RadialMulchingwithSSATto“De-compact”Soils•Backfillwith50%OrganicCompost•ExcellenttimeforCompostTeas/Humates•StandBack!ShadyGroveAdventistHospitalRenovations,Gaithersburg,MD•Subsurfacebasaldecaycanbeverifiedaswellas“Girdlingroot”investigationcanbedoneatsametimeSustainingtreesingradefillsinsitedesign•48”DBHHickoryWheretoputPhaseItoPhaseIIconnectingdrive?T.RowePriceFinancialCenterOwingsMills,MD1995•GradefillsproposedwithintheCRZrequirespecialdesignmodificationandspecialconstructionprocedures•“Rootfriendly”pavementsectionemployingthelatestingroundengagingtechnologiesSustainingTreesingradefill