the one process ongoing in the 20th century that will …

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1、ZoningOutinGlades“Theoneprocessongoinginthe20thcenturythatwilltakemillionsofyearstocorrectisthelossofgeneticandspeciesdiversitybythedestructionofnaturalhabitats.Thisisthefollyourdescendantsareleastlikelytoforgiveus.”--E.O.WilsonOVERVIEW:Cedargladesareuniqueecologicalcommunities

2、.Usethisactivitytoexamineplantadaptationsandtheimpactofdevelopmentinthisunusualecosystem.GRADELEVEL:3–12(canbeadaptedtoanygradelevel)TIME:two50-minuteclassperiodsSETTING:Classroom_____________________________________________________OBJECTIVES:Studentswill(1)describethegeologyan

3、dappearanceofacedarglade;(2)identifythesixplantzones,asdefinedbysoildepth,light,andwater;(3)identifyrepresentativegladeplantsandseveralcharacteristicsbasedonzone;and(4)simulatedevelopmentinalimestoneglade.MATERIALS:1classsetofCedarGladePlantPhotographCardsandPlantDescriptionCar

4、ds(seeappendixfor28flowers);teacherneedstomountcardsandlaminatefordurability1CedarGladeZoneworksheetperpersonorpartnership1indexcardandpencilperpersonorpartnership1cedarglademapperteamEachteamneeds100tokens(bottlecaps,buttons,unifixcubes),10markedtorepresentendemicplantsBACKGRO

5、UND:IntheCentralBasinofMiddleTennesseearefoundoutcroppingsofexposedlimestoneformedsomefivehundredmillionyearsagoduringtheOrdoviciangeologicalperiod.Cedargladesareopenrocky,gravelly,orgrassyareascomposedofthislimestonerock.Thename“cedar”comesfromtheEasternredcedartreesinthewoods

6、thatsurroundandseparatetherockyclearingsknownasglades.Sincetherockyareasaretrulytheglades,amoreappropriatenameforthisuniqueecologicalareaislimestoneglade.Opencedargladesincludeextremeclimaticconditions.Wintertemperaturesinopengladesaresimilartothoseofadjacentforest;however,summ

7、ertemperaturesareoften10to30degreeshigher.Thingladesoilsgenerallyremainwaterloggedduringmuchofthewetwinterandearlyspring,butrapiddryingoccursduringthesummerandthegladebecomesavirtualdesert.Itisnotsurprisingthatgladeplants,likemanydesertplants,havespecialmeansofcopingwithhot,dry

8、summers.Plantsgrowinginthethinnestsoilshaveveryshallow