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LessonPlanforSantaRitaExperimentalRangeVegetationMonitoringMarthaGebhardt,OutreachCoordinator
Objectives:Part1:StudentswilllearnaboutcommonplantspeciesonSRERthroughvegetationmonitoringtechniquesusingthebelttransectmethod.StudentswillanalyzeandpresentdatacollectedinPart1byclassifyingplantspeciesbasedongrowthhabits(grasses,forbs,shrubs)Part2:UsetheScientificMethodto:
MakepredictionsaboutplantspeciesatdifferentlocationsontherangeAnalyzeplantspeciesovertimeusingpastdatarecordsandphotographsofthetransectsComparevegetationtrendstoprecipitationandgrazinghistoryCompare/Contrastresultstootherlocationsontherange
Part1:MaterialsClipboard,penorpencil,andpaperforrecordingdataMeasuringtapethatisatleast100ftlong1ftrulerSurveyflags(apx.10)SRERplantguideAdditionalplantguide(s)[optional]BackgroundTherewillbealocationpredesignatedonSRERwherestudentscangotakevegetationmeasurementswithoutdisturbingotherscienceexperimentsthatareongoing.Explainthatsince1972,everythreeyearsplantdensitymeasurementshavebeenrecordedonSRER.Today,wewillrecordthisdatausingthesameproceduresscientistsuse.Wewillbeusingabelttransectmethod.Wewillmeasureout100ft.withmeasuringtape.Plantdensitythatiswithin1ftofthemeasuringtapewillberecorded.Counteachplantspeciesonlyonce.BeltTransectImage:
Procedure1.Separateclassinto3-4groupsdependingonsizeofclass.Usuallyabout4-5students/groupensureseveryonewillhavetasksthroughoutthelesson.2.Markastartinglocationforeachgroup.Makesuregroupsdon’tendupoverlappingeachotherwhentheymeasureouttheirtransects.Trytouseavarietyoflocations---havegroupsgooffindifferentdirections,ifthere’sanelevationchangehavesomegroupssurveyalongitandothersnot,aimforavarietyofvegetation,ifpossible.
3.Haveeachgroupmeasureout100ft.andmarktheendinglocationwithasurveyflag.4.Havestudentsrecordimportantinformationabouttheirtransect.Someusefulinformationthatmightaffectvegetationincludes:pastweather(ifknown),locationoftransect,orevidenceofpredators(scat,fur,etc.)5.Countallplantspecieswithinthetransectusingtheplantspeciesguide.Don’tworrytoomuchaboutmakingsureyouhavetherightspeciesifit’shardtotell.Differentgrassspeciescanbedifficulttodistinguish.Itismoreimportanttocounttheindividualthanitistoaccuratelyidentifyit.ExampleDatasheet:
note—thisisahypotheticaldatasheetforpurposesofprovidinganexample6.Sumandcategorizetheplantsineachtransectaseither:grasses,forbs,orshrubsDefinitionsofGrasses,Forbs,andShrubs:Grasses-vegetationconsistingoftypicallyshortplantswithlongnarrowleaves,growingwildorcultivatedonlawnsandpastureForbs-vascular(havingtissuethatconductwater,sap,andnutrients)plantswithoutsignificantwoodytissueabovetheground.
Shrubs-perennial(plantthatlivesmorethan2years),multi-stemmedwoodyplantthatisusuallylessthan4-5metersinheight.Shrubstypicallyhaveseveralstemsarisingfromorneartheground.(cactusandchollaareshrubs)ExampleDatasheet:
note—thisisahypotheticaldatasheetforpurposesofprovidinganexample7.Presentandcomparegroupresults.Questionstoconsider:-Whydoyouthinkyourgroupgothigh/lownumbersofgrasses,forbs,orshrubs?-Whydidothergroupsgethigher/lowernumbersofgrasses,forbs,orshrubs?-Whichgrouphadthegreatestoveralldiversityofplantspecies?-Whichgrouphadtheleastoveralldiversityofplantspecies?-Whichgrouphadthehighestdensityordiversityofgrass,forb,and/orshrubspecies?Why?-Whichgrouphadthelowestdensityordiversityofgrass,forb,and/orshrubspecies?Why?
Part2:Materials
PenorpencilpaperSRERplantguideAdditionalplantguide(s)[optional]Datasets—4totalGraphingpaperorcomputerwithexcelCalculatorBackgroundVegetationtransectshavebeenongoingat132sitesonSRERsince1972(greenpointsonmap).Densitywasmeasuredevery3yearsbetween1972-1984and1991-2015.Today,wewillanalyzethedatacollectedat4ofthesesites(yellowstarsonmap).Oneofthesesiteshadafirein1994(siteontheeast).Wewillanalyzethenumberofgrasses,forbs,andshrubsateachofthesites.Wewillanalyzetrendsinvegetationandmakeinferencesaboutwhetherornotthesetrendscanbeexplainedbypastprecipitationorcattlegrazingrecords.Wewillcomparevegetationacrossthesitesandseetheeffectsfirehadonvegetation.MapofvegetationtransectsatSRER:
Site Location Elevation(m)
Site1
Site2
Site3
Site4
Procedure1.Separateclassinto4groupsandgiveeachgroupadataset.
Notesondatasets:Eachdatasetcontains:plantdensitydata,planttransectphotos,precipitationdata,andcattlegrazingdata
PlantDensityData-Thisisthetotalnumberofeachplantspeciesoccurringinthebelttransectperformedateachsite.-“xxx”valuesmeannodataisavailablebecauseareadingwasnotmade.Assumeallofthesevaluesequal0whenanalyzingdata.
PlantTransectPhotos-Theseareallavailablephotosoftheplanttransects.Someofthephotodatesmightnotalignwithsampledates,butyoushouldstillbeabletovisualizedifferencesinvegetationovertime.
PrecipitationData-Thesereadingaretakenfromtheraingaugelocatednearesttoyoursite(seeimagebelow)
CattleGrazingData-Asweknow,manyresearchersatSRERarestudyingcattlegrazing.Thisdataisthetotalnumberofcowspresentinthesiteforeachyear.MapofraingaugesatSRER:
1 Pasture8Transect14 12692 Pasture12BTransect7W 9813 Pasture5NTransect11W 8834 Pasture6ATransect1 1284
SWraingauge
NWraingauge
RUELAraingauge
FORESraingauge
2.Formahypothesesabouttheplantdensitydatausingif,then,becausestatements.Forexample,ifthereismorecowsinthesiteforacertainyear,thentherewillbelessgrassdensity,becausecowseatgrass.Asagroupdevelop2hypotheses:1foryoursiteand1acrosssitesThingstoconsider:findingsfromPart1,elevationateachsite,Whateffectdoyouthinkcattlegrazingorprecipitationwillhaveonvegetation?WhatdoyouknowaboutthevegetationhistoryofSRER?Howwillfireaffectvegetation?3.Analyzethedataforyoursite-Classifyeachplantspeciesasgrass,forb,orshrubusingthedefinitionsprovidedinPart1andtheSRERplantspeciesguide.-Sumthetotalnumberofgrasses,forbs,andshrubsforeachyear.-Ifpossible,graphthesevaluesovertime-Lookatdiversity:Bothwithineachoftheseclassificationsandtheoverallplantdiversityatthesite-Arethereanysurprises?-Howdidthevegetationchangeovertime?-Compareresultstotheplanttransectphotos.Canyouseehowtheresultscomparetoactualphotographs?-Compareresultstothecattlegrazingandprecipitationdata.Aretheresimilaritiesordifferences?Forexample,dohigherlevelsofcowsaffectvegetation?Doesmoreorlessrainforaspecifictimehaveaneffectonvegetationtrends?4.Re-visitthehypothesisforyoursite-Doyourresultssupportorrejectyourinitialhypothesis?-Haveyoulearnedmoreinformationthatmighthelpexplainwhytheresultssupport(orreject)yourhypothesis.Forexample,didtheprecipitationandcattlegrazingdatahelpyouexplainthevegetationdensitydata?-Areyouconvincedbytheresults?Doyouneedmoreinformationtosaywhetherornotyourhypothesiswassupportedorrejected?(ThinkaboutPart1:Howsimilarordifferentwaseachgroup’sresults?)-Whataresomeadditionalquestionsthathavearisenthroughthisanalysis?-Doyouhaveideasforfuturequestionsorresearch?4.Shareresults.Haveeachgrouppresenttheirinitialhypothesis,vegetationdensitydataovertime,andtheirconclusions(#4).Remindstudentstoconsidertheir“acrosssites”hypotheses.Aseachgrouppresents,encouragestudentstoaskquestionsthatwillhelpthemdecideiftheir“acrosssites”hypothesisissupportedorrejected.Forexample,ifGroupAdevelopedan“acrosssites”hypothesisthatinvolvedcattlegrazingandthegrouppresenting(GroupB)didnotincludethisdata,GroupAshouldaskGroupBwhattheircattlegrazingdatawasandhowitcomparedtotheirvegetationdensitydata.5.Getbackintogroupsandgivestudents5minutestodecideiftheir“acrosssites”hypothesiswassupportedorrejectsbytheinformationtheyheard.Re-visitthepointsin#4.6.Haveeachgroupsharetheirfinalconclusions.Wastheir“acrosssites”hypothesissupportedornotandwhy?