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Lesson Plan for Santa Rita Experimental Range Vegetation Monitoring Martha Gebhardt, Outreach Coordinator Objectives: Part 1: Students will learn about common plant species on SRER through vegetation monitoring techniques using the belt transect method. Students will analyze and present data collected in Part 1 by classifying plant species based on growth habits (grasses, forbs, shrubs) Part 2: Use the Scientific Method to: Make predictions about plant species at different locations on the range Analyze plant species over time using past data records and photographs of the transects Compare vegetation trends to precipitation and grazing history Compare/Contrast results to other locations on the range Part 1: Materials Clipboard, pen or pencil, and paper for recording data Measuring tape that is at least 100ft long 1ft ruler Survey flags (apx. 10) SRER plant guide Additional plant guide(s) [optional] Background There will be a location predesignated on SRER where students can go take vegetation measurements without disturbing other science experiments that are ongoing. Explain that since 1972, every three years plant density measurements have been recorded on SRER. Today, we will record this data using the same procedures scientists use. We will be using a belt transect method. We will measure out 100ft. with measuring tape. Plant density that is within 1ft of the measuring tape will be recorded. Count each plant species only once. Belt Transect Image: Procedure 1. Separate class into 3-4 groups depending on size of class. Usually about 4-5 students/ group ensures everyone will have tasks throughout the lesson. 2. Mark a starting location for each group. Make sure groups don’t end up overlapping eachother when they measure out their transects. Try to use a variety of locations--- have groups go off in different directions, if there’s an elevation change have some groups survey along it and others not, aim for a variety of vegetation, if possible.

Lesson Plan for Santa Rita Experimental Range Vegetation ...rachelgallery.arizona.edu/uploads/5/4/8/8/54887993/precipveg_lesso… · 2. Form a hypotheses about the plant density data

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Page 1: Lesson Plan for Santa Rita Experimental Range Vegetation ...rachelgallery.arizona.edu/uploads/5/4/8/8/54887993/precipveg_lesso… · 2. Form a hypotheses about the plant density data

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.

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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.

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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?

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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

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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

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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?