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1、AstudyontherootcompetitivepatternofannualpastureinmixedgrasslandinalpineregionZHAOChengzhang*ThisworkwasfinanciallysupportedbytheNationalNatureScienceFoundationofChina(No.40971039)andNational11thFive-yearTechnologySupportProjects(2007BAD46B07).Tel：1391938861
2、5；Email:zhaocz@nwnu.edu.cn，SHENGYaping，RENHeng，GAOFuyuan，ZHANGJingCollegeofGeographyandEnvironmentalScience,NorthwestNormalUniversity,Lanzhou,730070,ChinaAbstract:Competitionisacommonphenomenonamongplantcommunities,especiallyamongnaturalcommunities.Itisanimp
3、ortantfactorinbiologyandplant-plantinteractionshasinspiredanincreasingconcerninrecentyears.Theinvestigationofinter-specificcompetitionisusefultorevealthemechanisminplantgrowthandreproductionoforganisms.Plantrootsystemsplayanimportantroleinuptakeofwaterandnut
4、rientsfromsoilforplantgrowth.However,itisstilladivergenttopicabouttheregulatingmechanismbetweenrootmorphologicalvariationsandcompetition.Thespatialdistribution,morphologyofplantrootsandabove-groundgrowthcanbeinfluencedbyinter-specificinteractions.Theirmorpho
5、logycharacteristicsandstructuredistributionwerestudiedtorevealtheadaptivemechanismofrootssysteminthesoilenvironment.ThedeWitseriesexperimentswereconductedtostudytherelationshipbetweenrelativecompetitiveabilityimmixtureandmonoculturealongsevenlevelsofdensitya
6、ttheexperimentstationofShiyangriverinSunancountryofGansuprovincein2010(latitude37°58′26〞N，longitude101°47′34〞E).Itwascarriedouttoanalyzeinter-specificinteractionbetweenAvenasativaL.andViciavillosaRoth.TakingtherootsbothAvenasativaL.andViciavillosaRothasthere
7、searchobject,theWinRHZOwasusedtomeasurethechangesofrootlength,diameter,andsurfaceareaandsoon.Toevaluatethecompetitiveresponsesandthecompetitiveeffectsoftargetplants,theplantcombinationswithAvenasativaL.andViciavillosaRothwereestablishedinplotsinsevenreplacem
8、entgrass-legumecombinations(monocultureofAvenasativaL.andViciavillosaRoth,andmixedcultureofAvenasativaL.andViciavillosaRothwiththeratios:8:2,6:4,5:5,4:6,2:8).FourindexesofRelativeyield(RY),relat
