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1、青海大学硕士学位论文AbstractAbstractAbstract:ThenaturalgrasslanddegradationinQinghai-TibetPlateaunotonlythreatentoseriouslythesustainabledevelopmentoflivestockindustryintheplateau,butalsothreatenChina'secologicalsecurity,selectionofhighnutritionandadaptableforagespe
2、ciesorgermplasmmaterialisthematerialbasisforrecoveringofdegradedgrasslandecosystem.Localplantgermplasmresourcesbecomethefocusofcurrentresearchbecauseofitswideadaptability.Elymus(ElymusL.)plantsareoneoftheadvantagesnativeplantsinQinghai-TibetPlateau,withwid
3、eadaptability,fastgrowth,tolerantofcoldandhumidity,strongtillering,highqualityandhighyield.ButevaluationonitsproductionperformanceinQinghai-TibetPlateauareasisarelativelyrare,lackofsystematicresearch,limitsitswideapplicationsinthedegradedgrasslandecosystem
4、recovering.40germplasmresourcesofElymuscollecttingindifferentpartsoftheQinghai-TibetPlateauisasresearchermaterialstoevaluatingsystematicallyitsgrowthperiod,agronomictraitsandperformanceinthesamehabitatforselectingofgermplasmresourcestoadapttodifferentbreed
5、ingtarget.Theresultsareasfollowing:(1)Thegrowthperiodofthegermplasmhascertainvariety.18germplasmresourcesareearlymaturitywith116-129days,18germplasmresourcesaremiddlematuritywith131-143days.4germplasmresourcesarelate-maturingwith146-157days.(2)Thetotalof19
6、indicatorsofthemaincomponentcanreflectmainagronomictraits,includingleaflength,flagleaflength,numberofgraininsinglesequence,paniclelength,lengthofflagleaftotheearbase,earwidth,flagleafwidth,reproductivebranchlength,secondleafwidthandlengthoflemma,knotlength
7、,averagerootlength,thefirstglumeawnlength,numberofwithoutgraininsingle-sequence,rootdepth,firstglumelength,stemdiameter,numberofrachisandglumewide.(3)TheclusteringanalysisofagronomictraitsbasedonEuclideandistance17wasadoptedfordifferentbreedingtarget.Whent
8、heEuclideandistanceof17,40germplasmmaterialscanbedividedintothreecategories,thefirstcategoriesincludes11materials,themainagronomictraitssuchasearlength,earwidth,spikeletwidthpresentbetterperformance,heightofh
