無芒隱子草種子產(chǎn)量與植株密度的關(guān)系及坪用特性的研究.pdf_第1頁
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1、蘭州大學(xué)碩士學(xué)位論文無芒隱子草種子產(chǎn)量與植株密度的關(guān)系及坪用特性的研究姓名:魏學(xué)申請學(xué)位級別:碩士專業(yè):生物學(xué)草坪生物學(xué)指導(dǎo)教師:王彥榮20100501蘭州大學(xué)碩士學(xué)位論文無芒隱子草種子產(chǎn)量與植株密度的關(guān)系及坪用特性的研究ABSTRACTThenativegrassesplayallimportantroleindevelopmentofgrasslandanimalhusbandryecologicalprotectionandlaw

2、nindustryPresentstudywereconductedwithCleistogenessongoricainthethirdyearandthefourthyearaftersowedtOexploretherelationshipbetweenplantingdensityandseedyield,andinthefirstyearandtheseconedyeartostudyturfusedpropertiesofC

3、songoricainthenorthwestofChina(Gansuprovince)duringtwocontinualgrowingseasonsfrom2008to2009Theresultsshowedthat:1Plantingdensitysignificantlyaffectedtheseedyield,harvestindexandabovegroundbiomassofCsongorica(P005),andasp

4、lantdensityincreasedfrom5plants/mzto50plants/m2,theyareincreasedfirstandthendeclinedduringtwocontinualgrowingseasonsIn2008and2009,thehighestseedyield(6362kg/hmzand3876kg/hmzrespectively)andharvestindex(213%and159%,respec

5、tively)wereobtainedintwogrowingseasonsunder30plants/mztreatmentAbovegroundbiomass(3127kg/耐and2860kg/hmz,respectively)under50plants/m2treatmentperformedgreatsignificantlythantheothertreatments,exceptfor30plants/mz2Seedyie

6、ldin2008wassignificantlyhigherthanin2009underalltreatmentsRatioofactualseedyieldandpotentialseedyieldunder5plants/mz(525%,473%)and10plants/mz(428%,353%)weresignificantlygreaterthanothertreatmentsintwoyears3Intwoyears,pla

7、ntheightincreasedwhentheplantdensityincreasedfrom5plants/mzto50plants/mzbutthecanopywidthdeclined11hehighestplantheightwere701cmand716cmunder50plants/mztreatment,andthecanopywidth(893cmand897cm,respectively)reachedthemax

8、imumvaluewhentheplantdensityat5plants/mz4Plantdensitysignificantlyaffectedtheseedyieldcomponents,suchasfertileshootsnumber/mz,spicas/shoot,seeds/spicaand1000一seedweightTheseedyieldmostcloselycorrelatedwithfertileshootsnu

9、mber/m2,theformerweresignificantlypositivecorrelatedwiththelatterforeachtreatmentintwogrowingseasons,thesimplecorrelationcoefficientswere0741in2008and0780in2009,andthedirectpathcoefficientswere0362in2008and0788in2009,res

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