不同水肥條件下春小麥競(jìng)爭(zhēng)能力和產(chǎn)量之間的關(guān)系.pdf

1、蘭州大學(xué)碩士學(xué)位論文不同水肥條件下春小麥競(jìng)爭(zhēng)能力和產(chǎn)量之間的關(guān)系姓名：王春霖申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：生物學(xué)生態(tài)學(xué)指導(dǎo)教師：張榮20090501藺塒蟲(chóng)搴碩I：學(xué)位論文小州水肥條件下備小麥競(jìng)爭(zhēng)能／J和產(chǎn)量之問(wèn)的關(guān)系A(chǔ)BSTRACTImprovingyieldsofperunitareaisthemainobjectiveofcropbreedingBasedontheobjective，breedersusuallyselecttheind

2、ividualswhichhaspropertieslikegreaterbiomass，morebreedinggenerationsandbestindividualperformance，asthegoalofbreedingHowever，cropproductionisapopulationprocessratherthanindividualperformanceThecolonyconsititutedbyindividu

3、alperformingbestindividuallywillperformworsewhengrowtogether，primarilyduetostrongcompetitionandbiologicalstressamongindividualsReflectingontheproblem，Donaldputforward‘ideotype’concept，T№corecontentisthathighyieldingcrops

4、houldbecomposedofgroupsofweakcompetitors，aimingatimprovingcommunalperformanceManyresearchersproposedthatweshouldreducegrowthredundancycausedbyincreasingcropcompetitiveabilityinmodemcropbreedingforthepurposeofimprovingcom

5、munalyieldHowever，whethercurtailingredundantcompetitivecangainhigheryieldIstherelationshipbetweencompetitiveabilityandseedyieldcorrelatednegativelyFurthermore，Thecompetitiveabilityofcropalwayschangingindifferentcircumsta

6、nces，theircompetitiveabilityandcompetitionresultswillbedifferentunderdifferentconditions。Todeterminetherelationshipbetweencompetitiveabilityandgrainyieldsoftwospringwheatcultivarsdingxi24andheshangtouthatunderdifferentwa

7、terfertilitylevels，deWitreplacementseriesexperimentswereconductedin2007and2008，cultivarsweregrowninpairwisemixturesandwerecomparedwithmonocultureTherewasnosignificantrelationshipbetweencompetitiveabilityandproductiveperf

8、ormanceoftwospringwheatcultivarsdingxi一24andheshangtouin2007Theyieldofdingxi一24WaslowerthanassembledtreatmentofheshangtouinthegroupWON0、WoNlandWoN2whengrowninmonoculture，Onthecontrarytheyieldofdingxi一24washigherthanthato

9、fheshangtouinthetreatmentgroupWIN!、W2N0andW2N2Whencomparedthecompetitiveabilitybetweendingxi一24andheshangtouinmixture，therewasnodefiniterelationshipfordifferenttreatmentsin2008，thereWasapositivecorrelationbetweenthecompe