七種風(fēng)毛菊幞植物在青藏高原東緣高寒草甸的適應(yīng)對(duì)策.pdf

1、西北師范大學(xué)碩士學(xué)位論文七種風(fēng)毛菊幞植物在青藏高原東緣高寒草甸的適應(yīng)對(duì)策姓名：高宏庩申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：植物學(xué)指導(dǎo)教師：王一廰200805AbstractTherearealotofuniqueplantsinAlpineMeadowofEasternQinghaiTibetanPlateauofChina.HowtoadapttothestressfulenvironmentofAlpinewhatreproductivestra

2、tegiessuitthesespeciesWhichprovidesaspecialchancefecologistsevolutionistsReproductivesuccessistheimptantpartofplantsadaptingtothenaturalconditions.Underspecificconditionsplantsfmtheoptimalreproductivestrategythroughtheop

3、timallifehistyacteristics.Therefeweed112populationsofsevenspeciesofSaussureaDC.inAlpineMeadowofEasternQinghaiTibetanPlateaustudiedtheadaptivestrategiesespeciallythecrelationbetweenthealtitudereproductiveallocationsexallo

4、cationsexgantoexplainhowtheyadapttothestressfulenvironmentfinallybecomedominantspecies.Theresultsareasfollow:1.ThereproductiveinvestmentinthefloweringphaseofAnnualbiennialSaussureastellaishigherthanitsnutrientinvestmentw

5、hilesixotherperennialplants’nutrientinvestmentishigherthantheirreproductiveinvestmentregardlessoftheirfloweringphasefruitingperiod.2.Thereistradeoffbetweenmalefemalefunction.S.nigrescensisinclinedtoinvestmentinmalefuncti

6、ongetmalefitnessthroughpollenpathway.Othersixspeciesinvestmeinfemalefunctiongetfemalefitnessthroughseedreproduction.3.WiththechangesofaltitudinalgradientthesevenspeciesofSaussureareachsuccessfulmatingimprovesuccessrateof

7、reproductionthroughthevariationofsexualgans.4.WiththeincreasingofaltitudethenumberweightofS.parviflaS.epilobioidesS.subulisquamaS.iodostegiaS.nigrescensdecreasesbuttheyensuresuccessfulreproductionbyimprovingmaturationrat

8、eofseedslengtheningpappus.5.QinghaiTibetanPlateauhashigheraltitudeairtransparencestrongsunshineultravioletrayvividpurpleflowerletcanreflectdifferentlightwaveavoidingtheamassmentoftoomuchheatinjuryfromstronglight.6.Flouri

9、shinggettingenoughsunshinecanraisetheinnertemperatureofinflescencesimprovetheirgrowthontheotherhbractswrapinflescencestopreventthemalefemalegametocytefromultravioletray.Thusflowers’malefemalefitnessplants’adaptiveability

10、isimproved.7.Approachherkogamyisgoodfplants’femalefunctioncandecreasethedisturbancebetweenfemalemalefunction.Keywds:QinghaiTibetanplateaualpinemeadowSaussureaDC.altitudereproductiveallocationsexallocationadaptivestrategi