29683.塔里木河下游三種鹽生植物的種子萌發(fā)行為研究

1、新疆農(nóng)業(yè)大學(xué)碩士學(xué)位論文塔里木河下游三種鹽生植物的種子萌發(fā)行為研究姓名：朱小虎申請學(xué)位級別：碩士專業(yè)：園林植物與觀賞園藝指導(dǎo)教師：魏巖200910IIStudyonSeedGerminationBehaviofThreeSalinityPlantsinLowerReachesofTarimRiverAbstractSomeexperimentalstudyfTamarixhohenackeriPoacynumhendersoniiabo

2、utinfluenceofgerminationbystagetimedifferentthermoperioddifferentconcentrationofNaClThegerminationpercentagegerminationrecoverypercentageaboutPopuluseuphraticawereexaminedtodeterminetheeffectofsaltstressstagetimeongermin

3、ationatroomtemperatureThemainresultswereasfollowed：.TheTamarixhohenackeriseed’sfallshtof1mm.Ithadshtlongevityabout240d，ahighgerminationspeedThePoacynumhendersoniiseed’sfallshtof3.28mm0.83mmIthadshtlongevityabout210d，ahig

4、hgerminationspeedSeedsgerminationthermoperiodsofTamarixhohenackeriwerewide，itsoptimalthermoperiodswere515℃，525℃，15252535℃℃，alltheseedgerminationpercentsweremethan85%inthefourthermoperiodThegerminationrateofPoacynumhender

5、soniiwasnotdifferent(F=1.6720，P=0.2492)TheoptimalthermoperiodfgerminationofPoacynumhendersoniiseedswas1525℃，butthegermination.speedofTamarixhohenackeriPoacynumhendersoniiwerebeenconfinedunder515℃Thegerminationpercentageo

6、fTamarixhohenackeriseedswereabove88%，theconcentrationofNaClsolutionfrom0.05to0.4mo1LThegerminationpercentageofTamarixhohenackeriseedsfelldownfastbecausegerminationwasaffectedbytheconcentrationofNaClsolutionafter0.6mo1Lge

7、rminationpercentagefelltozeroat0.8mo1LSeedsthatwereincubatedinNaClsolutionf8drecoveredafterbeingtransferredtodistilledwater.Wefoundthatthelowgerminationpercentagesofafterbeingtransferredtodistilledwateronlyappearedat0.4，

8、0.60.8molL，otherseedshavepermanentlylosttheirgerminationabilitySoTamarixhohenackeriseedhaveabilityofendurancesaltgermination，butlownessabilityofresisttoxicityofsinglesalt.ThelowconcentrationofNaCl(0.05molL)didn’trestrain

9、seedgerminationHowever，thegerminationpercentagedecreasedwiththeconcentrationofNaClincreasedfrom0.6molLWhentheconcentrationexceed0.8molL，theseedcouldnotgerminateSeedsthatwereincubatedinNaClsolutionf8drecoveredafterbeingtr

10、ansferredtodistilledwaterWefoundthatthelowgerminationpercentagesofafterbeingtransferredtodistilledwateronlyappearedat0.4，0.6molL，butinhighsalinity(0.8，1.0molLNaCl)，thepercentageofrecoveryofseedcanachieve64%58%，sothechief

11、effectofsalinityNaClisprimaryosmosistoseedofPoacynumhendersoniiAtroomtemperature，seedviabilitydeclineslowly.Methan90%seedsstillmaintainedhighgerminationpercentageinthefirstfourweeks，mostofseedslostviabilityafter1020weeks

12、ThegerminationpercentagegerminationrecoverypercentagewereexaminedtodeterminetheeffectofsaltstressstagetimeongerminationTheresultsshowedthatconcentrationsbelow0.2molLNaClsolutionhavelittleimpactonthegerminationHowevertheg