興安胡枝子發(fā)芽及生長研究.pdf

1、東北師范大學(xué)碩士學(xué)位論文興安胡枝子發(fā)芽及生長研究姓名：李莉申請學(xué)位級別：碩士專業(yè)：生態(tài)學(xué)指導(dǎo)教師：周道瑋20050501AbstractTheexperimentwasconductedtostudyongerminationofseedsresponsingtohydrationdehydrationcycles，growthruleandpopulationdensitydependenceofLespedezadmurica，wh

2、ichtheoreticallystudiedtheadaptabilityofseedgerminationinaridenvironmentandthelawofLdavuricapopulationdensitydependence，itrichedthetheoryofplantecologyandalsoprovidedbasicdateandsciencefoundationofapplicationofLdavuricaT

3、heresultsshowed：1Undergoingthehydrationdehydrationcycles；thewaterabsorbingrateofseedisquickerthanuntreatedseeds，whichimprovedefficiencyofwaterutilizedThegerminationrateandtheindexesofgerminationoffourtreatedseedsofhydrat

4、iondehydrationcyclesweresimilartotheotherfourtreatedseedsdelayedwith120daysItrelatesthatseedCanretain‘‘memory’thathadaccumulatedduringhydrationandhydrationdehydrationcycleswhichCanimprovethegerminationrateofseedThegermin

5、ationindexesofseedsonHD1andHD一2werehigherthantheuntreatedseeds，whichsuggestedthatseedsreducethetimelagbetweenthebeginningofseedwaterabsorbingandgermination；itwasecologicaladaptabilit／ofLdavuricainaridenvironment2Thegrowt

6、hruleofLdavuricawereinvestigatedTheresultsshowedthattheseedlingstageWaslonginSOWyearLdavuricaturnedgreeninthemiddleofMaythesecondyear；Ithadtwoorthreebranchesinfirstyearandfiveorsixbranchesthesecondyear；InthemiddleofJulyi

7、tbegantoflowerflowerseasonwasshort，andalsoblossomwasconcentrated；Therootwasabundant，itgrowedfastinsidedirectionandlongitudinaldirection，whichfinelyutilizedthewaterofsoilindifferentlayersandadaptedtoaridenvironmentTheresu

8、ltsalsoshowedthat，theseedWaSsmallandinsidecalyx，theweightofthousandseedsWas27269and23859withoutcalyX，andmostoftheseedwerehardseeds；Theabovegmundbiomassofaplantis1579，theratioofstem／leafwas11：l，thereproductiveorganyieldWa

9、S819inripeseason；InthesecondyearTheabovegroundbiomassofoneplantis35，79，theratioofstem／leafwas19：1，thereproductiveorganyieldWas1309，filewatercontentofplantwaslow；TheproteincontentofleafandreproductiveorganwashighConsideri

10、ngplantregenerationandbiomass，wecanuseflowerasforage，alsoCanharvestseedforusing3Theplantshavehigherheight，highergrowrateandlongershootlengthinlowdensitywhiletheplantsinhighdensityhaveshorterplant，smallergrowrateandsmalle