玉米根系生長發(fā)育特性及與地上部關系的研究.pdf

1、內(nèi)蒙古農(nóng)業(yè)大學碩士學位論文玉米根系生長發(fā)育特性及與地上部關系的研究姓名：管建慧申請學位級別：碩士專業(yè)：作物栽培學與耕作學指導教師：劉克禮郭新宇20070501StudyonCharacteristiesofRootsystemgrowthandRelationshipbetweenrootanduplandpartsofMaizeAbstractTheexperimentWaqcardedoutwiththePVCtubeplantan

2、dfieldplantthroughdifferentdensitytreatments，studyonthecharacteristisofdifferentlayerofroot，thespacedistributiondryweightofroot，therelationshipbetweenrootanduplandpartsofmaizeTheresultsaresummarizedasbelow：Long，weight，vo

3、lume，surfaceareaandactiveabsorptionareaofrootinmaize，allofthemperformancedsinglepeakCHIVewhilegrowthperiodnlepeakvalueappeared12thdaysafterSpinningstage，afterthisalongwithgrowingprocessgrowthspeedofthemslowdeclineWhenmat

4、uringstageallindexesstillkeepforumvalueFromsowingtO23days，densityeffectthemminuteness，thereafterwithdensityincreasingallindexesraducingThehigherlayersofrootthegreatertheinfluenceDifferentlayerroothaddifferenttimeofgrowth

5、andfunctionvalueandtimeofp船kexisteddifference，showingwithgrowthanddecline—processThehi曲erLevelsofrootthelaterofoccurrencetimeandthebiggerofvalueofpeakBelowofdifferencedensitytreatments，dryweightofrootinO100cmsoillayerfol

6、lowingsinglepeakCurve，peakvalueOccursinthefilingstageFallingrateofpeakvalueWasthehighestinhighdensityApeakdistributionofrootsysteminmaizealongsoilprofileasfollowing：Inflareopeningstagepeakvalueofdrywcightofrootin020era，d

7、ryweightofrootreducedquicklywiththeincreasingsoillayerthicknessAfterflareopeningstageapeakdistributionofdryweightrootinsoilwasNegativeIndexcuweDifferenceofapeakdistributionofdryweightofrootindifferentdensitytreatmentsThe

8、rootshootratiowasincreasedgraduallyduringmaizegrowthprocessTendencyofrootshootratiowasdisplayedslowfast—slowregularpatternTherootshootratioWaSachievedmaximuminseedlingstage，thespeedofrootshootratiochangeslowlyBetw∞nshoot