榆林風沙區(qū)樟子松枯死的原因及防治研究.pdf

1、(⑧西弛衣椽針捉大學2006屆在職攻讀碩士學位研究生學位論文榆林風沙區(qū)樟子松枯死的原因及防治研究類型————盎些撞亡—一領域、專業(yè)、方向————型盔L——一研究生————疆也掛—一指導教師———籃蠱—藍援一完成時問————麴盟J上—一中啊睫自枷墟ASTUDYONTHECONTROLANDCAUSEOFTHEWITHERINGOFPINUSSYLVERSTRISVARMONGOLICAINYULINSANDYAREAABSTRACTThe

2、rateofinfectedPinessylvestrisVatmonglicaachieved107％therateofdeathwas66％(14—222％)throughcomprehensiveinvestigatingthedistributionregionofPsylvestrisVatmonglieainYulinsandyareathewiltmainlytookplaceintheyoungerforest、vim1

3、0to15yearsold，thedeathmainlywereapexandshoots，buttheplantsweregreenwitheredalSOTIlispaperinvestigatedandanalysisedthesiteconditionsplantcoverratethicknessofsoilcrustandmoisturefactorofdeadPsylvestrisVarmonglicaforestland

4、Theauthorspreliminaryconsideredthattheadverseecologicalfactorscausedphysiologicalweacknessofthetrees，harmofligonychusununguisJacohihadincreasedspeedofdeathThispaperconsideredthatChaetomiumglobosumKunzeishadcausedPsylvest

5、risVarmonglicadeath，throughinvestigatingtheharmeddegrees，deadcharacteristicsandsymptomofinfectedplantsofPsylvestrisVatmonglica，separatingandculturingfungusfromfreshinfectedplants，inoculationandsecondseparatingandculturin

6、gtestChaetomiumglobosumKunzefallundertheclassofChaetomium，Chaetomiaceae，SphaerialesItcouldgrowwellat180to280，andoptimumtemperatureWag25℃；theoptimumPHwas68thesporulecouldbudwellat15“0to280，andoptimumtemperaturewas25℃Thepe

7、aI【periodofinfectionWasfromtheearlierofJulytothelaterofAugusteachyearThepcakperiodofdeathoftreeWaSmiddleofApriltomiddleofMayinthenextyearItwerepossibletobereleasedandtransferedforsperuleofthediseaseduringthewholegrowingp

8、eriodThefrequencyandquantityofrainfalldirectlyinfluencedthetransferandamountofthesporuleArtificialinoculationshowedthatthetimeofinfectionfordiseaseWasmainlyfrommiddleofJunetomiddleofAugust，theperiodofthelatencyfordisease

9、ishalfmonth，thewaytoinvadeforthediseasewasthroughtheinjuredpartoftree，theinfectedpartofatreeanddeadtwigweretheplaces，wherethepathogenicfunguslivedinwinterThecontrolmeasuresofPinnssylvertrisVatmangolicaofyounggrowthdiseas