稻田雜草群落演替及其防治技術(shù)研究.pdf

1、浙江大學碩士學位論文稻田雜草群落演替及其防治技術(shù)研究姓名：何翠娟申請學位級別：碩士專業(yè)：農(nóng)業(yè)推廣指導教師：周偉軍沈國輝20040501AbstractAfieldsurveyofweedspecies，communitystructureanddamagelevelwascarriedoutinpaddyricefieldatriceheadingstageduring19981999Theparameterssuchasrelativ

2、edensityrelativeuniformityrelativefrequencyrelativeabundanceanddamageindexwereusedtoanalyzethesurveydataComparedtothedatasurveyedin1980s(80weedspeciesbelongingto27families)，thenumberofweedspeciesdecreasedto28speciesbelon

3、gingto13familiesAmongthem，there“&ere5speciesinGramineae(1786％)and8speciesinCyperaceae(2857％)Therewere15speciesofbroadleavedweed(5357％)TweheweedspecieshadrelativelylargeeffectonthericeyieldDominantspecieschangedalongwitht

4、hefrequentuseofratherlimitedherbicides，intheorderofSagittariapygmaeaMig，Monochoriavaginalis(Burrof)PreslexKunth，Linderniaprocumbens(Krock)Philcox，Echinochloacrusgalli(L)Beauv，EcliptaprostrataL，Ammanniabacclye陽L，Rotalaind

5、ica(willd)Koehne，CyperusdifformisL，Alternantheraphiloxeroides(Man)Griseb，Leptochloachinensis(L)NeesThestmctureofweedcommunitieschangedfrom“Gramineaeweeds，Cyperaceaeweedsandbroadleavedweeds’’to“broad—leavedweedsCyperaceae

6、weedsandGranaineaeweeds”Thecommunityofannualless—damageweedswasgraduallysucceededtothatofperennialvirulentweedsThroughtheapplicationofchemicaltreatments，theweeddamagedegreecouldbereducedto】essthanleve】oneThepresentpaperd

7、iscussedthefactorscausingthesuccessionofweedcommunitiessuchasvirulentweeds，includingnon—rationaluseofherbicides，changeoffarmingsystemandcroppingsystemThecombinationofagriculturalandmechanicalcontrolpracticesandchemicalme

8、rbicide)treatmentwasattemptedinthisstudyBasedontheresultsoflaboratoryandfieldexperiments，thesuitableconcentration，applicationtimeandnumberandtheircombinationofherbicideswereproposedTheintegratedcontrolsystemcombiningagri

9、cultural，mechanicalandchemicalapproachescouldalleviatethesuccessionofweedcommunitiesandreducethedeteriorationofecologicalenvironmentKeywords：Paddyfield；Weedsurvey；Dominantspecies；Community；Succession；Optimizingsystem；Con