保护性耕作对麦田土壤微生物特性与理化性状的影响

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1、山东农业大学硕士学位论文4保护性耕作对小麦产量的影响小麦产量深还高于常无11．O％，耙还高于常无10．9％，差异均达到显著水平，常还高于常无4．30％，差异不显著。免覆低于常无2．45％，差异不显著。深还、耙还产量较高的原因是公顷穗数、穗粒数和千粒重协调的发展，而免覆产量最低的原因是公顷穗数和千粒重都显著低于其他处理。通径分析表明，铵态氮和与产量直接影响最大，其次为全氮，而pH值和微生物量碳与产量之间存在负相关关系，表明过高的pH值不利于养分供应，而微生物在小麦产量中的调节作用。在本试验条件下，综合小麦产量和土壤

2、微生物特性及土壤理化性状，认为深还和耙还处理较优。关键词：保护性耕作；土壤微生物特性；土壤酶活性；土壤理化性状：产量3耕作方式对土壤微生物特性及土壤理化性状的影响EffectsoftillagepatternsOilsoilmicrobialecologyMajor：Cropcultivation蛐dfarmingsystemMasterCandidate'．W舢堰y珊SnlJervisor：LiZe,lg-jia(Prof3AbstractResearchwasdoneinagronomyfieldinShan

3、dongAgriculturalUniversityin2005．2006．田壕effectsonsoilmicrobialprospertiesandsoilphysicalandchemicalchat'acter,5werestudiedoffourconservationtillagepatternsincludingsubsoilingtillagewithstrawreturned【shortedforSS)，halTOWtillagewitlls仃a_wreturned(shortedforI-IS

4、)。rotarytillagewithstrawreturned(shortedformS)．1tlOtillage诵tllSlI'aWcoveredwithstrawcovered(shortedforNS)andconservationtillagewithstrawreturned(shortedforCS)．withconservationtillagewith110strawreturned(shortedforCN)asacontrast．Theaimwastoclarifytherelationsh

5、ipsbetweentillagepatternsandsoilmicrobialcharacters,enzymeactivityandsoilnutrients，andtosupplyacademicbasefortillagepatternswithhighemeieney．17irst,effectsoftillagepatterns011soilmicrobialcharacte馏．CScouldsignificantlyincreasedsoilmicrobialbiomassCatsowingsta

6、ge,over-winterstageandgetting-upstage，andreducedsoilmicrobialbiomassC砒laterstages．whichshowedthatSlI'aWreturningcouldregulatesoilnutrients．ComparedwithCN,minimumti

7、lagewithstrawreturningespeciallyRSandsshadlaigherabilityofregulatingsoilnutrientswhenbalancedso

8、ilmicrobialbiomassCatantlaesisandmaturitystage．Conservati011tillagepatternsespeciallyNSandHShadhigherratioofmicrobialbiomassCandthushadhigh=abilityofresistingdegradation．ButfurtherresearchwasstillneededineffectsoftillagepatternsOIlsoilmicrobialbiomassC．Theres

9、ultsshowedthatconservationtillagehadhighersoilactivemicrobialbiomassthanCS，high=thanCN，$11"awreturningcouldincreasesoilactivemicrobialbiomass．Conservationtillagecouldincreasesollactive4山东