寧南旱作農(nóng)業(yè)區(qū)保護性耕作的環(huán)境效應及對產(chǎn)量影響研究.pdf

1、寧夏大學碩士學位論文寧南旱作農(nóng)業(yè)區(qū)保護性耕作的環(huán)境效應及對產(chǎn)量影響研究姓名：徐華軍申請學位級別：碩士專業(yè)：草業(yè)科學指導教師：謝應忠袁漢民20090501寧夏大學碩士學位論文摘要AbstractStudiesthedifferentconservationtillageonmaizeandwinterwheatInthedrylandofPengyangcountryThetestresultsindicatedthat：1Fromthe

2、treatmentofcoveringstubbletocrop，itcanincreasesoi1moisturecontentsBydifferenttreatments，winterwheatsoilmoisturecontentswillincrease4％一50％，maizesoilmoisturecontentswillincrease77％一24％。andwithstubblecoveringmoresoilmoistur

3、econtentswillincreasemore，thisisgoodforfarmlandtokeepsoi1andwater2It’Seffectivetoincreasesoi1watercontentandsoiltemperaturebycoveringmembranefarmingindryandcoldagricultureareaIt’Sgoodforcrops’growingandwinhigheryieldPlan

4、tingmaizebycovermembraneandstubblewi11increase73％一449％soilwatercontentthanconventionalfarming，maizeyieldcanincrease78％87％thanconventionalfarmingSo，insucharea，weneedguaranteeingenou【ghheatletmaizegrowswell，thetechniquesof

5、conservationtillageandcoveringmembraneshouldtocombinewell3Insameecologicalconditions，plantingwinterwheatinasideofmembranebynotillandcoveringmembraneshowsmorebettergrowthsituationthanconventionalfarmingThewinterwheatyield

6、ofmembranesideplantingcanattain3540kg／hm2一Itishigher788％thanconventionalnudityfarming，thenetearningswi11increase788％，showsmorehigherWUE(waterusingefficiency)，especiallyindroughtyears4Onlycoveringstrawandstubblewilldecrea

7、sesollwUE1／2coveringstubbleanda11strawcoveredwillbedecreasetheefficiency3179％、1683％thanconventionalfarmingthereasonsoftheresultare：inonehandcoveringstubblecanincreasesoilwatercontents，butinanotherhand，thesoiltemperaturew