免耕对水稻根系生长、生理特性与根际微生态的影响

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1、ratiowassignificantlylowerthanthatofconventionaltillagefleeattheearlystage，whiletheroot／shootofno-tillagefleewasequaltoorevenhigherthanthatofconventionaltillagedeeatthelaterstage．Attheelongationstage，theactivitiesofSOD，PODandCATintherootsofno-tillageorno-tillageareaofrootseparationtillagewerelowerth

2、anthatofconventionaltillageorconventionaltillageareaofrootseparationtillage，respectively,whilethecontentofMDAintherootsofno·-tillageorno·-tillageareaofrootseparationtillagewashigherthanthatofconventionaltillageorconventionaltillageareaofrootseparationtillage，respectively．Atthegrain-fillingstage，thea

3、ctivitiesofSOD，PODandCATintherootsofno—tillageorno—tillageareaofrootseparationtillagewerehigherthanthatofconventionaltillageorconventionaltillageareaofrootseparationtillage，respectively,whilethecontentofMDAintherootsofno·—tillageorno··tillageareaofrootseparationtillagewaslowerthanthatofconventionalt

4、illageorconventionaltillageareaofrootseparationtillage，respectively．Therefore，rootsuperioritywereobservedattheearlygrowthperiodforconvensionaltillagerice，whileitappearedatmiddleorlategrowthperiodforno·tillagerice．ThepHinrhizhopheresoilwassignificantlylowerthanthatinbulksoilofpaddyfields．ThepHinrhizh

5、opheresoilofno-tillagericewassignificantlylowerthanthatofconventionaltillagericeatelongationstage，whilethepHinrhizhopheresoilofno-tillagedeewassignificantlyhigherthanthatofconventionaltillagedeeatgrain·fillingstage．IVTheavailableNandPinrhizhopheresoilwerelowerthanthatinbulksoilofpaddyfields，whilethe

6、availableKinrhizhopheresoilwashigherthanthatinbulksoilofpaddyfields．TheavailableNwashigherandtheavailablePandKwerelowerintheinrhizhopheresoilofno-tillagericecomparedwiththatofconventionaltillagerice．changingtrendofinvertase(protease，urease，amylase)activityinbulksoilwassimilarwiththatinrhizhopheresoi

7、l．TheinvertaseactivityinbulksoilofconventionaltillageWashigherthanthatofno—tillageatbothjointingandgrain-fillingstages．Intherootseparatingcultivation，theinvertaseactivityofconventionaltillageWashigher