1、中國(guó)農(nóng)業(yè)大學(xué)博士學(xué)位論文丘陵紅壤蔗區(qū)土壤性質(zhì)時(shí)空變異特性和甘蔗生長(zhǎng)模型應(yīng)用姓名：黃智剛申請(qǐng)學(xué)位級(jí)別：博士專(zhuān)業(yè)：土壤學(xué)指導(dǎo)教師：李保國(guó)20070601AbstractThespatio—temporalvariationsofitsphysicalandchemicalpropertiesonfarmscaleredsoilofsugarcaneinsubtropicalhillyareasoVer19yearsfrom1980to199

2、9wereidentifiedandcharacterizedthroughusingtheapproachofGeographicalInformationSystems(GIS)coupling謝lllgeostatisticsmethodsSimulationsandvalidations011sugarcanegrowthWgredonebyusingmechanisticsugarcanegrowthmodelAPSIM—Su

3、garcaneTheoptimizednitrogenandwatermanagementstrategiesonfarm—scalesugarcenewerethusproposedthroughcombiningtheresearchresultsobtainedfromabovetwostudiesthespatiotemporalvariationsofsoilpropertiesandtheAPSIMSugarcanesimu

4、lateddynamicsofwaterandnitrogenrequirementsofsugarcaneThechiefresearchresultsa∞asfollows：1Thespatialvariationsofsoftpropertiesatfarmscalesugarcanefieldsin1980accordedwiththespatialdistributionpatternsoflandusagetypes，cul

5、tivationandmanagementstrategiesandsoilerosionsAfter19consecutiveyearsofsugarcaneplantationtheregionalacidificationofsoftsinsugarcanefieldshadbeenexhibitingallaggravatingtrendthereasonofwhichseelllStObeattributedtothemono

6、—sourcefororganicinanuresandthenitrificationsarisingfromnitrogenfertilizationThecontentsofsoilorganicmatters(SOM)andsoilmacronutrientsWeleenhancedtoSOmevaryingdegrees，howeverthemediuandmicronutrientswerestillatalowlevel，

7、especiallyforBorondeficiencywhichiscausedbyoVenl辯ofSiCaandMgfertilizerandlimeconcentratinginlocalareasThespatialdistributionofsoilpropertiesWasconsistentwiththespatialdistributionpatternsofcropsandthetypesandmagnitudeoff

8、ertilizerapplicationadoptedbythestudiedsugarcanefarmwhichisalseflectedOilinterpolationresultsThemediumlevelsoilnutrientsWasobservedacTOSStheentiresugarcanefarmland2Thesoilreadilyavailablenitrogenhadbeendepletingaroundthe

9、croppingseasonindicaimgthattheni仕ogonwasunderasedButothersoilnutrientswerewellbalancedThesp撕o衄砷oralvariationswereobservedOilallofthesoilpropertiesunderinvestigationMostofthesoilpmpertiesdisplayedintrapmpertycorrelationsa

10、ndthecorrelationwithsugarcane’Sagronomicproperties(stemdiameter；weightofastemandstemlength)andwithlandform白ctorsTheagronomicpropertiesallexhibitedsimilarpatternsonspatialdistribution3Themeasuredsugarcanegrowth，soilmoistu

11、recontentandsoilnitrogencontentwerevalidatedagainstthesimulatedresultedbyAPSIM—Sugarcane，theresultsofwhichindicatedthattheregressionbetweenmeasuredandsimulatedLAI，abovegrounddrybiomass，nitrogencontentofsugarcaneleavesand

12、topsoilmoistureallapproximatedtothe1：1line，withtheR2allabove08，andallwithsignificantlevelThesimulatesugarcanegrowthandthegrowthenvironmentofsugarcanefarmlandsarcconsistentwiththerealsugarcanecultivationpractice4Thefields

13、calesugarcanecultivationsinthreeconsecutiverotations0lantsugarcaneandthefirstratoonsugarcane)lastingfrom2003to2005weresimulatedbyusingAPSIM—SugarcaneForplantsugarcane，duetothemodestrainfallduringtheperiodofOctoberandNove