蘋果砧木幼苗根系構(gòu)型及根區(qū)土壤生物學特性研究.pdf

1、山東農(nóng)業(yè)大學碩士學位論文蘋果砧木幼苗根系構(gòu)型及根區(qū)土壤生物學特性研究姓名：喬海濤申請學位級別：碩士專業(yè)：果樹學指導教師：楊洪強20090612蘋果砧木幼苗根系構(gòu)型及根區(qū)土壤生物學特性研究StudiesonrootarchitectureandbiologicalcharacteristicsofrhizosphereinapplestockAbstractTherootarchitectureofapplestock，andtheeff

2、ectofabioticstress，soiltypes，fertilizationandorganismonrootarchitectureandbiologicalcharacteristicsofrhizospherewithseedlingandperennialapplestocktakenasmaterialshavebeenstudiedinthisarticle，byusingthecombinedmethodsofwa

3、terculture，sand—culture，soilcultureinpotandorchardexperimentsTheresultsaleasthefclIlows：1Thetotallength，lateralrootlength，avgdiamten，surfaceareaandvolume，ProlinecontentofthedroughtresistantyoungseedlingsofMalussieversii(

4、Ledeb)Roemwerehigherthanthedrought—sensitiveyoungseedlingsofMalushupehensisRehd，butlowerMDAcontentTheproportionoffinerootandthevalueoffractaldimensiondecreasedwiththeenhancementofPEGconcentration2ThevalueofFD，proportiono

5、ffineroot，totallengthtaprootandlateralrootlength，avgdiamten，surfaceareaandvolumeofrootsweredecreasedinalltreatmentswitlltheenhancementofsaltstressintensity3Theproportionoffreerootincreasedsignificantlytherootdiameterandt

6、hefractaldimensiondecreasedsignificantlytheanglebetweenmainrootandfirstlateralrootenlarged，androottendstohorizontaldistributionundernitrogendeficientorirondeficientconditionTherootfractaldimensioniniron—deficientconditio

7、nislessthanthatinnitrogendeficient410—20mgL。1cadmiumchloridedecreasedsignificantlytheFractaldimension(FD)ofroots，taprootlength，surfaceareavolumeanddiameterofrootsandtheproportionoffreerootsThedegreeofdecreaserosewiththei