南方稻田土壤微生物量碳、磷及其對磷轉(zhuǎn)化的影響.pdf

1、華中農(nóng)業(yè)大學碩士學位論文南方稻田土壤微生物量碳、磷及其對磷轉(zhuǎn)化的影響姓名：黃敏申請學位級別：碩士專業(yè)：土壤學指導教師：李學垣吳金水2002.5.1ABSTRACTInthisthesisthefumigation—extractionmethodsformeasuringthemicrobialbiomassphosphorus(MB—P)inpaddysoilsselectedfromHunanandHubeiprovinceswer

2、evalidated；incubationexperimentstoinvestigatethemicrobialtransformationofphosphateinpaddysoilswerecarriedoutbyamendingorganicmaterialsrasG：59glucose；5S：59ricestraw；10S：109ricestrawperkgoven—drysoil)inredpaddysoilswithorw

3、ithouttheinoculationofphosphaticumandbymonitoringchangesinsoilMB—Psoilmicrobialbiomasscarbon(MB—C)，andfractionsofinorganicphosphorusduringaperiodof60days；TherelationshipsbetweenMB—Pandphosphate，organiccarbonorcropyieldin

4、thepaddysoilscollectedfrom9long—termfieldexperimentalplotsinHunanProvincewerestudiedThesestudieshaveimportantsignificancesinscientificandpracticalfieldforimprovingsoilfertilityandenviromentalqualitySomemainresultsandprog

5、ressionswereillustratedasfollows：1TheresultsshowedthatasthefactortocorrecttheflushofinorganicphosphorusrenderedbythefumigationinchloroformandextractedinNaHC03intotheamountofMBPinthesoil，therecoverypercentageofaddedmicrob

6、ialbiomassphosphorus(Rmb)wasmoreaccuratethanthatofaddedinorganicphosphorus(Rpi)ThecorrectingfactorofRpi(Kp=04)mayunderestimatethereleaseofMB—PinthepaddysoilsofsouthChina2IntreatmentsamendedorganicmaterialssoilMBCreachedt

7、heirpeakamountsby3daysofincubationThen，soilMB—CinGand10Sdecreasedobviouslyandkeptthelowerlevelvalueafter11daysBycomparedthecontrol，changesofsoilMBPweredifferedwithvariousamendments，asforGtheamountofsoilMBPreachedtheirmax

8、imumby21days，for5Sby31days，andfor10Sby14daysThen，theymaintainedstableafterthetimethatthemaximumwerereachedTheamountofavailablephosphorusinthesoilamendedglucose(G)decreasedsignificantlywhileinsoilsamendedsnawitwasmaintain

9、edcomparabletothecontr01Thiswaspossiblybecausethegrowthofmicrobialbiomassfollowinganamendmentoforganicmaterialswithoutphosphorus(glucose)wouldllseavailablephosphorusinthesoilsAfter43daysofincubation，soilMB—Pincreased12fo

10、ldsin5S，Gand10SAttheSalTletime，theamountofAl一PorFe—PinGandin10SdecreasedsignificantlyTheseindicatethatwhenthesoilmicrobialbiomassdevelopslargelyastheamendmentoforganicmaterials，phosphorusthatisoriginallyfixedbyA1andFemay