南方稻田土壤微生物量碳、磷及其對(duì)磷轉(zhuǎn)化的影響.pdf

1、華中農(nóng)業(yè)大學(xué)碩士學(xué)位論文南方稻田土壤微生物量碳、磷及其對(duì)磷轉(zhuǎn)化的影響姓名：黃敏申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：土壤學(xué)指導(dǎo)教師：李學(xué)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