凋落物管理和城市环境胁迫对湿地松林土壤氮素矿化过程的耦合效应沈文清

20113361236－1241http//xuebao．jx[e-mail]1233331．3300462．3300383．330031“——”PinuselliottiiPVCN。NH4+－N。NNO3－－N。NN、NN。S791．246A1000－2286201106－1236－06InteractiveEffectsofLitterRemovalandUrbanizationEnvironmentChangeonSoilNitrogenMineralizationinSlashPinePlantationsSHENWen-qing1YUMing-quan2HUXiao-fei3FENGXue3RENWen3CHENFu-sheng31．OfficeoftheMountain-River-LakeDevelopmentCommitteeofJiangxiProvinceNanchang330046China2．CollegeofLifeSciencesJiangxiScienceandTechnologyNormalUniversityNanchang330038China3．JiangxiKeyLaboratoryofPlantResourcesNanchangUniversityNanchang330031ChinaAbstractTheeffectsoflittermanagementpracticeandurbanizationenvironmentchangeonsoilnitrogenNtransformationanditsavailabilitywerestudiedinslashpinePinuselliottiiplantationsacrossurban-suburban-ruralgradientsofNanchangCityusinginsituPVCtubeincubationmethod．TheresultsshowedthatlitterremovalwouldinhibitnitrificationanddecreasesoilNH4+－Nconcentrations．UrbanizationwouldleadtoaccelerationofsoilNtransformationrateandespeciallyimprovenitrificationrateandsoilNO3－－Ncon-centration．Theinteractiveeffectsoflitterremovalandurbanizationenvironmentpressurewerefoundonthea-mountcomponentsandseasonalityofsoilNmineralizationrateandNavailability．ThereforelitterremovalinurbanforestswouldbehelpfultoalleviatethenegativeurbanizationinfluenceonNcyclinghoweverlitterin-putinruralforestshouldbeagoodwaytoincreasesoilNmineralizationandNavailability．Insumurbanfor-estsmanagementwoulddifferwiththatintraditionalforestry．2011－07－012011－10－2230960311306004731974—[e-mail]。6Keywordsurbanforestsoilnitrogenmineralizationtoptubeincubationmethodecosystemmanage-mentNNNN、N1。N1－4。5。6。、、、、、N7－8。N9。“——”6PinuselliottiiPVCN、N1NNN2N、NN3NN。N。11．1115°27'～116°35'28°09'～29°11'17．5℃1600～1800mm77%1901h2．5m/s291d10。10530km。、220m×20m6600～800/hm212～16cm180．7～0．9。Ligustrumquihoui、Mahoniafortunei、PyracanthafortuneanaQuercusglanduliferavar．brevipetiolata、Gardeniajasminoides、Phyllanthusglaucus、Castanopsissclerophylla、Albizziakalkora。、133＞2。1。10～15cmTab．1Thepropertiesoftopsoil0－15cminourstudysitesPlots/g·cm－3BulkdensitypHpHvalue/mg·g－1Organiccarbon/mg·g－1Totalnitrogen/mg·g－1TotalphosphorusC∶NratioN∶PratioUrbanNolitterraking1．33±0．01d4．50±0．02ab6．37±0．39c0．58±0．02c0．25±0．02cd14．43±0．53ab2．64±0．17bLitterremoval1．38±0．02d4．61±0．02ab0．94±0．09a0．17±0．02a0．23±0．02cd5．64±0．58a0．78±0．11aSuburbanNolitterraking1．25±0．01c4．64±0．04b13．76±1．54d0．42±0．08bc0．27±0．01d40．38±5．84c1．55±0．29abLitterremoval1．10±0．02b4．57±0．02ab6．20±0．47bc0．24±0．0．4ab0．19±0．01bc29．15±3．63bc1．29±0．27abRuralNolitterraking1．04±0．04a4．48±0．04a12．52±0．35d1．02±0．06d0．15±0．01ab12．48±0．66ab7．02±0．58cLitterremoval0．98±0．08a4．63±0．05b4．61±0．92b0．25±0．03a0．12±0．01a25．50±9．21abc2．05±0．12ab±P＜0．05。Mean±StandarderrorDifferentlettersinthesamecolumndenotesignificantdifferencesamongsixplotsatP＜0．05．·7321·331．21．2．1620m×20m410m×10m2．5cm50～15cm。8。1．2．2PVC11。2007110215cm、4cmPVCNH4+-NNO3－-N30d。1200821012。NNH4+-N+NO3－-NN。1．2．3C－NP－pH1∶2pH。NH4+-NNO3－-NNH4+NO3－-N－12。。1．3mg·kg－1·d=30dNH4+-N－NH4+-N÷301mg·kg－1·d=30dNO3－-N－NO3－-N÷302mg·kg－1·d=30dNH4+-N+NO3－-N－NH4+-N+NO3－-N÷3033、4、56、7、89、10、1112、1、2。SPSS11．0“——”、、、P＜0．05。22．1NNH4+-N、NH4+-N、NO3－-NN2。NH4+-N、NO3－-NNNH4+-NNO3－-NN2、Tab．2ANOVAofeffectsoflittermanagementurban-ruralgradientandsamplingseasononsoilmineralNconcentrationandNmineralizationrateinslashpineplantationsFactorsdfFFvalueNH4+－NNO3－－NNMineralNAmmoniaficationrateNitrificationrateNet-NmineralizationrateLittermanagementLM117．34＊＊＊337．95＊＊＊199．94＊＊＊48．67＊＊＊0．00NS3．97*Urban-ruralgradientURG221．85＊＊＊446．98＊＊＊386．17＊＊＊31．13＊＊＊43．17＊＊＊23．21＊＊＊SamplingseasonSS32．54NS55．05＊＊＊47．09＊＊＊14．03＊＊＊6．08＊＊＊10．27＊＊＊×LM×URG220．33＊＊＊83．75＊＊＊37．76＊＊＊3．22＊＊＊＊4．57*6．59＊＊×LM×SS33．48*22．11＊＊＊11．34＊＊＊4．52＊＊2．12NS0．72NS×URG×SS612．59＊＊＊14．43＊＊＊16．33＊＊＊12．44＊＊＊12．23＊＊＊15．44＊＊＊××LM×URG×SS126．49＊＊＊8．99＊＊＊8．03＊＊＊7．76＊＊＊0．69NS0．98NS·8321·6。Differentlettersinthesameseasondenotesignificantdifferencesamongthreesitesacrosstheurban-suburban-ruralgradientatP＜0．05．1“——”Fig．1SeasonalvariationsinsoilmineralNinslashpineplantationsofdifferentlittermanagementsacrossurban-suburban-ruralgradientinNanchangCity、1。NH4+-N、NO3－-NN、。NH4+-NNH4+-NNO3－-NN1。NO3－-N0．820．71～0．790．840．810．180．860．61。2．2、、、、、、1。、、、、、。、、、、。、、2。2。3N、、、7。·9321·33。Differentlettersinthesameseasondenotesignificantdifferencesamongthreesitesacrosstheurban-suburban-ruralgradientatP＜0．05．2“——”Fig．2SeasonalvariationsinsoilNmineralizationrateinslashpineplantationsofdifferentlittermanagementsacrossurban-suburban-ruralgradientinNanchangCity、、、、、、、6。13。N。、N。1NH4+-NNO3－-N、N、。2NH4+－NNO3－-N、N、。3NNNH4+-N。NNN14－15INNN。“——”N。1NO3－-N、N、——N。NNNNN13－16pHNH4+-NNO3－-N17。2NH4+-N、NO3－-NN、、·0421·6。、、、18N2。3NNNO3－-NN、。IIN、NN。NO3－－NNNO3－-N18－1920。NN21。N。N。、、—、N。。1．J．2006262341-348．2ZhuWXCarreiroMM．Temporalandspatialvariationsinnitrogentransformationsindeciduousforestecosystemsalonganurban-ruralgradientJ．SoilBiology＆Biochemistry200436267-278．3．、J．20092071529-1535．4．J．2009312278-282．5McDonnellMJ