不同连栽代次桉树人工林土壤微生物群落结构及多样性研究

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中图分类号：S792.39 文献标志码：A

Abstract：【Objective】Toexplore the efectsanddriving mechanismsof successiveplantingonsoil microbialcommunities in Eucalyptuplantations.【Method】Usinghig-throughputsequencing，thisstudyanalyedthestructureanddiversityofsoilbcterial and fungal communitiesacross four successive planting generations of Eucalyptusurophylla ×E grandisplantationsinLeizhou peninsula.Bycombining withthedeterminationofsoilchemicalproperties，theinterlinkagesbetweensoilmicrorganismsand environmental factors were also elucidated.【Result】1）Although fungal ACE，Chaol，and Shannon indices in the 40-80cm layer were significantlyighrinG2taninothgeneratios，ucessveplantingeertednognifant efectosoilmicrobialalhadivesity However，itsgantlyleedmicoalomuitysrucres;2）allollstedantbcteralylainachatio werePseudomoadotacidobacterotClorofeindctioetotahileeoantfungalpylaresidootad

Ascomycota.In the 0-40cm soillayer，with successive planting generations，therelative abundance of the soil bacterium Candidatus_ Eremiobacteatlasdsttintesicedta.Ialityai abundanceofscomcotaehbitedapronounceddownardtrendwhereasBasidiomycotaowedaninitialdecreasefollowedbyan increase，withsigfcantintegeeratioaldifrecesibundae3）Finingsfrocoelatioaddudacalydindcated notable interconnections between soil microbial communities and physicochemical properties.Soil pH ，availablenitrogen（AN）， availablephosphorus（AP）andavailableboron（AB）wereidentifedaskeyenvironmentalfactorsdrivingtheevolutionofsoilmicobial communitystructure; 4）Theresultsofpartialleastsquares path model（PLS-PM）showedthatsucessive planting hadasignificant directnegativefectonsoilemicalpropertisndfrtherhadsigniicantimpactoteompositionructureanddisityof soilbacterialandfungalcommuitiesthoughdirectorindirectefects.【Concusio】Tisstudyevealstheevolutionpaesofsoil microbialcommunityuctureandivesityidfentsucessieplatingeneatiosofEucalytuspantatiosrovdingtecal foundation for soil amelioration and sustainable silvicultural management of plantations.

Keywords：Eulyuspltatiocsipantgeeatioslobalmituctueolcalpog throughput sequencing technology

桉树Eucalyptusspp.是全球重要的速生用材树种之一，具有生长速度快、适应性强、经济价值高等优点，被广泛应用于制浆造纸、木材加工及生物质能源等领域[1]。（剩余24947字）