学科分类
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2 个结果
  • 简介:BasedontheresultsofmonitoringtheenvironmentofChinaNationalAfforestationProject(NAP)andtheinvestigationoninsectpestsanddiseasesin1.2millionhaofplantations,theauthorelaboratestheareas,speciesandcausesofinsectpestsanddiseasesoccurringintheproject'sareasandprovidesfundamentaltheoryforguidingenvironmentalprotectionandplantationestablishmentinasoundway.Sincetheproject'sactivitiesstrictlyfollovvedtheguidelineofenvironmentalprotectioninpast...

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  • 简介:PhyllostachyspraecoxC.D.ChuetC.S.Chao,afavoredbambooshootspecies,hasbeenwidelyplantedinrecentyears.Fourstandswithdifferenthistoricalmanagementpracticeswereselectedforthisstudytounderstandtheevolutionofsoilmicrobialecologybydeterminingtheeffectsofanewmulchingandheavyfertilizationpracticeonsoilqualityusingmicrobiologicalparameters.Comparedwiththetraditionalpractice(index1),microbialbiomasscarbon(MBC)andsoilmicrobialrespirationcarbon(MRC)withthenewmanagementpracticesignificantlydecreased(P<0.01andP<0.05,respectively)with1-2yearsofmulching(index2)andthenforcontinuedmulchingsignificantlyincreased(P<0.05).TheratiosofMBC/TOC(totalorganiccarbon)andMRC/TOCalsosignificantlydiminished(P<0.05)withmulching.Theaveragewellcolordevelopment(AWCD)andShannonindexdecreasedwithmulchingtime,andthesignificantdecrease(P<0.05)inShannonindexoccurredfromindex2toindex3.Theresultsfromaprincipalcomponentsanalysis(PCA)showedthatthescoresofthefirstprincipalcomponentforindexes1and2weresignificantlylarger(P<0.05)thansoilsmulched3-4yearsor5-6years.Also,thesecondprincipalcomponentscoresforindex1werelargerthanthoseforindex2,suggestingthattheabilityofsoilmicroorganismstoutilizesoilcarbonwasdecreasingwithlongeruseofthenewmanagementpracticeandcausingadeteriorationofsoilbiologicalproperties.

  • 标签: 微生物 碳含量 功能差异 碳呼吸 土壤学