资源描述：
《英汉论文摘要翻译》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、DiscussionandconclusionsThemainpurposeofthisstudywastodevelopanewmethodtoestimaterootbiomassusingrootdiameterandaveragerootdensity.Accordingtotheresultsofthefieldexperiment,forcoarserootofthesametreespecieswithdiameterslargerthan0.5cm,estimatedrootbiomasshadgoodagreementwit
2、hmeasuredvalues(R2>0.8).Resultssuggestthatthenewmethodcanfeasiblyestimaterootbi-omassfromrootdiameterestimatesbyGPRiftherootden-sityisapproximatelyconsistent.Thekeyfactorinestimatingbiomassisthepreciseesti-mationofrootdiameterbyGPR.Thus,wedevelopedarootdiameterestimationmod
3、elbasedonparameterΔTfrom2GHzfrequencyantennas.ThemajoradvantageofparameterΔTisthatitonlydependsonthegeometricdimensionofthereflectorandisindependentofsignalstrength.Asaresult,intheradarprofiles,ΔTisonlyrelatedtotheshapeofthereflectedwaveandisindependentofamplitude,whichde-c
4、reaseswithrootdepth.Accordingly,itcouldbeusedtopreciselyestimaterootdiameterwithoutconsideringtheeffectsofradarwaveattenuation.Forthesamereason,rootbiomassestimationbasedonestimateddiameterbytheGPRmodelisalsounaffectedbyrootdepthorradarsignalat-tenuation.Thisresultedinhighc
5、onsistencybetweenesti-matedandmeasuredvalueswithanR2largerthan0.8.Batnoretal.[20]usedsignalintensitytoestimaterootdi-ameterandbiomass,inwhichthedeterminationcoefficientsbetweentheextractedparameterandrootdiameteratdepthsof15cmand30cmwere0.81and0.55,respectively,andthedeterm
6、inationcoefficientwithrootbiomasswasonly0.55.Thiswasprimarilyduetotheinfluenceofradarsignalenergyattenuationwithdepth[20].Insubsequentstudies,researchersimprovedtheradardataprocessmethodandobtainedadeterminationcoefficientof0.68betweentheparameterandrootbiomass;however,iton
7、lyappliedtorootsatthesamedepth[22–24].Basedontheseresults,itisevidentthatthenewmethoddevelopedinourstudyismorerobustandaccuratethancurrentmodelsthatdirectlyesti-materootbiomassbysignalintensityofGPR.Insummary,themainconclusionsofthisstudyare:(1)rootdensityofUlmuspumila,atyp
8、icalplantinthestudyarea,isrelativelyuniformforrootswithdiameterslargerthan0.5cm(co
