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标题：QUANTITATIVE ASSESSMENT OF SOIL PARAMETERS IN WESTERN TAJIKISTAN USING A SOIL SPECTRAL LIBRARY APPROACH
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作者：B. Seiler ; M. Kneubühler ; B. Wolfgramm 等
期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2007
卷号：XXXVI-7/C50
出版社：Copernicus Publications
摘要：SoildegradationisamajorproblemintheagriculturallydominatedcountryofTajikistan,whichmakesitnecessarytodetermineandmonitorthestateofsoils.Forthispurposeasoilspectrallibrarywasestablishedasitenablesthedeterminationofsoilpropertieswithrelativelylowcostsandeffort.Atotalof1465soilsampleswerecollectedfromthree10x10kmtestsitesinwesternTajikistan.ThediffusereflectanceofthesampleswasmeasuredwithaFieldSpecPROFRfromASDinthespectralrangefrom380to2500nminlaboratory.166sampleswerefinallyselectedbasedontheirspectralinformationandanalysedontotalCandN,organicC,pH,CaCO3,extractableP,exchangeableCa,MgandK,andthefractionsclay,siltandsand.Multiplelinearregressionwasusedtosetupthemodels.Twothirdofthechemicallyanalysedsampleswereusedtocalibratethemodels,onethirdwasusedforhold-outvalidation.VerygoodpredictionaccuracywasobtainedfortotalC(R2=0.76,RMSEP=4.36gkg-1),totalN(R2=0.83,RMSEP=0.30gkg-1)andorganicC(R2=0.81,RMSEP=3.30gkg-1),goodaccuracyforpH(R2=0.61,RMSEP=0.157)andCaCO3(R2=0.72,RMSEP=4.63%).NomodelscouldbedevelopedforextractableP,exchangeableCa,MgandK,andthefractionsclay,siltandsand.Itcanbeconcludedthatthespectrallibraryapproachhasahighpotentialtosubstitutestandardlaboratorymethodswhererapidandinexpensiveanalysisis required
关键词：Soil; Sampling; Hyper spectral; Statistics; Correlation; Modelling; Prediction