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ID:6049423
大小:45.00 KB
页数:18页
时间:2018-01-01
《褐土参数高光谱反演探究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、褐土参数高光谱反演探究 摘要:土壤反射光谱的研究是土壤学研究的热点之一。以石家庄市饮用水源二级保护区褐土为研究对象,测定了研究区36个土壤样本的3个指标(pH、有机质、全盐量)和其可见光近红外波段(400~900nm)的光谱特征,对反射光谱进行5种变换(反射率的一阶导数、倒数及其一阶导数、倒数对数及其一阶导数),通过单相关分析,选取最佳变换进行主成分分析,最后利用多元逐步线性回归建立3种定量估算模型,对比找出最优模型,并进行检验。结果表明,研究区400~900nm波段光谱及其5种变换形式中,土壤反射率倒数对数的一阶导数与pH相关性最好,671~680nm波段相关系数最大为0.
2、54;反射率倒数一阶导数与有机质的相关性最好,441~450nm波段相关系数最大为0.32;反射率及其一阶导数与全盐量的相关性最好,891~900nm和851~860nm波段相关系数较大,分别为0.60和0.68。土壤pH的反射率模型决定系数最大为0.79,验证精度为0.026,有机质的一阶导数模型决定系数最大为0.78,验证精度为0.350,全盐量模型一阶导数模型最优,决定系数为0.731,验证精度为0.529。关键词:褐土;高光谱;反演;多元逐步回归中图分类号:S127;S11+4;S151.9+5文献标识码:A18文章编号:0439-8114(2013)12-2757-0
3、6HighSpectralInversionofCinnamonSoilParametersLIUZheng,HANChen-xia,ZHAOXu-yang,MAYan-yan(DepartmentofResourcesandEnvironment,ShijiazhuangUniversity,Shijiazhuang050035,China)Abstract:Thestudyonsoilreflectancespectralisoneofthehotspotsinsoilscience.Selectingthecinnamonsoilinthesecond-levelprot
4、ectionzoneofdrinkingwatersourceinShijiazhuangcityastheobjectofstudy,pH,thecontentoforganicmatterandtotalsalt,andthenearinfrared(400~900nm)spectrumfeaturesof36soilsamplesweremeasured.Then5kindsoftransform(reflectivityderivative,reciproalanditsderivative,reciproallogarithmicanditsderivative)on
5、reflectionspectrumweremade.Thebesttransformwasselectedbysinglecorrelationanalysisandtheprincipalcomponentsanalysiswasconducted.Finally,threequantitativeestimationmodelswereestablishedusingthemultivariategraduallylinearregressionandmeasured.Theresultsshowedthatthe18correlationbetweensoilrefle
6、ctivityreciprocallogarithmicderivativeandpHwasthebestandthecorrelationcoefficientwasupto0.54at671~680nmband.Thecorrelationbetweenreflectivityreciprocalofthefirstderivativeandtheorganicmatterwasthebest,andthemaximumcorrelationcoefficientwas0.32at441~450nmband.Thecorrelationsbetweenthereflecta
7、nceanditsfirstderivativecorrelationandthetotalsaltcontentwerethebest,themaximumcorrelationcoefficientsat891~900nmand851~860nmbandwere0.60and0.68respectively.ThedeterminationcoefficientofthesoilpHreflectancemodelwas0.79anditsverifyaccuracywas0.026.T
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