CAJ | 학술논문

通过对土壤电导率和光谱测定，分析了南方丘陵稻田土壤电阻率特征、原始光谱数据及重采样光谱数据特征。在光谱重采样基础上进一步构建光谱包络线去除变换、光谱反射率倒数（1／R）、对数[ ln（1／R）]、平方根（ R0．5）、一阶微分等单一或复合变换模型。通过横向、纵向综合比较分析不同模型的反射率与电阻率相关性分析的曲线差异，着重探讨了基于一阶微分的数据变换模型间土壤电阻率与光谱反射率间相关性强弱，结果表明：（1）基于一阶微分变换的模型可以对重叠混合光谱进行分解以便识别，扩大样品之间的光谱特征差异，发掘敏感波段的光谱吸收、反射特征；（2）综合反射率的平方根的一阶微分变换、反射率的倒数的对数及反射率对数的一阶微分等模型得出，在波段为382 nm处，土壤电阻率与光谱反射率间相关系数最高达0．788，在波段为555～560 nm，多个微分变换模型相关性系数在0．7以上，可为后续反演因子的确定及土壤电阻率高光谱估测回归模型的建立提供参考。
통과대토양전도솔화광보측정，분석료남방구릉도전토양전조솔특정、원시광보수거급중채양광보수거특정。재광보중채양기출상진일보구건광보포락선거제변환、광보반사솔도수（1／R）、대수[ ln（1／R）]、평방근（ R0．5）、일계미분등단일혹복합변환모형。통과횡향、종향종합비교분석불동모형적반사솔여전조솔상관성분석적곡선차이，착중탐토료기우일계미분적수거변환모형간토양전조솔여광보반사솔간상관성강약，결과표명：（1）기우일계미분변환적모형가이대중첩혼합광보진행분해이편식별，확대양품지간적광보특정차이，발굴민감파단적광보흡수、반사특정；（2）종합반사솔적평방근적일계미분변환、반사솔적도수적대수급반사솔대수적일계미분등모형득출，재파단위382 nm처，토양전조솔여광보반사솔간상관계수최고체0．788，재파단위555～560 nm，다개미분변환모형상관성계수재0．7이상，가위후속반연인자적학정급토양전조솔고광보고측회귀모형적건립제공삼고。
This study used soil conductivity and spectra mensuration to analyse the characteristics of pad?dy soil resistivity,original spectral data and resample spectra data of Southern China hilly paddy fields. Single or comprehensive models of spectra continued removed data, the reciprocal value, logarithm, square root and first ore differential value of soil spectra reflectivity were built based on the spectra resample method.According to the transverse and longitudinal analysis of the correlation curve of different models,the correlation between soil conductivity and spectra reflectivity was probed attentively based on the first order differential data trans?formation model.The result showed that:(1) the mode based on the first order differential could discompose and identify overlapping spectra,amplify the spectra characteristics between samples,explore the spectra ab?sorption and reflectance characteristics of sensitive bands;( 2 ) the models of the first order differential of square root,the logarithm of reciprocal value,the first order differential of logarithm value implied that the cor?relation coefficient reached 0.788 in the band 383 nm and the correlation coefficient keeps above 0.7 in the band range from 555 to 560 nm.These results give reference for the determination of the subsequent inversion factors and the building of high spectra soil resistivity regression model.