基于一阶微分变换方法的南方丘陵稻田土壤电阻率高光谱特性研究  

The Spectral Characteristics of High Soil Resistivity in Paddy Fields in Southern China Hilly Areas

作　　者：郭熙[1,2,3] 谢碧裕 叶英聪 谢文[3] 

机构地区：[1]江西省农业科学院土壤肥料与资源环境研究所,江西南昌330200 [2]中国农业科学院农业资源与农业区划所,北京100081 [3]江西农业大学国土资源与环境学院,江西南昌330045

出　　处：《江西农业大学学报》2015年第1期190-198,共9页Acta Agriculturae Universitatis Jiangxiensis

基　　金：国家"十二五"科技支撑计划项目(2012BAD04B11);江西省博士后择优资助项目

摘　　要：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。This study used soil conductivity and spectra mensuration to analyse the characteristics of paddy 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 transformation 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 absorption 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 correlation 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.

关 键 词：一阶微分变换 南方丘陵稻田土壤 土壤电阻率 高光谱特性 

分 类 号：S153.2[农业科学—土壤学] TP70[农业科学—农业基础科学]