• ISSN 1008-505X
  • CN 11-3996/S
卢艳丽, 白由路, 杨俐苹, 王磊, 王贺. 东北平原不同类型土壤有机质含量高光谱反演模型同质性研究[J]. 植物营养与肥料学报, 2011, 17(2): 456-463. DOI: 10.11674/zwyf.2011.0215
引用本文: 卢艳丽, 白由路, 杨俐苹, 王磊, 王贺. 东北平原不同类型土壤有机质含量高光谱反演模型同质性研究[J]. 植物营养与肥料学报, 2011, 17(2): 456-463. DOI: 10.11674/zwyf.2011.0215
LU Yan-li, BAI You-lu, YANG Li-ping, WANG Lei, WANG He. Homogeneity of retrieval models for soil organic matter of different soil types in Northeast Plain using hyperspectral data[J]. Journal of Plant Nutrition and Fertilizers, 2011, 17(2): 456-463. DOI: 10.11674/zwyf.2011.0215
Citation: LU Yan-li, BAI You-lu, YANG Li-ping, WANG Lei, WANG He. Homogeneity of retrieval models for soil organic matter of different soil types in Northeast Plain using hyperspectral data[J]. Journal of Plant Nutrition and Fertilizers, 2011, 17(2): 456-463. DOI: 10.11674/zwyf.2011.0215

东北平原不同类型土壤有机质含量高光谱反演模型同质性研究

Homogeneity of retrieval models for soil organic matter of different soil types in Northeast Plain using hyperspectral data

  • 摘要: 土壤有机质含量是反映土壤肥力的重要特征,利用高光谱技术对耕层土壤有机质(OM)含量进行定量化反演可为土壤信息化管理和精准施肥提供重要的依据。本文利用ASD FR 2500高光谱仪在室内条件下测定了风干土壤样品的可见近红外光谱,分析了东北平原不同土壤类型土壤光谱反射率曲线形状变化及土壤有机质含量的光谱反演模型,结果表明,根据土壤光谱反射率曲线变化特点可以初步将东北平原的几种土壤类型划分为三类,其主要区别在于460~1350nm范围内曲线斜率变化的差异。通过相关分析进一步确定了土壤有机质敏感波段为650~750nm,建立了不同土壤类型的有机质含量回归预测模型,并且对不同模型的回归系数和截距进行了方差同质性检验。结果显示,黑土和黑钙土、黑土和暗棕壤的模型没有显著差异,即可以分别构建同质性模型来简化有机质的预测,但是预测精度有所降低。

     

    Abstract: Organic matter (OM) content is an important index in reflecting soil fertility, and provides important information for soil digital management and precise fertilization if OM can be estimated using hyperspectral technology. In this experiment, NIR-Visible spectral reflectance of soil was measured using ASD FR 2500 hyperspectral meter. The spectral reflectance curve shapes and the OM prediction models of different soil types were analyzed. The results show that, according to the variation of spectral reflectance curves in the Northeast Plain, those soil types can be divided preliminarily into three categories, and their main differences are the curve slopes in 4601350nm. Further, the sensitive bands to SOM were determined as 650750nm by correlation analysis. The SOM regression models of different soil types were established using reflectance in the sensitive bands, and the homogeneity of variance is tested for regression coefficients and intercept. The results indicate that black and chernozem, and black and dark brown soil pass the homogeneity test respectively. Both of the two homogenous categories can be predicted using common models, but the predicting accuracy is slightly lower.

     

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