Abstract
This paper presents a novel method for estimating black-soil organic matter (SOM) in the black-soil zone of northeast China from hyperspectral reflectance models. Traditional black-soil property measurements are relatively slow, but the pressures of agricultural production and environmental protection require a quick method to collect black-soil organic matter content. SOM estimation using soil hyperspectral reflectance models can meet this requirement, based on the spectral characteristics of black-soil in Northeast China. On the basis of the spectral reflectance and its derivatives, hyperspectral models can be built using correlation analysis and multivariable statistical methods. The concepts of curvature and ratio indices are also applied to compare and test the stability and accuracy of data modeling. The results show that the response of black-soil spectral reflectance from 400–1,100 nm to organic matter content is more marked than that from 1,100–2,500 nm. Specifically, the main response range of black-soil organic matter is between 620–810 nm, with a maximal spectral response at 710 nm. By comparing different models, we found that the normalized first derivate model is optimal for estimating SOM content, with a determination coefficient of 0.93 and root mean squared errors (RMSE) of 0.18%.
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Liu, H., Zhang, Y. & Zhang, B. Novel hyperspectral reflectance models for estimating black-soil organic matter in Northeast China. Environ Monit Assess 154, 147–154 (2009). https://doi.org/10.1007/s10661-008-0385-4
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DOI: https://doi.org/10.1007/s10661-008-0385-4