• Spectroscopy and Spectral Analysis
  • Vol. 39, Issue 6, 1986 (2019)
WANG Shi-fang1、2、3、*, HAN Ping1、3, SONG Hai-yan2, LIANG Gang1、3, and CHENG Xu2
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
  • 3[in Chinese]
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    DOI: 10.3964/j.issn.1000-0593(2019)06-1986-07 Cite this Article
    WANG Shi-fang, HAN Ping, SONG Hai-yan, LIANG Gang, CHENG Xu. Application of Slope/Bias and Direct Standardization Algorithms to Correct the Effect of Soil Moisture for the Prediction of Soil Organic Matter Content Based on the Near Infrared Spectroscopy[J]. Spectroscopy and Spectral Analysis, 2019, 39(6): 1986 Copy Citation Text show less

    Abstract

    Soil moisture has strong absorption in near infrared spectroscopy (NIRS) and causes interference in the prediction of the soil organic matter (SOM) content. In this paper, 41 dry soil samples were used to establish the SOM calibration model by PLSR, and 9 samples were used as the prediction set. All soil samples were rewetted to four different moisture contents (5%, 10%, 15% and 17%). The slope/bias (S/B) and direct standardization (DS) algorithms were used to correct SOM prediction results and whole-spectra obtained by different moisture content, eliminating the differences caused by soil moisture. The results showed that the bias reduced and prediction performances of the model were improved, with Rp higher than 0.89 and RMSEP lower than 0.885%. The study indicated that S/B and DS algorithm corrections could effectively remove the influence of soil moisture in NIRS and improve the accuracy of SOM predictions.
    WANG Shi-fang, HAN Ping, SONG Hai-yan, LIANG Gang, CHENG Xu. Application of Slope/Bias and Direct Standardization Algorithms to Correct the Effect of Soil Moisture for the Prediction of Soil Organic Matter Content Based on the Near Infrared Spectroscopy[J]. Spectroscopy and Spectral Analysis, 2019, 39(6): 1986
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