Spectroscopy and Spectral Analysis, Volume. 41, Issue 10, 3069(2021)
Inversion of Soil Organic Matter Fraction in Southern Xinjiang by Visible-Near-Infrared and Mid-Infrared Spectra
Figures & Tables(5)
Fig. 1. VNIR (a) and MIR (b) reflectance spectra of soil organic matter and fractions
Fig. 2. Correlations between soil organic matter content and visible-near infrared (a), mid-infrared (b) reflectivity
Fig. 3. Scatter plots of predicted
Table 1. Statistics of soil organic matter and fractions
View tableView in ArticleTable 1. Statistics of soil organic matter and fractions
测定指标 单位 样本数 平均值/
(g·kg-1)标准差/
(g·kg-1)最大值/
(g·kg-1)最小值/
(g·kg-1)峰度/
(g·kg-1)变异
系数/%有机质 (g·kg-1) 93 27.24 12.50 68.02 12.52 1.43 45.87 胡敏素 (g·kg-1) 93 21.81 10.87 59.50 9.44 2.61 49.86 富里酸 (g·kg-1) 93 1.65 1.00 4.90 0.05 1.68 60.56 胡敏酸 (g·kg-1) 93 2.52 1.48 8.59 0.72 2.63 58.75
Table 2. Construction and verification of PLSR, SVM, and RF models based on different spectra
View tableView in ArticleTable 2. Construction and verification of PLSR, SVM, and RF models based on different spectra
光谱 模型 精度指标 有机质/(g·kg-1) 胡敏素/(g·kg-1) 胡敏酸/(g·kg-1) 富里酸/(g·kg-1) 建模 预测 建模 预测 建模 预测 建模 预测 VIS-NIR PLSR R2 0.80 0.77 0.83 0.81 0.82 0.81 0.85 0.85 RMSE 5.17 5.73 4.33 4.37 0.53 0.67 0.37 0.40 RPIQ 2.39 2.37 2.73 2.72 2.92 2.87 3.46 2.81 RF R2 0.83 0.81 0.93 0.92 0.93 0.92 0.80 0.76 RMSE 4.14 3.96 2.44 2.66 0.34 0.34 0.35 0.36 RPIQ 3.36 2.36 4.87 4.61 4.75 3.93 4.00 3.10 SVM R2 0.75 0.73 0.80 0.77 0.71 0.70 0.83 0.80 RMSE 4.59 5.74 4.11 4.15 0.62 0.65 0.32 0.39 RPIQ 2.70 2.37 2.96 2.86 3.18 2.95 4.09 2.90 MIR PLSR R2 0.78 0.75 0.82 0.81 0.74 0.74 0.90 0.88 RMSE 5.42 5.55 4.41 4.45 0.60 0.66 0.30 0.40 RPIQ 2.95 2.42 2.68 2.67 2.67 2.56 4.38 2.82 RF R2 0.87 0.86 0.89 0.87 0.88 0.86 0.94 0.94 RMSE 3.87 2.51 2.64 3.79 0.42 0.33 0.22 0.24 RPIQ 3.89 1.91 4.51 2.75 3.62 4.56 6.08 4.41 SVM R2 0.80 0.78 0.78 0.77 0.74 0.74 0.80 0.76 RMSE 5.04 5.24 3.94 4.40 0.62 0.71 0.36 0.44 RPIQ 2.46 2.59 2.99 2.70 2.49 2.71 3.64 2.59 VIS-NIR-MIR PLSR R2 0.80 0.78 0.85 0.81 0.83 0.80 0.86 0.80 RMSE 4.78 5.01 3.63 4.35 0.53 0.67 0.39 0.71 RPIQ 2.79 2.71 3.25 2.73 2.83 2.87 3.63 2.07 RF R2 0.92 0.90 0.88 0.87 0.89 0.89 0.87 0.87 RMSE 2.90 4.08 2.96 2.84 0.41 0.33 0.31 0.31 RPIQ 4.52 3.51 4.14 2.63 3.65 4.58 3.99 4.28 SVM R2 0.86 0.85 0.87 0.85 0.84 0.83 0.85 0.83 RMSE 3.81 4.07 3.60 3.69 0.44 0.52 0.30 0.41 RPIQ 3.25 3.34 3.28 3.22 3.68 3.67 4.28 3.44
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De-fang LUO, Jie PENG, Chun-hui FENG, Wei-yang LIU, Wen-jun JI, Nan WANG. Inversion of Soil Organic Matter Fraction in Southern Xinjiang by Visible-Near-Infrared and Mid-Infrared Spectra[J]. Spectroscopy and Spectral Analysis, 2021, 41(10): 3069
Paper Information
Category: Research Articles
Received: Sep. 4, 2020
Accepted: --
Published Online: Oct. 29, 2021
The Author Email: LUO De-fang (zkyldf@163.com)
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