Effective prediction of soil organic matter by deep SVD concatenation using FT-NIR spectroscopy

作者：Qiao, Hanli; Shi, Xiubo; Chen, Huazhou^*; Lyu, Jingyi; Hong, Shaoyong

来源：Soil and Tillage Research, 2022, 215: 105223.

DOI：10.1016/j.still.2021.105223

• SVD-CNN
• OC
• TN
• Prediction
• FT-NIR spectroscopy

Soil organic matters (SOM), specifically carbon and nitrogen, bring numerous benefits to soil's physical and chemical properties. In this paper, we employ spectral data obtained by Fourier transform near-infrared (FT-NIR) spectroscopy to predict the content of organic carbon (OC) and total nitrogen (TN) in mineral soils. To address the limitation generated by massive hyperparameters on convolution neural network (CNN), we substitute using a technique named SVD concatenation to learn features. The proposed model combines the layers of fully connected and regression to complete the prediction task. We abbreviate it as SVD-CNN, which is capable provide a multi-tasks output simultaneously. In experiments, we study the prediction performances of SVD-CNN on two datasets of FT-NIR and LUCAS 2009 topsoil. Based on different situations, the highest performance of R-2 achieves 0.8891 for OC and 0.9048 for TN on the FT-NIR dataset. Similarly, the most prominent results on the LUCAS 2009 topsoil dataset are R-2 = 0.9304, RMSE = 3.6014 for OC and R-2 = 0.9319, RMSE = 0.2733 for TN. Furthermore, we also evaluate the results obtained by solely using SVD concatenation, which reveals SVD-CNN performs a better generalization ability.

• 单位
  广东金融学院; 桂林理工大学