Soil & Water Res., 2023, 18(3):158-168 | DOI: 10.17221/133/2022-SWR

Strategies and methods for predicting soil organic matter at the field scale based on the provincial near infrared spectral databaseOriginal Paper

Shengyao Jia1,2, Chunbo Hong1,2, Hongyang Li1,2*, Yuchan Li1,2, Siyuan Hu3
1 College of Mechanical and Electrical Engineering, China Jiliang University, Hangzhou, P.R. China
2 Key Laboratory of Intelligent Manufacturing Quality Big Data Tracing and Analysis of Zhejiang Province, China Jiliang University, Hangzhou, P.R. China
3 Zhejiang Provincial Emergency Management Science Research Institute, Hangzhou, P.R. China

The development and provision of soil spectral library (SSL) could facilitate the application of near infrared (NIR) spectroscopy for economical, accurate, and efficient determination of soil organic matter (SOM). In this work, the performances of partial least squares regression (PLSR) and convolutional neural network (CNN) combined with the datasets of Zhejiang provincial SSL (ZSSL) and the feature subset (FS) were compared for the prediction of SOM at the target field. The FS dataset was chosen from ZSSL based on similarity to the spectral characteristics of the target samples. The results showed that compared with modelling using ZSSL, modelling using FS can greatly improve the prediction accuracy of the PLSR model, but the impact on the performance of the CNN model was limited. The method of mean squared Euclidean distance (MSD) was an effective way for determining the optimal spiking sample size for the PLSR model only using the spectral data of the spiking subset and the prediction set. The PLSR model combined with the FS dataset and the spiking subset determined by MSD achieved the optimal prediction results among all developed models, which is an accurate and easy-to-implement solution for the SOM determination based on ZSSL.

Keywords: convolutional neural network; soil organic content; soil spectral library; spiking sample size; strategy

Received: September 23, 2022; Accepted: June 14, 2023; Prepublished online: June 29, 2023; Published: August 31, 2023  Show citation

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Jia S, Hong C, Li H, Li Y, Hu S. Strategies and methods for predicting soil organic matter at the field scale based on the provincial near infrared spectral database. Soil & Water Res. 2023;18(3):158-168. doi: 10.17221/133/2022-SWR.
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