研究目的
To evaluate the feasibility of Vis-NIR spectroscopy of intact soil cores for rapid determination of the four Fe forms: total Fe (Fet), pyrophosphate-extractable Fe (Fep), dithionite-citrate-bicarbonate extractable Fe (Fed), and oxalate-extractable Fe (Feo).
研究成果
Vis-NIR spectroscopy coupled with SVMR is suitable for quantitatively determining different Fe forms in intact soil cores of paddy fields. The nonlinear SVMR models outperformed the linear PLSR models for the predictions of all studied soil Fe forms.
研究不足
The study was limited to intact soil cores from paddy fields in Yujiang County, China. The variability in soil moisture and surface roughness could affect the prediction accuracy. The generalization of the models to other regions or soil types was not tested.
1：Experimental Design and Method Selection:
The study used Vis-NIR spectroscopy to analyze intact soil cores from paddy fields. PLSR and SVMR models were compared for predicting Fe forms.
2：Sample Selection and Data Sources:
A total of 148 intact soil cores from Yujiang County, China, were sampled. Vis-NIR spectra were recorded on four horizontal surfaces of each soil core.
3：List of Experimental Equipment and Materials:
FieldSpec 3 portable spectroradiometer with a spectral range of 350 to 2500 nm, high-intensity contact probe with a built-in light source.
4：Experimental Procedures and Operational Workflow:
Soil cores were sectioned and scanned in the laboratory. Spectra were recorded on four horizontal surfaces of each soil core. Calibration and validation sets were created using 70% and 30% of the samples, respectively.
5：Data Analysis Methods:
PLSR and SVMR models were used for data analysis. Model performance was assessed using RMSE, R2, RPD, and RPIQ statistics.
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