期刊
GEODERMA
卷 285, 期 -, 页码 280-292出版社
ELSEVIER
DOI: 10.1016/j.geoderma.2016.10.010
关键词
Spatial dependence; Partial least squares regression; Spatial model's; Visible and near-infrared diffuse reflectance; spectroscopy
类别
资金
- National Natural Science Foundation of China [41371227]
- Fundamental Research Funds for the Central Universities [2662016QD032, 2014205020202]
- Suzhou Applied and Basic Research Program for Agriculture [SYN201422]
Visible and near-infrared (VNIR) reflectance spectroscopy is a rapid, non-destructive, and cost-effective method for predicting soil properties. Partial least squares regression (PLSR) is a common method used to predict soil properties based on VNIR reflectance spectra. However, PLSR ignores the spatial autocorrelation of soil properties and the assumption of linear regression models, in which explanatory variables and model residuals should be independently and identically distributed. In this study, PLSR, partial least squares-geographically weighted regression (PLS-GWR), partial least squares regression Kriging (PLSRK), and partial least squares-geographically weighted regression Kriging (PLS-GWRK) were constructed to predict soil organic matter (SOM) based on soil spectral reflectance. In addition, this study explores the influence of the spatial non-stationarity of explanatory variables on prediction accuracy. Among the aforementioned models, PISA was used as a reference model; PLS-GWR considered the spatial autocorrelation of SOM and its auxiliary variables; PLSRK and PLS-GWRK considered the spatial dependence of the model residuals to ensure the usability of PLSR and PLS-GWR. A total of 256 topsoil samples (0-30 cm) were collected from Chahe Town, located in Jianghan Plain, China, and the reflectance spectra (400-2350 nm) of soil were used. The prediction capabilities of the models were evaluated using the coefficient of determination (R-2), the root-mean-square error (RMSE), and the ratio of performance to inter-quartile range (RPIQ). The evaluation indices showed that PLS-GWRK was the optimal model for predicting SOM using VNIR spectra. PLS-GWRK has the lowest values of RMSEC [0.109 In (g.kg(-1))] and RMSEP [0.223 In (g.kg(-1))] and the highest values of R-C(2) (0.933), R-P(2) (0.653), and RPIQ (3.015). PLS-GWR result showed that the spatial dependence of SOM and principal components could improve prediction accuracy compared with the PLSR result The result of PLSRK showed that the spatial dependence of the model residuals could influence the prediction accuracy of PLSR. The PLS-GWRK approach explicitly addressed the spatial dependency and spatial non-stationarity issues for interpolating SOM at regional scale. (C) 2016 Elsevier B.V. All rights reserved.
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