Including spatial correlation in structural equation modelling of soil properties

Angelini, Marcos Esteban; Heuvelink, Gerard B.M.
Publication Year
Published version
Digital soil mapping techniques usually take an entirely data-driven approach and model soil properties individually and layer by layer, without consideration of interactions. In previous studies we implemented a structural equation modelling (SEM) approach to include pedological knowledge and between-properties and between-layer interactions in the mapping process. However, it typically does not consider spatial correlation. Our goal was to extend SEM by accounting for residual spatial correlation using a geostatistical approach. We assumed second-order stationary and estimated the semivariogram parameters, together with the usual SEM parameters, using maximum likelihood estimation. Spatial prediction was done using regression kriging. The methodology is applied to mapping cation exchange capacity, clay content and soil organic carbon for three soil horizons in a 150100-km 2 study area in the Great Plains of the United States. The calibration process included all parameters used in lavaan, a SEM software, plus two extra parameters to model residual spatial correlation. The residuals showed substantial spatial correlation, which indicates that including spatial correlation yields more accurate predictions. We also compared the standard SEM and the spatial SEM approaches in terms of SEM model coefficients. Differences were substantial but none of the coefficients changed sign. Presence of residual spatial correlation suggests that some of the causal factors that explain soil variation were not captured by the set of covariates. Thus, it is worthwhile to search for additional covariates leaving only unstructured residual noise, but provided that this is not achieved, it is beneficial to include residual spatial correlation in mapping using SEM.
Instituto de Suelos
Fil: Angelini, Marcos Esteban. INTA. Instituto de Suelos; Argentina. Wageningen University. Soil Geography and Landscape group; Holanda . International Soil Reference and Information Centre. World Soil Information; Holanda.
Fil: Heuvelink, Gerard B.M. Soil Geography and Landscape group; Holanda . International Soil Reference and Information Centre. World Soil Information; Holanda.
Spatial statistics 25 : 35-51. (June 2018)
Propiedades Físico-Químicas Suelo
Soil Chemicophysical Properties
Spatial Correlation
Regression Kriging
Correlación Espacial
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Restricted access
INTA Digital (INTA)
Instituto Nacional de Tecnología Agropecuaria
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