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Near-Infrared Spectroscopy to Estimate the Maximum Temperatures Reached on Burned Soils

GEA (Grupo de Edafología Ambiental), Dep. de Agroquímica y Medio Ambiente, Universidad Miguel Hernández. Avda. de la, Universidad s/n, E-03202 Elche, Spain

^* Corresponding author (cesar.guerrero{at}umh.es).

We studied the use of near-infrared (NIR) reflectance spectroscopy as a potential method to estimate a posteriori the maximum temperatures reached (MTR) on burned soils. When soils are heated, the NIR spectra change in accordance with the MTR. Thus, after calibrating, these patterns of NIR could be used as a fingerprint to estimate the MTR in burned soils. Successful validations of the models relating NIR spectra with MTR were obtained in each of the five soils studied (local models), with r² values ranging from 97.47 to 98.56%. A global model constructed with samples from the five soils studied obtained a similar accuracy, suggesting the presence in soils of some NIR-detectable compounds with similar thermal sensitivity. The influence of the variability caused by the soil type and the duration of heating during model constructions is also evaluated and discussed. The use of NIR presents interesting advantages, such as low cost, low time consumption, minimal pretreatment of samples, no need for chemicals, and accuracy. The results indicate that the MTR could be estimated in burned soils with NIR, offering a new perspective on studies of wildfire effects on soils.

Abbreviations: MIR, mid-infrared • MTR, maximum temperature reached • NIR, near-infrared • PLS, partial least squares • RMSECV, root mean square error of cross validation • RMSEE, root mean square error of the estimation • RPD, residual predictive deviation