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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

View larger version (32K): [in this window] [in a new window]   Fig. 1. Representative near-infrared (NIR) spectra of soil samples heated at different temperatures (from Relleu site). (a) NIR spectra of samples heated during 40 min and the maximum temperature reached (MTR) (without preprocessing). (b) NIR spectra of samples heated during 10 min (after first derivative preprocessing). Black line: spectra of the unheated soil. Gray lines: spectra of heated soils. Dotted line: spectra of samples with highest MTR. (b) Arrows denote regions where the successive increase in MTR caused a progressive decrease in absorbance.

View larger version (24K): [in this window] [in a new window]   Fig. 2. Relationship between maximum temperature reached in soils measured with thermocouple and predicted by near-infrared spectroscopy in the validations of the local models. Stars denote outliers (not removed).

View larger version (16K): [in this window] [in a new window]   Fig. 3. Relationship between the maximum temperature reached in soils measured with thermocouple and predicted by near-infrared spectroscopy in the global model constructed through cross validation method (n = 310). Closed symbols denote outliers (not removed).

View larger version (15K): [in this window] [in a new window]   Fig. 4. Relationship between maximum temperature reached in soils measured with thermocouple and predicted by near-infrared spectroscopy in the global model constructed with the test set validation method. The calibration set (n = 155) is composed by the 50% of samples (randomly selected), and the validation set (n = 155) is composed by the other 50% of samples. Closed symbols denote outliers (not removed).