Estimating the mass wetness of Spanish arid soils from lightness measurements
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Sánchez Marañón, Manuel; Ortega Pérez, Raúl; Miralles Mellado, Isabel; Soriano Rodríguez, MiguelFecha
2007-08-09Resumen
The colour of a soil changes with its water content. This paper investigates the ability of spectrophotometric colour measurement to predict soil mass wetness (w). We looked at the CIELAB parameters (L⁎, C⁎ab, hab) and spectral profile of 76 A soil-horizons from south-eastern Spain to (i) group them by colour, (ii) calibrate within each group the relationships between water content and colour in disturbed and undisturbed samples, and (iii) test the validity of predictive models. Four groups of differently coloured soils were selected from the reflectance curves. Models constructed only with L⁎ (lightness) from the dryness state to the water content at − 33/− 10 kPa explained the greatest variation in w (R2 = 0.77–0.97), regardless of the soil colour or sample type. The decrease in soil lightness with increasing water content was noted mainly at − 1500 kPa, − 400/− 100 kPa, and − 33/− 10 kPa potentials. At intermediate potentials, however, L⁎ did not strongly correlate with w, especiall...
Palabra/s clave
Soil colour
Water retention
Regression model
Spectrophotometer