Assessment of biogeochemical trends in soil organic matter sequestration in Mediterranean calcimorphic mountain soils (Almería, Southern Spain)
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Miralles Mellado, Isabel; Ortega Pérez, Raúl; Sánchez Marañón, Manuel; Soriano Rodríguez, Miguel; AlmendrosFecha
2007-05-24Resumen
Total soil organic matter levels and humic acid formation processes in mountain calcimorphic soils from Sierra María-Los Vélez Natural Park (Almería, Southern Spain) were found to differ depending on soil use (pine and oak forests, and cleared areas either cultivated or affected by bush encroachment). Biogeochemical indicators such as the concentration of exchangeable cations, or the concentration of the different types of humic substances were neither influenced by the type of vegetation nor soil use. In fact, multidimensional scaling and multiple correlations suggest that soil carbon sequestration processes are controlled by small-scale topographical features and their impact on water holding capacity. From a qualitative viewpoint, there were two more or less defined sets of soils: one set consisted of soils with humic acids with marked aliphatic character, displayed intense 2920 cm−1 infrared band, and had low optical density. The resolution-enhanced infrared spectra suggested typic...
Palabra/s clave
Humic acid
Humic substances
Humus fractions
Humification pathways
Fungal melanins
Perylenequinones
Lignin alteration
Visible spectroscopy
Infrared spectroscopy