Phosphorus fractions and phosphatase activity in an Andisol under different forest ecosystems

Actividad biológica del suelo de bosque templado en un transecto altitudinal, Parque Nacional Conguillío (38º S), Chile

“…En ñirre y araucaria-lenga los rangos de la β-glucosidasa son similares entre sí, aunque disminuyen un tercio respecto a raulí-coihue, lo que muestra una influencia clara a los cambios en la vegetación (Bastida et al 2008) y a las condiciones climáticas presentes. A diferencia de Roose-Amsaleg et al (2005) y Críquet et al (2007, los altos niveles de fósforo disponible no necesariamente implica una retroinhibición sobre la actividad fosfatasa ácida, corroborado en este estudio por la correlación positiva entre ambas variables (cuadro 4), ya que al existir una mayor porción de fósforo orgánico lábil proveniente de la hojarasca en este tipo de bosques, aumenta la actividad de esta enzima, como lo señala Redel et al (2008). El alto nivel de fosfatasa ácida en raulí-coihue pudo deberse a la estabilidad de la enzima por adsorción en la materia orgánica y el alto contenido de nitrógeno en el suelo (NBM) (Cárcamo et al 2004), todas estas variables se relacionan entre sí, incidiendo positivamente en el factor 1 del análisis factorial (cuadro 5).…”

Assessment of phosphorus status influenced by Al and Fe compounds in volcanic grassland soils

“…This P o is mainly present as inositol penta-and hexaphosphates that comprises between 30-82% of total P (P T ) in topsoils (Borie and Barea, 1985;Redel et al, 2007;2008;. Specifically, P retention is due to the adsorption by minerals like allophane, imogolite and Fe-or Al-oxides associated with humic substances and Al present in the interlayers of expandable phyllosilicates (Gunjigake and Wada, 1980;Vistoso et al, 2012).…”

“…In volcanic soils Broquen et al (2005) and Satti et al (2007) investigated acidification processes in a forest Andisol climatic sequence; they found that in drier climates a less strong Al and P retention occurred. In Chilean Andisols, there are several reports on P fractionation; some of them include 31 P-NMR analysis (Borie and Zunino, 1983;Borie et al, 2002;Redel et al, 2007;2008;Velásquez et al, 2016a, b) and pyrophosphate/ oxalate Al and Fe determinations (Mora and Canales, 1995;Matus et al, 2006;Panichini et al, 2012). However, simultaneous determinations of these parameters in the same extract are still lacking.…”

Responses of soil phosphorus fractions to gap size in a reforested spruce forest

“…The P availability to microorganisms and plants largely depends on soil P fractions; thus, the knowledge of different soil P fractions is essential to assess P bioavailability in soil (McDowell and Stewart, 2006). There has been an increased interest in studying soil P fractions in terms of labile, intermediate, and resistant forms in inorganic (P i ) and organic P (P o ) fractions (Redel et al, 2008).…”