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)
K. P. Raven / Anales Cientícos 79 (2): 420 - 430 (2018)
423
La suma de las concentraciones de elementos extractables
de los suelos estudiados presentó un valor promedio
igual a 5,85 cmol kg
-1
y un coeciente de variabilidad de
113 %. Aunque esta no se expresó en términos de carga
eléctrica, constituye una manera alternativa para denir
la capacidad de intercambio catiónico efectiva para una
muestra de suelo. No se encontraron valores comparables
en la literatura revisada.
Las fracciones molar es extractables promedio
de elementos en las muestras de suelos ácidos del
Perú disminuyeron en el orden: Al > Ca > K > Mg >
Na > H > Mn > Fe > Zn > Cu. En conjunto, Al y Ca
constituyeron 70 % de la concentración total media de
elementos extractables. Esto es coherente con reportes
encontrados en la literatura, tales como Lu et al. (2014),
Shi et al. (2016) y Shuman y Duncan (1990). Al añadir K
y Mg, esta proporción se incrementó hasta casi 90 %. Los
coecientes de variabilidad para los elementos estudiados
fueron altos, aunque menores que para los resultados de
concentraciones extractables. La mitad de los elementos
evaluados presentaron valores entre 73 y 91 %, pero el
Cu alcanzó 808 %. Esta variabilidad es superior a aquella
reportada por Deressa et al. (2013) para Ca, K y Mg.
Sin embargo, las muestras estudiadas provienen de muy
diversas zonas del Perú.
Distribución de los datos en función del
pH
Las concentraciones de sustancias
extractables en las muestras de suelos
ácidos y sus fracciones molares
presentaron mejor correlación con el pH
que con los contenidos de materia orgánica
y arcilla, como se ilustra en la Tabla 3.
Por ello, la diversidad de los datos de este
estudio se presentó en función del pH.
Cabe notar, que se utilizó el valor límite
de 0,5 dS m
-1
para diferenciar muestras de
baja y alta conductividad eléctrica.
La acidez extractable de las muestras
estudiadas en función del pH se muestra
en la Figura 1. Los valores más pequeños
de acidez extractable fueron observados
en el rango de pH de 5 a 6. A medida que
disminuyó el pH, la acidez extractable
aumentó en magnitud y amplitud. Ambos
parámetros tuvieron una correlación
lineal signicativa, como indicado en la
Tabla 3. La alta correlación fue esperada,
ya que un menor pH está asociado con un
medio mas ácido. Esta tendencia ha sido
reportada en investigaciones, tales como
la de Deressa et al. (2013).
La relación entre la suma de las
concentraciones de elementos extractables
para las muestras de suelos ácidos del
Perú en relación con el pH también se
muestra en la Figura 1. En términos
globales, estos parámetros no estuvieron
correlacionados signicativamente,
como puede observarse en la Tabla 3. Sin
embargo, para el grupo de muestras de
baja conductividad eléctrica, esta relación
presentó un coeciente de correlación
lineal simple de +0,34, que resultó
signicativo. Para las muestras de alta
conductividad eléctrica, este coeciente
tuvo un valor igual a -0,22 y no alcanzó
signicación estadística.
Tabla 2. Valores reportados de acidez extractable (cmol H
+
kg
-1
) y
concentraciones de elementos intercambiables (cmol kg
-1
) para suelos
ácidos del mundo
Sustancia Rango Referencias Bibliográcas*
Acidez
Extractable
0,08 - 11 4, 12, 18
Al < 0,003 - 14 1, 2, 4, 6, 7, 8, 11, 14, 16, 17, 18
Ca < 0,005 - 17 1, 2, 3, 5, 6, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18
Cu 0,002 - 0,092 7, 10, 16, 19
Fe < 0,01 - 0,53 2, 6, 8, 16
H 0,08 - 20 8, 11, 14, 17
K 0,01 - 3,8 1, 2, 3, 5, 6, 8, 9, 11, 12, 13, 14, 15, 18
Mg 0,01 - 8,6 1, 2, 3, 5, 6, 8, 9, 11, 12, 13, 14, 16, 18
Mn 0,07 - 0,35 2, 6, 7, 16, 19
Na 0,03 - 3,4 1, 2, 6, 8, 11, 15, 16
Zn 0,0003 - 0,072 7, 10, 16, 19
* 1: James et al. (2016); 2: Shi et al. (2016); 3: Behera y Shukla (2015); 4: Hengl et al.
(2015); 5: Kim et al. (2015); 6: Alling et al. (2014); 7: Arenas-Lago et al. (2014); 8: Lu et
al. (2014); 9: Pérez-Esteban et al. (2014a); 10: Pérez-Esteban et al. (2014b); 11: Asensio
et al. (2013); 12: Deressa et al. (2013); 13: Tomasic et al. (2013); 14: Van der Heijden et
al. (2013); 15: Yitbarek et al. (2013); 16: Stevens et al. (2009); 17: Ross et al. (1996); 18:
Tabla 3. Coecientes de correlación lineal simple de contenido de
materia orgánica (MO, %), contenido de arcilla (%) y pH 1:1 en agua
con acidez extractable (cmol H
+
kg
-1
) y las concentraciones (cmol kg
-1
)
y fracciones molares (mol mol
-1
) de elementos extractables en muestras
de suelos ácidos del Perú
Sustancia
Cantidad Extractable Fracción Molar Extractable
MO Arcilla pH MO Arcilla pH
Acidez
Extractable
-0,02 -0,05 -0,53* - - -
Al -0,07 0,03 -0,35* -0,23* 0,00 -0,42*
Ca 0,13 0,19 0,16 0,18 0,13 0,50*
Cu 0,15 -0,12 -0,31* 0,15 -0,16 -0,28*
Fe -0,03 -0,11 -0,36* 0,00 -0,12 -0,39*
H 0,35* -0,17 -0,67* 0,13 -0,22* -0,64*
K 0,34* 0,07 0,10 0,08 -0,20 -0,02
Mg 0,06 0,19 0,24* 0,02 0,03 0,32*
Mn 0,16 -0,04 0,02 -0,03 -0,21* 0,15
Na 0,12 0,24* 0,23* -0,14 -0,06 0,09
Zn 0,27* -0,14 -0,36* 0,30* -0,15 -0,37*
Suma Elementos 0,16 0,17 -0,04 - - -
Nota: Valores marcados con * son estadísticamente diferentes a 0,00 para un nivel de
signicación igual a 0,05.