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• W1647509899 abstract "espanolLa determinacion de la materia organica (MO) resulta fundamental para el conocimiento de la productividad agricola y forestal de los suelos. En este estudio se evaluo la relacion entre los contenidos de materia organica (MO) determinados por perdida por ignicion (MOPI ) y combustion humeda de Walkley-Black (MOCH) en suelos de la Region Andino Patagonica. La relacion se evaluo para suelos volcanicos con y sin aluminosilicatos amorfos y con distintos tipos de vegetacion: plantaciones de Pinus ponderosa, bosques de Austrocedrus chilensis, arbustales, estepa arbustiva y estepa herbacea. Se seleccionaron 100 sitios de muestreo, donde se tomaron muestras compuestas del horizonte A para la determinacion de MOCH y MOPI. Los datos fueron analizados mediante analisis de varianza y regresiones simples. MOCH fue siempre inferior a MOPI. Esto es esperable dado que MOPI incluye la MO total, mientras que MOCH discrimina las formas de carbono fuertemente condensadas. Si bien no se detectaron diferencias en la relacion entre los metodos analiticos para suelos con y sin aluminosilicatos amorfos, si existio una fuerte relacion entre la presencia de estos y los contenidos absolutos de MO. La relacion entre los metodos analiticos vario segun el tipo de vegetacion. Los suelos que sustentan vegetacion de estepa herbacea y plantacion de pino ponderosa presentaron las mayores diferencias entre los dos metodos analiticos. MOCH fue, en promedio, un 37% inferior a MOPI para estos tipos de vegetacion, siendo significativamente superior a lo hallado en arbustales (26%). Los suelos con bosque denso de Austrocedrus chilensis y estepa arbustiva presentaron valores intermedios (30 y 35%, respectivamente). Las plantaciones de pino ponderosa (primera rotacion, edad promedio 21 anos) fueron realizadas en areas de estepa herbacea. Las similitudes encontradas entre ambos suelos podrian estar asociadas a caracteristicas de la MO propias del ambiente y tipo de suelo de la estepa herbacea, que aun se mantienen por el escaso tiempo transcurrido desde la implantacion del bosque. Se generaron dos modelos de regresion lineal que evidencian la relacion entre MOCH y MOPI para distintos tipos de vegetacion: Plantacion de pino ponderosa y estepa herbacea MOPI (%) = 1,37 x MOCH (%) + 0,81 (R2 = 0,86; n = 40) Estepa arbustiva, arbustal, y bosque denso de cipres MOPI (%) = 1,19 x MOCH (%) + 1,58 (R2 = 0,93; n = 60) Las ecuaciones generadas permiten comparar datos de contenido de MO obtenidos por los distintos metodos analiticos. EnglishThe determination of organic matter (OM) content is key for the knowledge of agricultural and forestry soil productivity. This study evaluated the relationship between OM content determined by weight loss-on ignition (OMWLOI) and Walkley-Black wet oxidation method (OMWO) in soils of the Patagonian Andean Region. The relation was evaluated for volcanic soils with and without amorphous components and with different vegetation types: Pinus ponderosa plantations, herbaceous steppe, shrubly steppe, shrubs and Austrocedrus chilensis forests. One hundred sampling sites were selected and composed samples were obtained from horizon A. Data were analyzed by means of analysis of variance and simple regressions. OMWO was always lower than OMWLOI. This is expectable since OMWLOI includes the total OM, whereas MOWO discriminates the strongly condensed carbon forms. Although differences in the relationship between the analytical methods for soils with and without amorphous components were not detected, a great relationship between these components and organic matter content was found. The relationship between the analytical methods varied according to the vegetation type. Soils with herbaceous steppe and pine plantations presented the greatest differences between the analytical methods. OMWO was in average 37% lower than OMWLOI for these types of vegetation, being significantly greater than soils with srhubs (26%). Soils with Austrocedrus chilensis forests and shrubly steppe presented intermediate values (30% and 35% respectively). Pinus ponderosa plantations (first rotation, average age 21 years) were located in areas with herbaceous steppe. The similarities found between both soils could be associated to the characteristics of OM in the herbaceous steppe environment and soil type, which did not change because of the little time passed since the implantation. Two linear regression models were generated that show the relationship between OMWO and OMWLOI for different vegetation types: Pinus ponderosa plantation and herbaceous steppe OMWLOI (%) = 1.37 x OMWO (%) + 0.81 (R2 = 0.86; n = 40) Shrubs, shrubly steppe and Austrocedrus chilensis forest OMWLOI (%) = 1.19 x OMWO (%) + 1.58 (R2 = 0.93; n = 60) These equations allow the comparison of MO content data generated by different analytical methods." @default.
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• W1647509899 date "2007-12-01" @default.
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• W1647509899 title "Comparación de métodos analíticos para la determinación de materia orgánica en suelos de la región Andino-Patagónica: efectos de la vegetación y el tipo de suelo" @default.
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