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Litter Decomposition of Acacia caven (Molina) Molina and Lolium multiflorum Lam. in Mediterranean Climate Ecosystems Chilean J. Agric. Res.
Martínez G,Ingrid; Zagal V,Erick; Ovalle M,Carlos; Coûteaux,Marie-Madeleine; Stolpe,Neal B; Valderrama V,Natalia.
The ecosystems of the Mediterranean interior dryland of Chile, dominated by an espinal agroecosystem of Acacia caven (Molina) Molina, show low productivity as a result of soil degradation. The objective of this study was to evaluate litter decomposition of A. caven and Lolium multiflorum Lam. in espinal ecosystems: well preserved (Wp) 50 to 80%, typical (Pd) 25 to 50%, and degraded (De) with 10 to 25% cover. During 420 d and starting in April 2004 until August 2005, weight loss in litter bags and chemical composition (hemicellulose, cellulose, lignin, non-structural components, ash, N, C, C/N ratio, and P) were determined by using near infrared reflectance spectroscopy (NIRS) and the Van Soest protocol. Weight loss ranged from 31 to 52% in L. multiflorum...
Tipo: Journal article Palavras-chave: Canopy cover; Weight loss; Litter bags; NIRS; Principal components.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000300013
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Dissolved Organic Carbon and Nitrogen in Andisol for Six Crop Rotations with Different Soil Management Intensity Chilean J. Agric. Res.
Undurraga D,Pablo; Zagal V,Erick; Sepúlveda W,Gloria; Valderrama V,Natalia.
Soil organic matter (OM) content is a quality indicator, but is an inadequate indicator in the short-term because these changes take place slowly, so dissolved organic components have emerged as an alternative. In volcanic soil subjected to different crop rotations with distinct land use intensity, dissolved organic C and N (DOC and DON) were determined as well as their relationship with total C and N contents in the soil, considering the effects of crop rotation, fertilization level, and soil depth. In humid samples of Humic Haploxerands collected at four depths up to 40 cm, DOC and DON contents were determined by extraction with K2SO4 and filtered. Results indicated interaction between the studied factors, DOC fluctuated between 67.8 and 151.7 mg kg-1...
Tipo: Journal article Palavras-chave: Organic matter; Dissolved organic matter; Total C; Total N; Volcanic soil.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000300018
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PARÁMETROS HIDRÁULICOS DETERMINADOS EN UN ANDISOL BAJO DIFERENTES ROTACIONES CULTURALES DESPUÉS DE DIEZ AÑOS R.C. Suelo Nutr. Veg.
Sandoval E,Marco; Castillo S,Carolina; Zagal V,Erick; Stolpe L,Neal; Undurraga D,Pablo.
Los parámetros Hidráulicos fueron medidos en un suelo de origen volcánico del Valle Central (Humic Haploxerands) bajo diferentes rotaciones culturales con distinto manejo agronómico e intensidad de uso del suelo y fueron agrupadas en cuatro rotaciones que incluyeron pradera y dos rotaciones intensivas, sin pradera. Las mediciones de conductividad Hidráulica saturada (Kfs) fueron realizadas in-situ. Se determinaron, además, dos parámetros Hidráulicos del suelo: El parámetro á y el potencial de flujo mátrico (Φm). Todas las parcelas con pradera, dentro de la rotación tuvieron valores similares de Kfs. Las parcelas con rotaciones intensivas presentaron valores extremos el mayor y menor valor de Kfs, donde la rotación: remolacha-trigo-frejol-cebada,...
Tipo: Journal article Palavras-chave: Conductividad Hidráulica; Parámetro a; Potencial de flujo mátrico.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912007000200004
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