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Carbon fractions and enzymatic activities in two cultivated dryland soils under conservation tillage

AuthorsMelero Sánchez, Sebastiana ; López Garrido, Rosa ; Madejón, Engracia ; Murillo Carpio, José Manuel ; Vanderlinden, Karl; Ordóñez, Rafaela; Moreno Lucas, Félix
Issue Date2010
PublisherSoil Foodweb Institute
AbstractLong-term soil management experiments are expected to provide important information regarding sustainable crop production systems. In this study we evaluated the long-term effect of conservation tillage (CT) on biological properties in two different textured soils [Entisol (soil A) and Vertisol (soil B)].The results were compared with those obtained under traditional tillage (TT). Soil labile carbon fraction was measured by the determination of active carbon (AC) and water soluble carbon (WSC). Biological status was evaluated by the measurement of soil microbial biomass carbon (MBC) and enzymatic activities [dehydrogenase activity (DHA) and ß-glucosidase activity (ß-glu)].Contents of AC, MBC, and ß-glu in soil A and contents of DHA in soil B were higher in CT than in TT, at 0-5 cm depth. Discriminant analysis (DA) showed that the discriminant function was strongly correlated with MBC and AC in soil A and with TOC, AC and WSC in soil B. According to this study, AC content was the most sensible and reliable indicator for assessing the impact of different soil management strategies on soil quality in the two soils. Long-term dryland soil conservation management improved the quality of both soil types (Entisol and Vertisol), especially near the surface, by enhancing its biological status.
Appears in Collections:(IRNAS) Comunicaciones congresos
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