[Microbial activity in soil fractions with different size particles - in Mediterranean area [Campania]]
2003
Pellegrino, A. | Papa, S. | Fioretto, A. (Seconda Universita degli Studi di Napoli, Caserta (Italy). Dipartimento di Scienze della Vita)
In order to study enzyme locations into the soil structure and the relationship between soil enzymes and organic matter, some enzyme activities (xylanase, cellulase, invertase, protease, trealase and alkaline phosphatase), organic carbon, total nitrogen and C/N ratio were assayed in the soil fractions, obtained using a low energy sonication. This study was carried out in two oak woods: Parco di Riforestazione Tirone Alto Vesuvio, Naples, and Oasi WWF Bosco di S. Silvestro, Caserta. In the Vesuvius soil the highest activities were found in the clay and silt fractions, that had also the highest C sub (org) and N sub (tot) content. Only invertase activity showed high values in the coarse sand and clay fractions. In the Bosco di S. Silvestro soil, instead, enzyme activities were higher in sand fractions, while phosphatase activity was distributed homogeneously into the fractions. The highest C sub (org) and N sub (tot) contents and the highest C/N ratio were in the sand fractions of both soils. The results show that the two studied soils differed for their enzyme activities and, in particular, for their location. The highest enzyme activity in the fine fractions of the Vesuvius soil, with a low C/N ratio, suggests a strong relationship with microbial biomass. On the contrary, the presence of the highest enzyme activities in the sand fractions, with a higher C/N ratio, suggests that in the Bosco di S. Silvestro soil these are linked to the fungal activity and leaf litter decomposition
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