Spatial variability of soil dehydrogenases and cellulases activities in a field scale

摘要

Spatial field-scale variability of soil dehydrogenases and cellulases activities and their relationship with organic carbon and total nitrogen content at the surface horizon of eutric, gleic Cambisols of the field, under winter wheat localised in the southern part of the Sepopolska Plain was assessed. Twenty soil samples were collected in September in the system defined by the method of diffused points localised by GPS. The activity of dehydrogenases ranged between 0.8-1.55 mu M TPF g(-1) DM 24 h(-1), while cellulolytic activity ranged between 0.2- 1.0 mu M glucose g(-1) DM h(-1) x 10(-3). A high nugget effect observed for both enzymatic activities was probably caused by a nest (local) occurrence of the enzymes, especially dehydrogenase. No statistically significant correlation coefficients were calculated for the relationship between the enzymatic activities and C-org, N-tot and clay fraction content.