Soil enzymatic response to addition of heavy metals with organic residues

摘要: Changes in organic C, available P, heavy metal contents and enzymatic activities induced by addition of two rich residues [a municipal solid waste compost (MWC) a non-composted paper sludge (PS)] were determined different soils during 280-day incubation experiment. The the materials caused rapid significant increase C both soils, this was specially noticeable treated with MWC. In general, amended tended to decrease time. Organic also increased soil. However, presence soil metals due at doses 50,000 kg ha–1 did not negatively affect dehydrogenase, β-glucosidase or urease soils. There negative correlations between phosphatase activity beginning incubation. This correlation probably enzyme PS which high levels P found. It is difficult, therefore, attribute an inhibition these because concentration depresses activity.