CO2, N2O and NH3 emissions from two different type of soils as affected by applications of dairy sewage sludge.

摘要

A pot experiment with the dairy sewage sludge (DSS) was conducted under aerobic condition (60% WHC, water holding capacity) for a period of 240 days. The emissions of carbon dioxide (CO< sub>2), nitrous oxide (N< sub>2O) and ammonia (NH< sub>3) were determined in grey-brown podzolic and brown soils. Both soils were amended by different doses of DSS (0, 30, 60, 80, 120, 200, 300 and 600 t ha-1). In general, the amendment of DSS stimulated CO< sub>2 and N< sub>2O emissions from both soils. This effect increased after the incorporation of high doses of DSS. It was confirmed by significant positive correlations between the doses of DSS and CO< sub>2 and N< sub>2O fluxes. This study showed that DSS application had no significant influence on the emission of NH< sub>3. In both soils the NH< sub>3 emission was noted only once during the incubation period and only in the treatments with the highest doses of DSS. The long-term addition of DSS on this parameters needs further examination.