N2O emission from tropical forest soils of Australia

摘要: Three different tropical rain forest sites (Kauri Creek, Lake Eacham, and Massey Creek) on the Atherton Tablelands, Queensland, Australia, were investigated for magnitude of N 2 O emission from soils during seasons, that is, wet season, dry transition periods. Highest mean rates observed derived granite at Kauri Creek site with 74.5 ± 25.2 μg O-N m -2 h -1 , whereas Metamorphics (Lake Eacham site) much lower (13.1 1.1 ). For site, Rhyolite, a annual rate 46.2 was calculated. The calculated all three over entire observation period 39.0 thus high end reports soils. showed pronounced temporal as well spatial variability. emissions strongly linked to rainfall events; increased approximately 6-8 hours after precipitation. Correlation analysis confirmed strong dependency changes in soil moisture, temperature did not mediate considerable fluxes. Spatial variability fluxes scale could be explained best by differences water-filled pore space, CO emission, C/N ratio soil. On basis published flux we recalculated contribution such forests global atmospheric budget come up figure 3.55 Tg yr which is 50% higher than reported others.