Production of N2O,CH4, and CO2 from soils in the tropical savanna during the dry season |
| |
| Authors: | W M Hao D Scharffe P J Crutzen E Sanhueza |
| |
| Institution: | (1) Max Planck Institute for Chemistry, P.O. Box 3060, D-6500 Mainz, Federal Republic of Germany;(2) Instituto Venezolano de Investigaciones Cientificas (IVIC), Apartado 21827, 1020A Caracas, Venezuela |
| |
| Abstract: | Emissions of N2O, CH4, and CO2 from soils at two sites in the tropical savanna of central Venezuela were determined during the dry season in February 1987. Measured arithmetic mean fluxes of N2O, CH4, and CO2 from undisturbed soil plots to the atmosphere were 2.5×109, 4.3×1010, and 3.0×1013 molecules cm-2 s-1, respectively. These fluxes were not significantly affected by burning the grass layer. Emissions of N2O increased fourfold after simulated rainfall, suggesting that production of N2O in savanna soils during the rainy season may be an important source for atmospheric N2O. The CH4 flux measurements indicate that these savanna soils were not a sink, but a small source, for atmospheric methane. Fluxes of CO2 from savanna soils increased ninefold two hours after simulated rainfall, and remained three times higher than normal after 16 hours. More research is needed to clarify the significance of savannas in the global cycles of N2O, CH4, CO2, and other trace gases, especially during the rainy season. |
| |
| Keywords: | N2O emission CH4 emission CO2 emission tropical savanna soil atmospheric budget |
| 本文献已被 SpringerLink 等数据库收录！ |
|
