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SOIL FLUXES OF CO 2 , CO, NO, AND N 2 O FROM AN OLD PASTURE AND FROM NATIVE SAVANNA IN BRAZIL
Author(s) -
Varella R. F.,
Bustamante M. M. C.,
Pinto A. S.,
Kisselle K. W.,
Santos R. V.,
Burke R. A.,
Zepp R. G.,
Viana L. T.
Publication year - 2004
Publication title -
ecological applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.864
H-Index - 213
eISSN - 1939-5582
pISSN - 1051-0761
DOI - 10.1890/01-6014
Subject(s) - pasture , dry season , brachiaria , biomass (ecology) , wet season , environmental science , seasonality , agronomy , soil water , growing season , grazing , ecology , biology , forage , soil science
We compared fluxes of CO 2 , CO, NO, and N 2 O, soil microbial biomass, and N availability in a 20‐yr‐old Brachiaria pasture and a native cerrado area (savanna in central Brazil). Availability of N and NO fluxes were lower in the pasture than in the cerrado. N 2 O fluxes were below detection limit at both sites. The CO fluxes showed weak seasonal variation with slightly higher positive fluxes in the dry season and lower fluxes, including net consumption, during the wet season. The cerrado CO fluxes were higher and more variable than the fluxes in the pasture. Both sites showed a seasonal pattern in CO 2 emissions with lower fluxes (∼2 μmol CO 2 ·m −2 ·s −1 ) during the dry season. There were no significant differences in annual CO 2 soil emissions between the cerrado and the pasture, but the temporal trends differed, with higher fluxes in the pasture during the transition from the wet to the dry season. Artificial water addition in the pasture during the dry season resulted in short‐lived pulses of NO and CO 2 .