Carbon dynamics and soil greenhouse fluxes in a Florida's native rangeland before and after fire

Grazing lands, including the native rangelands, cover an extensive area of southeastern United States, representing important component carbon balance for region. In Florida, rangelands extend over 3.1 Mha, experiencing a natural fire frequency between 2 – 5 years and strong climatic variability. Management includes prescribed mechanical brush control. This study is first its kind assessing impacts variability on C dynamics warming potential in Florida's rangeland. We used combination eddy covariance chamber measurements to estimate net ecosystem exchange (NEE), greenhouse gas (GHG, CO2, CH4, N2O) emissions, pre post-fire aboveground biomass. NEE extended four half since 2016, included event during fourth year (May 1st, 2019), two GHG . Pre-fire production (NEP) was -368 ± 41 g m?2 yr?1 decreased -181 year. After accounting -43 2019. Soil CO2 dominated emissions increasing 172 after fire, N2O fluxes increased from 29, pre-fire year, (CO2eqv) post-fire, CH4 sink -1.7 -3.9 CO2eqv. The effect uptake short-lived, recovered fast NEP reached monthly average months after, increases caused by were offset within next after. rangeland suitable mitigate global warming, it acted as offsetting -1148 drought