01803naa a2200253 a 450000100080000000500110000800800410001910000230006024500960008326000090017952010770018865000190126565000240128465000130130865000240132165000090134565300150135465300150136965300340138470000230141870000200144170000230146177300650148420750242018-02-27       2017    bl uuuu     u00u1 u    #d1 aSOUZA, L. S. B. de  aCarbon exchange in a Caatinga area during an unusually drought year.h[electronic resource]  c2017  aThe objective of this study was to analyze the daily and seasonal variation of the carbon balance components in a caatinga area during an unusually drought year. Data were collected from a turbulent vortices covariance system installed at an area in Caatinga, in the region of Petrolina Municipality, State of Pernambuco, Brazil. Carbon dioxide flux data were collected in the year 2012, and the partitioning between gross primary productivity (GPP) and ecosystem respiration (Re). The vegetation cover index, weather elements and the soil water content were monitored. It was observed that the daily emissions of CO2 flux was dependent upon photosynthetically active radiation in the first days after rainfall events, being influenced by the water vapor pressure deficit with the reduction in the soil water content. The occurrence of up to 2 mm rainfall promoted peaks of Re after long periods of drought. The measured NEP was equal to 468.18 gC m-2 year-1. So, it is concluded that in years with severe drought, Caatinga may act as a source of carbon to the atmosphere.  aCarbon dioxide  aDióxido de carbono  aFloresta  aResistência a Seca  aSeca  aDry forest  aSemiárido  aTurbulent vortices covariance1 aMOURA, M. S. B. de1 aSEDIYAMA, G. C.1 aSILVA, T. G. F. da  tAgrometeoros, Passo Fundogv. 25, n. 1, p. 37-45, ago. 2017.