Título:	Carbon exchange in a Caatinga area during an unusually drought year.
Autoria:	SOUZA, L. S. B. de MOURA, M. S. B. de SEDIYAMA, G. C. SILVA, T. G. F. da
Afiliação:	LUCIANA SANDRA BASTOS DE SOUZA, Universidade Federal Rural de Pernambuco, Unidade Acadêmica de Serra Talhada, PE; MAGNA SOELMA BESERRA DE MOURA, CPATSA; GILBERTO CHOHAKU SEDIYAMA, UFV; THIERES GEORGE FREIRE DA SILVA, Universidade Federal Rural de Pernambuco, Unidade Acadêmica de Serra Talhada, PE.
Ano de publicação:	2017
Referência:	Agrometeoros, Passo Fundo, v. 25, n. 1, p. 37-45, ago. 2017.
Conteúdo:	The 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.
Thesagro:	Seca Dióxido de carbono Floresta Resistência a Seca
NAL Thesaurus:	Carbon dioxide
Palavras-chave:	Semiárido Dry forest Turbulent vortices covariance
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPATSA)