Data/hora: 21/06/2024 00:21:03

Biblioteca(s): | Embrapa Semiárido.
Data corrente: | 05/09/2017
Data da última atualização: | 27/02/2018
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.
Título: | Carbon exchange in a Caatinga area during an unusually drought year.
Ano de publicação: | 2017
Fonte/Imprenta: | Agrometeoros, Passo Fundo, v. 25, n. 1, p. 37-45, ago. 2017.
Idioma: | Inglês
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.
Palavras-Chave: | Dry forest; Semiárido; Turbulent vortices covariance.
Thesagro: | Dióxido de carbono; Floresta; Resistência a Seca; Seca.
Thesaurus Nal: | Carbon dioxide.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/163425/1/Magna-1.pdf
Registro original: | Embrapa Semiárido (CPATSA)
Exemplares: | CPATSA - (56800-1) - UPC - AP - DD -  -  -  - DIS