Data/hora: 03/06/2024 06:11:04

Biblioteca(s): | Embrapa Mandioca e Fruticultura; Embrapa Semiárido.
Data corrente: | 20/02/2005
Data da última atualização: | 10/06/2022
Autoria: | LIMA FILHO, J. M. P.
Afiliação: | JOSÉ MOACIR PINHEIRO LIMA FILHO, CPATSA.
Título: | Gas exchange of the umbu tree under semi-arid conditions.
Ano de publicação: | 2004
Fonte/Imprenta: | Revista Brasileira de Fruticultura, Jaboticabal, v. 26, n. 2, p. 206-208, ago. 2004.
Idioma: | Inglês
Conteúdo: | A study was carried out at Embrapa Semi-Árido, Petrolina-PE, Brazil, aiming to understand the gas exchange process of the umbu tree (Spondias tuberosa Arr. Cam) in the dry and rainy seasons. Stomatal conductance, transpiration, photosynthesis and internal CO2 concentration were obtained with a portable infrared gas analyzer (IRGA). During the dry season the umbu tree showed a much lower stomatal conductance early in the morning, as soon as the vapor pressure deficit increased, apparently affecting CO2 assimilation more than transpiration. The highest values were detected around 6: 00 am but decreased to the lowest points between 10:00 am and 2:00 pm. During the raing season, however, stomatal conductance, transpiration and photosynhesis were significantly higher, reaching the highest values between 8:00 and 10:00 am and the lowest around 2:00 pm. It was also observed at 4:00 pm, mainly during the rainy season, an increase on these variables indicating that the umbu tree exhibits a two-picked daily course of gas exchange.
Palavras-Chave: | CO2; Concentração interna de CO2; Condutividade estomática; internal concentration; Transpiração; Umbuzeiro.
Thesagro: | Fotossíntese; Spondias Tuberosa; Umbu.
Thesaurus Nal: | photosynthesis; stomatal conductance; transpiration.

Categoria do assunto:

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A Sistemas de Cultivo

URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/37296/1/Moacir.pdf
Registro original: | Embrapa Semiárido (CPATSA)

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