Maximum leaf photosynthetic light response for three species in a transitional tropical forest in Southern Amazonia

Miranda, Eduardo Jacusiel; Filho, Nicolau Priante; Priante, Pedro Correto; Campelo, José Holanda; Suli, George Sanches; Fritzen, Clóvis L.; Nogueira, José de Souza; Vourlitis, George L.

doi:10.1590/s1415-43662004000100024

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…A área de estudo é caracterizada por clima tropical úmido, com duas estações definidas, uma estação seca de junho a agosto, e uma estação chuvosa de dezembro a fevereiro, com uma temperatura média anual de 24°C e precipitação de 2000 mm/ano. Miranda et al (2004). O solo foi caracterizado como Neossolo Quartizarênio Órtico típico a moderado álico.…”

Section: Methodsunclassified

Dinâmica da temperatura do ar de uma floresta de transição do norte de Mato Grosso

Ferreira¹,

Paulo²,

Paulo³

2017

Nativa

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RESUMO: A pesquisa foi realizada utilizando dados coletados em uma floresta de transição entre cerrado e floresta tropical úmida no norte de Mato Grosso. Os dados utilizados foram coletados no período de 2003. O foco central dessa pesquisa é a dinâmica da temperatura do ar nesse ecossistema. Pode-se concluir que essa investigação foi capaz de fornecer informações importantes da variável microclimatológica estudada. Os atratores reconstruídos a partir da série temporal do mês que corresponde ao período seco se apresentam como um ciclo mais bem comportado, quando comparada ao mês correspondente ao período intermediário chuvoso e seco. Observou-se um ciclo de linha fechada utilizando dados a cada meia hora, organizados mês a mês. A temperatura média horária possui um comportamento bastante regular. Encontrou-se um valor próximo de 1 para o coeficiente de dispersão medido pelo valor do  2 reduzido, em alguns meses, tomando-se a diferença relativa entre os dados experimentais e os valores médios horários, indicando que os valore médios bem representam os dados experimentais para os meses de estação seca. Palavras-chave: Temperatura ambiente, atratores reconstruídos, defasagem, massa de ar, séries temporais. Dynamics of the air temperature of a transition forest in the north of Mato Grosso ABSTRACT: This research was done by using data collected in a transition forest located between Brazilian savannah and tropical Amazon forest in the north of Mato Grosso, Brazil. The used data were collected in the year of 2003.The main focus of this research is the dynamics of air temperature in such a ecossystem. It was concluded that this investigation was able to give important information concerning the studied microclimatological variable. The attractors reconstructed from the time series of the month that corresponds to the dry season, presented a well behaved cycle, compared with the corresponding month in the period between the rainy and dry seasons. It was observed a closed cycle by using half hour data organized monthly. The mean hourly temperature has a regular behaviour. The dispersion coefficient (measured by the reduced  2) between the experimental data and the mean hourly values, in some months, was near 1, indicating that the mean values well represent the experimental data for the dry season.

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Section: Methodsunclassified

Dinâmica da temperatura do ar de uma floresta de transição do norte de Mato Grosso

Ferreira¹,

Paulo²,

Paulo³

2017

Nativa

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Seasonal, diurnal and vertical variation in photosynthetic parameters in Phyllostachys humilis bamboo plants

et al. 2014

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In recent years, temperate bamboo species have been introduced in Europe for multiple uses such as renewable bio-based materials (wood, composites, fibres, biochemicals…) and numerous ecological functions (soil and water conservation, erosion control, phytoremediation…). Despite their interesting potential, little is known on the ecophysiology of these plants in their new habitat. Therefore, we studied gas exchange parameters on a full soil bamboo plantation of Phyllostachys humilis on a test field in Ireland (Europe). We evaluated the seasonal, diurnal and vertical variation of the parameters of two commonly used photosynthetic models, i.e. the light response curve (LRC) model and the model of Farquhar, von Caemmerer and Berry (FvCB). Furthermore, we tested if there were environmental effects on the photosynthetic parameters of these models and if a correlation between photosynthetic parameters and fluorescence parameters was present, fluorescence parameters can be easily and fast determined. Our results show that the gas exchange parameters do not vary diurnally or vertically. Only seasonal variations were found and should, therefore, be taken into account when using the LRC or FvCB model when modelling canopy growth. Therefore, a big-leaf model or a sunlit-shade model can be used for modelling bamboo growth in Western Europe. There is no straightforward relation between environmental variables and the photosynthetic parameters. Although fluorescence parameters showed a correlation with the photosynthetic parameters, application of such correlation may be limited.

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The Sensitivity of Diel CO2 and H2O Vapor Exchange of a Tropical Transitional Forest to Seasonal Variation in Meteorology and Water Availability

et al. 2005

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Measurements of ecosystem gas exchange, meteorology, and hydrology (rainfall and soil moisture) were used to assess the seasonal patterns of, and controls on, average diel (24 h) net ecosystem CO2 exchange (NEE), evapotranspiration (E), and bulk canopy water vapor conductance (Gc) of a tropical transitional (ecotonal) forest in the Brazilian Amazon. Diel trends in E and NEE were almost completely explained by the diel variation in photosynthetic photon flux density (QPPFD), and while the QPPFD response of E varied little over the annual cycle, the QPPFD response of NEE declined substantially during the dry season, and the magnitude of hysteresis in the NEE–QPPFD response increased as well. The magnitude of the residuals for the QPPFD versus NEE response was significantly negatively correlated with total monthly rainfall and surface soil moisture and positively correlated with the maximum daily temperature and atmospheric vapor pressure deficit (V). Average daily Gc was also significantly correlated with average daily V (r = −0.72) and soil moisture (r = 0.62), suggesting strong stomatal control of NEE during drought. However, drought reduced ecosystem CO2 efflux relatively more than CO2 assimilation, suggesting that the seasonal variation in NEE was largely driven by seasonal variation in respiration. When compared with other tropical forests, seasonality in NEE was negatively correlated with annual rainfall and positively correlated with dry-season length. The relatively high sensitivity of NEE to seasonal variation in climate and water availability has profound implications for C cycling dynamics under novel climates resulting from climate and/or land-use change in the Amazon basin.

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Maximum leaf photosynthetic light response for three species in a transitional tropical forest in Southern Amazonia

Cited by 3 publications

References 8 publications

Dinâmica da temperatura do ar de uma floresta de transição do norte de Mato Grosso

Dinâmica da temperatura do ar de uma floresta de transição do norte de Mato Grosso

Seasonal, diurnal and vertical variation in photosynthetic parameters in Phyllostachys humilis bamboo plants

The Sensitivity of Diel CO2 and H2O Vapor Exchange of a Tropical Transitional Forest to Seasonal Variation in Meteorology and Water Availability

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