Método de Granier e transpiração do mogno africano
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2016-04-04
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Universidade Federal de Goiás
Resumo
The African Mahogany’s commercial exploitation in the Brazilian Midwest
lacks information to assist management strategies of the specie and natural resources,
specially water. The transpiration and growth analysis are useful, not just for water
management, but also to support physiological studies. The Granier method (thermal
dissipation probe – TDP) uses sap flow measurements to estimate transpiration in woody
species, however it requires validate for each new specie. This paper aimed to study the
African Mahogany’s water consumption and growth in the Cerrado bioma. The main
activities aimed to: a) Adjust the Granier’s sap flux method to African Mahogany; b)
Quantify water consumption and vegetative growth on a 2.5 years old African Mahogany’s
forest, under two water regimes; c) Establish relations between tree transpiration and
atmospheric water demand. This research consisted of two experiments. The first one,
happened in oct-nov/2014 and feb-may/2015, consisted of the Granier’s model adjustment
with aid of the lysimetry, for use in African Mahogany’s transpiration measurements. The
second experiment, happened between oct/2014 and oct/2015, on a commercial forest up to
2.5 years old, evaluated water consumption (transpiration by leaf area – T) using integrated
sap flux measurements by TDP, and vegetative growth [leaf area (AF), diameter at breast
height (DAP), tree height (Alt), trunk volume (VTR) and leaf dry biomass (BMF)],
treatments were defined as: T1 – forest with irrigation interrupted at two years old; T2 –
forest without irrigation. The adjusted sap flux model to African mahogany is
F k AS 6 1,231 268,25 10 , and the original Granier’s model underestimates the
transpiration in 39.1%. The average potential transpiration was between 2.1 and 34.8 L
day-1. In field conditions, the growth benefits from the T1 are seen in highest values for
AF, DAP and BMF. However, the Alt and VTR are not significant different. The monthly T
under field conditions varied between 10.2 and 24.2 L m-2, except for jul-aug/2015, when
T2 transpiration was higher. The combination of bigger leaf area and low soil water
content led to T1’s water deficit scenario.
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SÉRVULO, A. C. O. Método de Granier e transpiração do mogno africano. 2016. 89 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2016.