A Look at Amazon Basin Seasonal Dynamics with the Biophysical ...
A Look at Amazon Basin Seasonal Dynamics with the Biophysical ... A Look at Amazon Basin Seasonal Dynamics with the Biophysical ...
3) Drought in an E. Amazonian rain forest: effects of the exclusion of rainfall from soil on leaf gas exchange.R Vale 1 , MM Chaves 1,2 , CJR Carvalho 3 , J Maroco 2 , S Almeida 4 , J Grace 5 , JS Pereira 1 , P Meir 51-Instituto Superior de Agronomia. Lisboa. Portugal. 2-Instituto de Tecnologia Química e Biológica. Oeiras. Portugal. 3-Lab. Ecofisiologia Vegetal. Embrapa Amazonia Oriental. Belém. Brasil. 4-Museu Goeldi. Belém. Brasil. 5-University ofEdinburgh. UK.Rainfall was experimentally excluded from 1 ha of E. Amazonian forest, at Caxiuana National Forest, Para usingtransparent plastic panels placed 1.5-2.5 m above the ground. Measurements were made of leaf gas exchange before andafter installation of the rainfall exclusion infrastructure. Measurements of stomatal conductance and the maximum rate ofcarboxylation and electron transport were measured on leaves at different levels throughout the vertical profile of thecanopy. Comparisons were made between adjacent control and treatment plots (1 ha) and with data obtained from a thirdplot 2km away, where weather and ecosystem flux measurements were also made. The exclusion of rainfall resulted in areduction in soil water volume content by more than 30% in comparison to the control measurements. Before theexperimental exclusion of rainfall no statistical differences could be discerned between leaves in the canopy profile at thedifferent sites. The effect of the experimental reduction in soil moisture on canopy physiology is discussed.
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3) Drought in an E. <strong>Amazon</strong>ian rain forest: effects of <strong>the</strong> exclusion of rainfall from soil on leaf gas exchange.R Vale 1 , MM Chaves 1,2 , CJR Carvalho 3 , J Maroco 2 , S Almeida 4 , J Grace 5 , JS Pereira 1 , P Meir 51-Instituto Superior de Agronomia. Lisboa. Portugal. 2-Instituto de Tecnologia Química e Biológica. Oeiras. Portugal. 3-Lab. Ecofisiologia Vegetal. Embrapa <strong>Amazon</strong>ia Oriental. Belém. Brasil. 4-Museu Goeldi. Belém. Brasil. 5-University ofEdinburgh. UK.Rainfall was experimentally excluded from 1 ha of E. <strong>Amazon</strong>ian forest, <strong>at</strong> Caxiuana N<strong>at</strong>ional Forest, Para usingtransparent plastic panels placed 1.5-2.5 m above <strong>the</strong> ground. Measurements were made of leaf gas exchange before andafter install<strong>at</strong>ion of <strong>the</strong> rainfall exclusion infrastructure. Measurements of stom<strong>at</strong>al conductance and <strong>the</strong> maximum r<strong>at</strong>e ofcarboxyl<strong>at</strong>ion and electron transport were measured on leaves <strong>at</strong> different levels throughout <strong>the</strong> vertical profile of <strong>the</strong>canopy. Comparisons were made between adjacent control and tre<strong>at</strong>ment plots (1 ha) and <strong>with</strong> d<strong>at</strong>a obtained from a thirdplot 2km away, where we<strong>at</strong>her and ecosystem flux measurements were also made. The exclusion of rainfall resulted in areduction in soil w<strong>at</strong>er volume content by more than 30% in comparison to <strong>the</strong> control measurements. Before <strong>the</strong>experimental exclusion of rainfall no st<strong>at</strong>istical differences could be discerned between leaves in <strong>the</strong> canopy profile <strong>at</strong> <strong>the</strong>different sites. The effect of <strong>the</strong> experimental reduction in soil moisture on canopy physiology is discussed.
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