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4 results on '"Neto, Guilherme F.C."'

1. Ecosystem respiration and net primary productivity after 8-10 years of experimental through-fall reduction in an eastern Amazon forest

Author

da Costa, Antonio Carlos Lola, Metcalfe, Daniel B, Doughty, C. E, de Oliveira, Alex AR, Neto, Guilherme F.C., da Costa, Mauricio, de Athaydes Silva Junior, Joao, Aragao, L. E. O. C., Almeida, Samuel, Galbraith, David, Rowland, Lucy, Meir, Patrick, Malhi, Yadvinder, da Costa, Antonio Carlos Lola, Metcalfe, Daniel B, Doughty, C. E, de Oliveira, Alex AR, Neto, Guilherme F.C., da Costa, Mauricio, de Athaydes Silva Junior, Joao, Aragao, L. E. O. C., Almeida, Samuel, Galbraith, David, Rowland, Lucy, Meir, Patrick, and Malhi, Yadvinder

Abstract

Background: There is much interest in how the Amazon rainforest may respond to future rainfall reduction. However, there are relatively few ecosystem-scale studies to inform this debate. Aims: We described the carbon cycle in a 1 ha rainforest plot subjec

Published
2014

2. Ecosystem respiration and net primary productivity after 8–10 years of experimental through-fall reduction in an eastern Amazon forest

Author

da Costa, Antonio C.L., primary, Metcalfe, Daniel B., additional, Doughty, Chris E., additional, de Oliveira, Alexandre A.R., additional, Neto, Guilherme F.C., additional, da Costa, Mauricio C., additional, Silva Junior, João de Athaydes, additional, Aragão, Luiz E.O.C., additional, Almeida, Samuel, additional, Galbraith, David R., additional, Rowland, Lucy M., additional, Meir, Patrick, additional, and Malhi, Yadvinder, additional

Published
2013
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3. Ecosystem respiration and net primary productivity after 8–10 years of experimental through-fall reduction in an eastern Amazon forest.

Author

da Costa, Antonio C.L., Metcalfe, Daniel B., Doughty, Chris E., de Oliveira, Alexandre A.R., Neto, Guilherme F.C., da Costa, Mauricio C., Silva Junior, João de Athaydes, Aragão, Luiz E.O.C., Almeida, Samuel, Galbraith, David R., Rowland, Lucy M., Meir, Patrick, and Malhi, Yadvinder

Subjects
FOREST ecology, RAIN forests, RESPIRATION in plants, PRIMARY productivity (Biology), RAINFALL, CARBON cycle, DROUGHTS
Abstract

Background:There is much interest in how the Amazon rainforest may respond to future rainfall reduction. However, there are relatively few ecosystem-scale studies to inform this debate. Aims:We described the carbon cycle in a 1 ha rainforest plot subjected to 8–10 consecutive years of ca. 50% through-fall reduction (TFR) and compare these results with those from a nearby, unmodified control plot in eastern Amazonia. Methods:We quantified the components of net primary productivity (NPP), autotrophic (Ra) and heterotrophic respiration, and estimate gross primary productivity (GPP, the sum ofNPPandRa) and carbon-use efficiency (CUE, the ratio ofNPP/GPP). Results:The TFR forest exhibited slightly lowerNPPbut slightly higherRa, such that forestCUEwas 0.29 ± 0.04 on the control plot but 0.25 ± 0.03 on the TFR plot. Compared with four years earlier, TFR plot leaf area index and small tree growth recovered and soil heterotrophic respiration had risen. Conclusions:This analysis tested and extended the key findings of a similar analysis 4 years earlier in the TFR treatment. The results indicated that, while the forest recovered from extended drought in some respects, it maintained higher overallRarelative to the undroughted control, potentially causing the droughted forest to act as a net source of CO2. [ABSTRACT FROM PUBLISHER]

Published
2014
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4. Ecosystem respiration and net primary productivity after 8–10 years of experimental through-fall reduction in an eastern Amazon forest

Author

Yadvinder Malhi, Costa, Antonio C.L. Da, Metcalfe, Daniel B., Doughty, Chris E., Oliveira, Alexandre A.R. De, Neto, Guilherme F.C., Costa, Mauricio C. Da, Junior, João De Athaydes Silva, Luiz E.O.C. Aragão, Almeida, Samuel, Galbraith, David R., Rowland, Lucy M., and Meir, Patrick

Subjects
15. Life on land
Abstract

Background: There is much interest in how the Amazon rainforest may respond to future rainfall reduction. However, there are relatively few ecosystem-scale studies to inform this debate. Aims: We described the carbon cycle in a 1 ha rainforest plot subjected to 8–10 consecutive years of ca. 50% through-fall reduction (TFR) and compare these results with those from a nearby, unmodified control plot in eastern Amazonia. Methods: We quantified the components of net primary productivity (NPP), autotrophic (Ra) and heterotrophic respiration, and estimate gross primary productivity (GPP, the sum of NPP and Ra) and carbon-use efficiency (CUE, the ratio of NPP/GPP). Results: The TFR forest exhibited slightly lower NPP but slightly higher Ra, such that forest CUE was 0.29 ± 0.04 on the control plot but 0.25 ± 0.03 on the TFR plot. Compared with four years earlier, TFR plot leaf area index and small tree growth recovered and soil heterotrophic respiration had risen. Conclusions: This analysis tested and extended the key findings of a similar analysis 4 years earlier in the TFR treatment. The results indicated that, while the forest recovered from extended drought in some respects, it maintained higher overall Ra relative to the undroughted control, potentially causing the droughted forest to act as a net source of CO2.

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