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

da Costa, Antonio C. L.; Metcalfe, Dan LU ; Doughty, Chris E.; de Oliveira, Alexandre A. R.; Neto, Guilherme F. C.; da Costa, Mauricio C.; Silva Junior, Joao de Athaydes; Aragao, Luiz E. O. C.; Almeida, Samuel and Galbraith, David R., et al. (2014) In Plant Ecology & Diversity 7(1-2). p.7-24
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 (R-a) and heterotrophic respiration, and estimate gross primary productivity (GPP, the sum of NPP and R-a) and carbon-use efficiency (CUE, the ratio of NPP/GPP). Results: The TFR forest exhibited slightly lower NPP but slightly higher R-a,... (More)
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 (R-a) and heterotrophic respiration, and estimate gross primary productivity (GPP, the sum of NPP and R-a) and carbon-use efficiency (CUE, the ratio of NPP/GPP). Results: The TFR forest exhibited slightly lower NPP but slightly higher R-a, 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 R-a relative to the undroughted control, potentially causing the droughted forest to act as a net source of CO2. (Less)
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publication status
published
subject
keywords
drought, carbon cycling, Caxiuana National Forest Reserve, climate, change, tropical rainforest, biomass allocation, CUE, GPP, NPP, PCE
in
Plant Ecology & Diversity
volume
7
issue
1-2
pages
7 - 24
publisher
Taylor & Francis
external identifiers
  • wos:000336082900002
  • scopus:84893214546
ISSN
1755-0874
DOI
10.1080/17550874.2013.798366
language
English
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no
id
50bdabb1-44c9-419e-86e5-d743fc691c75 (old id 4643698)
date added to LUP
2014-09-26 08:02:02
date last changed
2017-09-10 03:18:15
@article{50bdabb1-44c9-419e-86e5-d743fc691c75,
  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 (R-a) and heterotrophic respiration, and estimate gross primary productivity (GPP, the sum of NPP and R-a) and carbon-use efficiency (CUE, the ratio of NPP/GPP). Results: The TFR forest exhibited slightly lower NPP but slightly higher R-a, 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 R-a relative to the undroughted control, potentially causing the droughted forest to act as a net source of CO2.},
  author       = {da Costa, Antonio C. L. and Metcalfe, Dan and Doughty, Chris E. and de Oliveira, Alexandre A. R. and Neto, Guilherme F. C. and da Costa, Mauricio C. and Silva Junior, Joao de Athaydes and Aragao, Luiz E. O. C. and Almeida, Samuel and Galbraith, David R. and Rowland, Lucy M. and Meir, Patrick and Malhi, Yadvinder},
  issn         = {1755-0874},
  keyword      = {drought,carbon cycling,Caxiuana National Forest Reserve,climate,change,tropical rainforest,biomass allocation,CUE,GPP,NPP,PCE},
  language     = {eng},
  number       = {1-2},
  pages        = {7--24},
  publisher    = {Taylor & Francis},
  series       = {Plant Ecology & Diversity},
  title        = {Ecosystem respiration and net primary productivity after 8-10 years of experimental through-fall reduction in an eastern Amazon forest},
  url          = {http://dx.doi.org/10.1080/17550874.2013.798366},
  volume       = {7},
  year         = {2014},
}