C-quest in the Amazon Basin

Prentice, I. C.; Lloyd, John E.

doi:10.1038/25224

Cited by 46 publications

(33 citation statements)

References 5 publications

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“…Tropical forests have a large potential to sequester carbon primarily through reforestation, agroforestry and conservation of existing forests (Brown, 1996) and the high productivity of tropical forests may make them particularly responsive to growth enhancement from increasing atmospheric CO 2 concentrations (Prentice and Lloyd, 1998). Furthermore, old-growth tropical forests can continue to serve as carbon sinks rather than reaching a steady state C equilibrium (Luyssaert et al, 2008;Lewis et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Ecosystem carbon storage and partitioning in a tropical seasonal forest in Southwestern China

Lü¹,

Yin²,

Jepsen³

et al. 2010

Forest Ecology and Management

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Section: Introductionmentioning

confidence: 99%

Ecosystem carbon storage and partitioning in a tropical seasonal forest in Southwestern China

Lü¹,

Yin²,

Jepsen³

et al. 2010

Forest Ecology and Management

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“…E-mail: saleska@fas.harvard.edu 7 Mailing address: Projeto LBA-Ecologia, Rua 24 de Outubro,3707,CP 31,PA,Brazil. to reforestation of abandoned agricultural lands and fire suppression (Hurtt et al 2002). Ecosystem modeling studies (Prentice and Lloyd 1998, Tian et al 1998 and some empirical studies (Grace et al 1995, Phillips et al 1998) have suggested that tropical forests might be large terrestrial sinks.…”

Section: Introductionmentioning

confidence: 99%

Carbon Balance and Vegetation Dynamics in an Old‐growth Amazonian Forest

Rice

Pyle

Saleska

et al. 2004

Ecological Applications

289

351

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Abstract. Amazon forests could be globally significant sinks or sources for atmospheric carbon dioxide, but carbon balance of these forests remains poorly quantified. We surveyed 19.75 ha along four 1-km transects of well-drained old-growth upland forest in the Tapajós National Forest near Santarém, Pará, Brazil (2Њ51Ј S, 54Њ58Ј W) in order to assess carbon pool sizes, fluxes, and climatic controls on carbon balance. In 1999 there were, on average, 470 live trees per hectare with diameter at breast height (dbh) Ն10 cm. The mean (and 95% CI) aboveground live biomass was 143.7 Ϯ 5.4 Mg C/ha, with an additional 48.0 Ϯ 5.2 Mg C/ha of coarse woody debris (CWD). ). The gain in live wood biomass was exceeded by respiration losses from CWD, resulting in an overall estimated net loss from total aboveground biomass of 1.9 Ϯ 1.0 Mg C·ha Ϫ1 ·yr Ϫ1. The presence of large CWD pools, high recruitment rate, and net accumulation of small-tree biomass, suggest that a period of high mortality preceded the initiation of this study, possibly triggered by the strong El Niñ o Southern Oscillation events of the 1990s. Transfer of carbon between live and dead biomass pools appears to have led to substantial increases in the pool of CWD, causing the observed net carbon release. The data show that biometric studies of tropical forests neglecting CWD are unlikely to accurately determine carbon balance. Furthermore, the hypothesized sequestration flux from CO 2 fertilization (Ͻ0.5 Mg C·ha Ϫ1 ·yr Ϫ1 ) would be comparatively small and masked for considerable periods by climate-driven shifts in forest structure and associated carbon balance in tropical forests.

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“…It has received considerable attention due to its potential capacity to act as a source or sink of atmospheric carbon dioxide (Grace et al, 1995a;Farquhar, 1996, 2008;Phillips et al, 1998;Prentice and Lloyd, 1998;Tian et al, 1998;Chambers and Silver, 2004;Lewis et al, 2004). Results from global carbon cycle models have suggested a potential significant effect of Amazonian forests on estimates of the global carbon budget (Prentice and Lloyd, 1998;Tian et al, 1998;Cox et al, 2000). Indeed, the study of Cox et al (2000), predicts large-scale forest dieback across Amazonia in the 21st century, with associated emissions contributing to an amplification of human-induced climate change.…”

Section: Introductionmentioning

confidence: 99%

Modelling basin-wide variations in Amazon forest productivity – Part 1: Model calibration, evaluation and upscaling functions for canopy photosynthesis

et al. 2009

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Abstract. Given the importance of Amazon rainforest in the global carbon and hydrological cycles, there is a need to parameterize and validate ecosystem gas exchange and vegetation models for this region in order to adequately simulate present and future carbon and water balances. In this study, a sun and shade canopy gas exchange model is calibrated and evaluated at five rainforest sites using eddy correlation measurements of carbon and energy fluxes.Results from the model-data evaluation suggest that with adequate parameterisation, photosynthesis models taking into account the separation of diffuse and direct irradiance and the dynamics of sunlit and shaded leaves can accurately represent photosynthesis in these forests. Also, stomatal conductance formulations that only take into account atmospheric demand fail to correctly simulate moisture and CO 2 fluxes in forests with a pronounced dry season, particularly during afternoon conditions. Nevertheless, it is also the case that large uncertainties are associated not only with the eddy correlation data, but also with the estimates of ecosystem respiration required for model validation. To accurately simulate Gross Primary Productivity (GPP) and energy partitioning the most critical parameters and model processes are the quantum yield of photosynthetic uptake, the maximum carboxylation capacity of Rubisco, and simulation of stomatal conductance.Correspondence to: L. M. Mercado (lmme@ceh.ac.uk) Using this model-data synergy, we developed scaling functions to provide estimates of canopy photosynthetic parameters for a range of diverse forests across the Amazon region, utilising the best fitted parameter for maximum carboxylation capacity of Rubisco, and foliar nutrients (N and P) for all sites.

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C-quest in the Amazon Basin

Cited by 46 publications

References 5 publications

Ecosystem carbon storage and partitioning in a tropical seasonal forest in Southwestern China

Ecosystem carbon storage and partitioning in a tropical seasonal forest in Southwestern China

Carbon Balance and Vegetation Dynamics in an Old‐growth Amazonian Forest

Modelling basin-wide variations in Amazon forest productivity – Part 1: Model calibration, evaluation and upscaling functions for canopy photosynthesis

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