Above-ground biomass and productivity in a rain forest of eastern South America

Chave, Jérôme; Olivier, Jean-Marc; Bongers, Frans; Châtelet, Patrick; Forget, Pierre‐Michel; Meer, Peter van der; Norden, Natalia; Riéra, Bernard; Charles-Dominique, Pierre

doi:10.1017/s0266467408005075

Cited by 148 publications

(117 citation statements)

References 58 publications

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“…The first modified parameter value is f alloc,leaf which is slightly increased from 0.27 to 0.30, supported by NPP leaf estimates reported by Chave et al (2008) for Nouragues in central French Guiana and by the findings of Malhi et al (2011) for 35 sites in tropical evergreen forests worldwide. The latter reported a fraction of 0.41 NPP tot allocated to the entire canopy (leaves, flowers, fruits and fine twigs) that, assuming that the percentage of leaves is 73 % (Malhi et al, 2011), results in an f alloc,leaf value of 0.3.…”

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confidence: 59%

Seasonal leaf dynamics for tropical evergreen forests in a process-based global ecosystem model

et al. 2012

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Abstract. The influence of seasonal phenology on canopy photosynthesis in tropical evergreen forests remains poorly understood, and its representation in global ecosystem models is highly simplified, typically with no seasonal variation of canopy leaf properties taken into account. Including seasonal variation in leaf age and photosynthetic capacity could improve the correspondence of global vegetation model outputs with the wet-dry season CO 2 patterns measured at flux tower sites in these forests. We introduced a leaf litterfall dynamics scheme in the global terrestrial ecosystem model ORCHIDEE based on seasonal variations in net primary production (NPP), resulting in higher leaf turnover in periods of high productivity. The modifications in the leaf litterfall scheme induce seasonal variation in leaf age distribution and photosynthetic capacity. We evaluated the results of the modification against seasonal patterns of three long-term in-situ leaf litterfall datasets of evergreen tropical forests in Panama, French Guiana and Brazil. In addition, we evaluated the impact of the model improvements on simulated latent heat (LE) and gross primary productivity (GPP) fluxes for the flux tower sites Guyaflux (French Guiana) and Tapajós (km 67, Brazil). The results show that the introduced seasonal leaf litterfall corresponds well with field inventory leaf litter data and times with its seasonality. Although the simulated litterfall improved substantially by the model modifications, the impact on the modelled fluxes remained limited. The seasonal pattern of GPP improved clearly for the Guyaflux site, but no significant improvement was obtained for the Tapajós site. The seasonal pattern of the modelled latent heat fluxes was hardly changed and remained consistent with the observed fluxes. We conclude that we introduced a realistic and generic litterfall dynamics scheme, but that other processes need to be improved in the model to achieve better simulations of GPP seasonal patterns for tropical evergreen forests.

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confidence: 59%

Seasonal leaf dynamics for tropical evergreen forests in a process-based global ecosystem model

et al. 2012

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“…Despite this requirement, most of the past studies in tropical forests are found to be limited to analyzing the aboveground systems (Chave et al 2008;Djomo et al 2011;Malhi et al 2011;Doughty et al 2013;Ngo et al 2013;Girardin et al 2014;Malhi et al 2014) and only a few studies concern to the belowground aspects (Ibrahima et al 2010;Powers and Perez-Aviles 2013;Noguchi et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Effect of disturbance on biomass, production and carbon dynamics in moist tropical forest of eastern Nepal

Gautam

Mandal

2016

For. Ecosyst.

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Background: Forest biomass is helpful to assess its productivity and carbon (C) sequestration capacity. Several disturbance activities in tropical forests have reduced the biomass and net primary production (NPP) leading to climate change. Therefore, an accurate estimation of forest biomass and C cycling in context of disturbances is required for implementing REDD (Reducing Emissions from Deforestation and Forest Degradation) policy. Methods: Biomass and NPP of trees and shrubs were estimated by using allometric equations while herbaceous biomass was estimated by harvest method. Fine root biomass was determined from soil monolith. The C stock in vegetation was calculated by multiplying C concentration to dry weight.

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“…Lianas and trees are the two dominant plant growth forms in tropical forests, and there is a growing body of evidence suggesting that lianas are increasing relative to trees in Neotropical forests (Phillips et al 2002, Benı´tez-Malvido and Martı´nez-Ramos 2003, S. J. Wright et al 2004, Chave et al 2008, Foster et al 2008, Schnitzer and Bongers 2011, Yorke et al 2013, Schnitzer 2015. We are not sure why.…”

Section: Introductionmentioning

confidence: 99%

Lianas always outperform tree seedlings regardless of soil nutrients: results from a long‐term fertilization experiment

Pasquini

Wright

Santiago

2015

Ecology

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bstract. Lianas are a prominent growth form in tropical forests, and there is compelling evidence that they are increasing in abundance throughout the Neotropics. While recent evidence shows that soil resources limit tree growth even in deep shade, the degree to which soil resources limit lianas in forest understories, where they coexist with trees for decades, remains unknown. Regardless, the physiological underpinnings of soil resource limitation in deeply shaded tropical habitats remain largely unexplored for either trees or lianas. Theory predicts that lianas should be more limited by soil resources than trees because they occupy the quick-return end of the ''leaf economic spectrum,'' characterized by high rates of photosynthesis, high specific leaf area, short leaf life span, affinity to high-nutrient sites, and greater foliar nutrient concentrations. To address these issues, we asked whether soil resources (nitrogen, phosphorus, and potassium), alone or in combination, applied experimentally for more than a decade would cause significant changes in the morphology or physiology of tree and liana seedlings in a lowland tropical forest. We found evidence for the first time that phosphorus limits the photosynthetic performance of both trees and lianas in deeply shaded understory habitats. More importantly, lianas always showed significantly greater photosynthetic capacity, quenching, and saturating light levels compared to trees across all treatments. We found little evidence for nutrient 3 growth form interactions, indicating that lianas were not disproportionately favored in nutrient-rich habitats. Tree and liana seedlings differed markedly for six key morphological traits, demonstrating that architectural differences occurred very early in ontogeny prior to lianas finding a trellis (all seedlings were self-supporting). Overall, our results do not support nutrient loading as a mechanism of increasing liana abundance in the Neotropics. Rather, our finding that lianas always outperform trees, in terms of photosynthetic processes and under contrasting rates of resource supply of macronutrients, will allow lianas to increase in abundance if disturbance and tree turnover rates are increasing in Neotropical forests as has been suggested.

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Above-ground biomass and productivity in a rain forest of eastern South America

Abstract: Abstract:The dynamics of tropical forest woody plants was studied at the Nouragues

Cited by 148 publications

References 58 publications

Seasonal leaf dynamics for tropical evergreen forests in a process-based global ecosystem model

Seasonal leaf dynamics for tropical evergreen forests in a process-based global ecosystem model

Effect of disturbance on biomass, production and carbon dynamics in moist tropical forest of eastern Nepal

Lianas always outperform tree seedlings regardless of soil nutrients: results from a long‐term fertilization experiment

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