Tree and stand light use efficiencies over a full rotation of single- and mixed-species Eucalyptus grandis and Acacia mangium plantations

Maire, Guerric le; Nouvellon, Yann; Christina, Mathias; Ponzoni, Flávio Jorge; Gonçalves, José Leonardo de Moraes; Bouillet, Jean‐Pierre; Laclau, Jean‐Paul

doi:10.1016/j.foreco.2012.03.005

Cited by 111 publications

(61 citation statements)

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“…Stand 2 differs from the others in that it was examined for a whole rotation period, which spanned the age of 1 to 6 years. During this time the mean tree heights were between 2.5 to 24.4 m and the stand L increased to its peak at about age 3 years before stabilizing and finally declining towards the end of the rotation (le Maire et al 2013). During this rotation period there may be significant changes in leaf display, however, there was no clear relationship between age and k H for either species.…”

Section: Resultsmentioning

confidence: 95%

“…Maestra was also tested in an experiment containing monocultures and mixtures of Eucalyptus grandis and Acacia mangium (Stand 2 in Table 1; le Maire et al 2013). Gap fractions were slightly overestimated by Maestra in the monocultures and underestimated in the mixtures, which resulted in underestimates of APAR of 3.4% for A. mangium monocultures, 4.5% for E. grandis monocultures and overestimates of 4.6% for 1:1 mixtures.…”

Section: Description Of Detailed Tree-level Light Modelmentioning

confidence: 99%

“…Some of these models, such as the Maestra (or Maestro) model (Grace et al 1987;Wang and Jarvis 1990;Medlyn 2004), have been shown to provide realistic predictions of absorbed light in mixed-species stands (le Maire et al 2013;Charbonnier et al 2013). However, these tree-level models often require extensive input data and can have high computational demands.…”

Section: Introductionmentioning

confidence: 99%

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Using a stand-level model to predict light absorption in stands with vertically and horizontally heterogeneous canopies

et al. 2014

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Background: Forest ecosystem functioning is strongly influenced by the absorption of photosynthetically active radiation (APAR), and therefore, accurate predictions of APAR are critical for many process-based forest growth models. The Lambert-Beer law can be applied to estimate APAR for simple homogeneous canopies composed of one layer, one species, and no canopy gaps. However, the vertical and horizontal structure of forest canopies is rarely homogeneous. Detailed tree-level models can account for this heterogeneity but these often have high input and computational demands and work on finer temporal and spatial resolutions than required by stand-level growth models. The aim of this study was to test a stand-level light absorption model that can estimate APAR by individual species in mixed-species and multi-layered stands with any degree of canopy openness including open-grown trees to closed canopies. Methods: The stand-level model was compared with a detailed tree-level model that has already been tested in mixed-species stands using empirical data. Both models were parameterised for five different forests, including a wide range of species compositions, species proportions, stand densities, crown architectures and canopy structures.

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Section: Resultsmentioning

confidence: 95%

Section: Description Of Detailed Tree-level Light Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Using a stand-level model to predict light absorption in stands with vertically and horizontally heterogeneous canopies

et al. 2014

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“…Multiple allometric relationships calibrated for different ages and for different plots are needed for tree-scale PBMs. Some previous studies of light use with the MAESTRA or MAESPA model assumed a nominal position for trees within the stands (Christina et al 2015;le Maire et al 2013), while others estimated the tree position using in situ measurements, aerial photography, or very high resolution satellite images (Charbonnier et al 2013;Forrester et al 2013b;Gspaltl et al 2013). The assumption of a regular spacing could bias Fig.…”

Section: Tree-scale Parameter Variabilitymentioning

confidence: 99%

Sensitivity and uncertainty analysis of the carbon and water fluxes at the tree scale inEucalyptusplantations using a metamodeling approach

et al. 2016

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Understanding the consequences of changes in climatic and biological drivers on tree carbon and water fluxes is essential in forestry. Using a metamodeling approach, sensitivity and uncertainty analyses were carried out for a tree-scale model (MAESPA) to isolate the effects of climate, morphological and physiological traits, and intertree competition on the absorption of photosynthetically active radiation (APAR), gross primary production (GPP), transpiration (TR), light use efficiency (LUE), and water use efficiency (WUE) in clonal Eucalyptus plantations. The metamodel predicting daily TR was validated using one year of sap flow measurements and showed close agreement with the measurements (mean percentage error = 11%, n = 2155). Simulations showed that APAR, GPP, and TR were very sensitive to the tree morphology and to a competition index representing its local environment. LUE and WUE were, in addition, very sensitive to the natural variability of the physiological leaf and root parameters. A maximum percentage error of 10% in these parameters leads to 18%, 17%, 16%, 9%, and 18% uncertainty for APAR, GPP, TR, LUE, and WUE, respectively. The uncertainties in TR were highest for the smallest trees. This study highlighted the need to take account of the spatial and temporal variability of tree traits and environmental conditions for simulations at the tree scale.

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“…This was always associated with more stratified canopies (Binkley et al, 1992;Forrester et al, 2012;le Maire et al, 2013;Menalled et al, 1998;Nouvellon et al, 2012).…”

Section: Discussionmentioning

confidence: 95%

High diversity mixed plantations in Brazil: <em>Eucalyptus</em> intercropped with native tree species

Amazonas¹

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Tree and stand light use efficiencies over a full rotation of single- and mixed-species Eucalyptus grandis and Acacia mangium plantations

Cited by 111 publications

References 50 publications

Using a stand-level model to predict light absorption in stands with vertically and horizontally heterogeneous canopies

Using a stand-level model to predict light absorption in stands with vertically and horizontally heterogeneous canopies

Sensitivity and uncertainty analysis of the carbon and water fluxes at the tree scale inEucalyptusplantations using a metamodeling approach

High diversity mixed plantations in Brazil: <em>Eucalyptus</em> intercropped with native tree species

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