A new probabilistic canopy dynamics model (SLCD) that is suitable for evergreen and deciduous forest ecosystems

Sainte-Marie, Julien; André, Laurent Saint; Nouvellon, Yann; Laclau, Jean‐Paul; Roupsard, Olivier; Maire, Guerric le; Delpierre, Nicolas; Henrot, Alexandra‐Jane; Barrandon, Matthieu

doi:10.1016/j.ecolmodel.2014.01.026

Cited by 13 publications

(5 citation statements)

References 70 publications

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“…These recurrent biological events are controlled by genetic (Neeman 1993) and environmental factors (Diez et al 2014, Hakkinen et al 1998, Sainte-Marie et al 2014, as well as by community structure and competition . Phenology is used as an integrative measure of plant responses to environmental changes , Schwartz 2013.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of four approaches to assess phenology of Populus in a short-rotation coppice culture

Vanbeveren¹,

Bloemen²,

Balzarolo³

et al. 2016

iForest

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We compared four approaches to assess phenology in a short-rotation coppice culture with 12 poplar (Populus) genotypes. The four approaches quantified phenology at different spatial scales and with different temporal resolutions: (i) visual observations of bud phenology; (ii) measurements of leaf area index; (iii) webcam images; and (iv) satellite images. For validation purposes we applied the four approaches during two years: the year preceding a coppice event and the year following the coppice event. The delayed spring greenup and the faster canopy development in the year after coppicing (as compared to the year before coppicing) were similarly quantified by the four approaches. The four approaches detected very similar seasonal changes in phenology, although they had different spatial scales and a different temporal resolution. The onset of autumn senescence after coppicing remained the same as in the year before coppicing according to the bud set observations, but it started earlier according to the webcam images, and later according to the MODIS images. In comparison to the year before coppicing, the growing season -in terms of leaf area duration -was shorter in the year after coppicing, while the leaf area index was higher.

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Section: Introductionmentioning

confidence: 99%

A comparative study of four approaches to assess phenology of Populus in a short-rotation coppice culture

Vanbeveren¹,

Bloemen²,

Balzarolo³

et al. 2016

iForest

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“…The plantations present a continuous foliar phenology with leaf production and leaf fall throughout the year. This has previously led to the development of a canopy dynamics model (Sainte-Marie et al, 2014). While this model was sufficient to explain leaf production and leaf fall dynamics, we found it necessary to develop a new cohort-based canopy dynamics model (summarised in Fig.…”

Section: Overview Of the Leaf Cohort Modelmentioning

confidence: 99%

“…Because those ecosystems have a continuous phenology, it required the creation of a leaf cohort model (see e.g. Sainte-Marie et al, 2014) that explicitly takes into account the effect of K on different leaf-level processes (leaf expansion, lifespan, etc. ).…”

Section: Introductionmentioning

confidence: 99%

Potassium limitation of forest productivity – Part 1: A mechanistic model simulating the effects of potassium availability on canopy carbon and water fluxes in tropical eucalypt stands

Cornut¹,

Delpierre²,

Laclau³

et al. 2023

Biogeosciences

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Abstract. The extent of the potassium (K) limitation of forest productivity is probably more widespread than previously thought, and K limitation could influence the response of forests to future global changes. To understand the effects of K limitation on forest primary production, we have developed the first ecophysiological model simulating the K cycle and its interactions with the carbon (C) and water cycles. We focused on the limitation of the gross primary productivity (GPP) by K availability in tropical eucalypt plantations in Brazil. We used results from stand-scale fertilisation experiments as well as C flux measurements in two tropical eucalypt plantations to parameterise the model. The model was parameterised for fertilised conditions and then used to test for the effects of contrasting additions of K fertiliser. Simulations showed that K deficiency limits GPP by more than 50 % during a 6-year rotation, a value in agreement with estimations in K-limited eucalypt stands. Simulations showed a decrease of modelled canopy transpiration of around 50 % and a decrease in modelled water-use efficiency WUEGPP of 10 %. Through a sensitivity analysis, we used the model to identify the most critical processes to consider when studying K limitation of GPP. The inputs of K to the stands, such as the atmospheric deposition and weathering fluxes, and the regulation of the cycle of K within the ecosystem were critical for the response of the system to K deficiency. Litter leaching processes were of lower importance, since residence time of K in litter was low. The new forest K-cycle model developed in the present study includes multiple K processes interacting with the carbon and water cycles, and strong feedbacks on GPP were outlined. This is a first step in identifying the source or sink limitation of forest growth by K.

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“…Currently, LSMs use empirical relationships, such as fixed coefficients, allometric relations, or optimization theory, to determine carbon allocation to leaf growth [36]. The phenology of leaf allocation has rarely been considered, particularly in evergreen forests (but see [37]). It is widely assumed that leaf phenology is driven by seasonal variation in F NPP alone.…”

Section: Introductionmentioning

confidence: 99%

Temporal Dynamics of Canopy Properties and Carbon and Water Fluxes in a Temperate Evergreen Angiosperm Forest

Renchon,

Haverd,

Trudinger

et al. 2024

Forests

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The forest–atmosphere exchange of carbon and water is regulated by meteorological conditions as well as canopy properties such as leaf area index (LAI, m2 m−2), photosynthetic capacity (PC μmol m−2 s−1), or surface conductance in optimal conditions (Gs, opt, mmol m−2 s−1), which can vary seasonally and inter-annually. This variability is well understood for deciduous species but is poorly characterized in evergreen forests. Here, we quantify the seasonal dynamics of a temperate evergreen eucalypt forest with estimates of LAI, litterfall, carbon and water fluxes, and meteorological conditions from measurements and model simulations. We merged MODIS Enhanced Vegetation Index (EVI) values with site-based LAI measurements to establish a 17-year sequence of monthly LAI. We ran the Community Atmosphere Biosphere Land Exchange model (CABLE-POP (version r5046)) with constant and varying LAI for our site to quantify the influence of seasonal canopy dynamics on carbon and water fluxes. We observed that the peak of LAI occurred in late summer–early autumn, with a higher and earlier peak occurring in years when summer rainfall was greater. Seasonality in litterfall and allocation of net primary productivity (FNPP) to leaf growth (af, 0–1) drove this pattern, suggesting a complete renewal of the canopy before the timing of peak LAI. Litterfall peaked in spring, followed by a high af in summer, at the end of which LAI peaked, and PC and Gs,opt reached their maximum values in autumn, resulting from a combination of high LAI and efficient mature leaves. These canopy dynamics helped explain observations of maximum gross ecosystem production (FGEP) in spring and autumn and net ecosystem carbon loss in summer at our site. Inter-annual variability in LAI was positively correlated with Net Ecosystem Production (FNEP). It would be valuable to apply a similar approach to other temperate evergreen forests to identify broad patterns of seasonality in leaf growth and turnover. Because incorporating dynamic LAI was insufficient to fully capture the dynamics of FGEP, observations of seasonal variation in photosynthetic capacity, such as from solar-induced fluorescence, should be incorporated in land surface models to improve ecosystem flux estimates in evergreen forests.

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A new probabilistic canopy dynamics model (SLCD) that is suitable for evergreen and deciduous forest ecosystems

Cited by 13 publications

References 70 publications

A comparative study of four approaches to assess phenology of Populus in a short-rotation coppice culture

A comparative study of four approaches to assess phenology of Populus in a short-rotation coppice culture

Potassium limitation of forest productivity – Part 1: A mechanistic model simulating the effects of potassium availability on canopy carbon and water fluxes in tropical eucalypt stands

Temporal Dynamics of Canopy Properties and Carbon and Water Fluxes in a Temperate Evergreen Angiosperm Forest

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