GovindChenMcdonnellEtAl2011

Référence

Govind, A., Chen, J.M., Mcdonnell, J., Kumari, J. and Sonnentag, O. (2011) Effects of lateral hydrological processes on photosynthesis and evapotranspiration in a boreal ecosystem. Ecohydrology, 4(3):394-410. (Scopus )

Résumé

Landscape-scale hydrological processes can greatly alter the local-scale water balance and many ecological processes linked to it. We hypothesized that in humid forest ecosystems, topographically driven lateral subsurface flow (SSF) has significant influence on ecophysiological processes such as gross primary productivity (GPP) and evapotranspiration (ET). To investigate how simplified hydrological conceptualizations influence the simulated ET and GPP in space and time, we conducted a numerical experiment using a spatially explicit hydroecological model, BEPS-TerrainLab V2.0. We constructed three modelling scenarios: (1) Explicit, where a realistic calculation of SSF was employed considering topographic controls, (2) Implict, where the SSF calculations were based on a bucket-modelling approach and (3) NoFlow, where the SSF was turned-off in the model. Statistical analyses of model outputs showed considerable differences among the three scenarios for the simulated GPP and ET. The NoFlow scenario generally underestimated GPP and ET, while the Implicit scenario overestimated them relative to the Explicit scenario, both in time and space. GPP was more sensitive to SSF than ET because of the presence of unique compensatory mechanisms associated with the subcomponents of the total ET. The key mechanisms controlling GPP and ET were manifested through nonlinear changes in stomatal conductance, unique contributions from GPP and ET subcomponents, alterations in rhizosphere wetting patterns and their impacts on upscaling mechanisms and variability in nitrogen dynamics (for GPP). Feedback and interactive relationships between hydrological and ecophysiological processes also exacerbated the biases. Thus, we conclude that ecological models that have simplified hydrological representations could have significant errors in the estimation of GPP and ET. © 2010 John Wiley & Sons, Ltd.

Format EndNote

Vous pouvez importer cette référence dans EndNote.

Format BibTeX-CSV

Vous pouvez importer cette référence en format BibTeX-CSV.

Format BibTeX

Vous pouvez copier l'entrée BibTeX de cette référence ci-bas, ou l'importer directement dans un logiciel tel que JabRef .

@ARTICLE { GovindChenMcdonnellEtAl2011,
    AUTHOR = { Govind, A. and Chen, J.M. and Mcdonnell, J. and Kumari, J. and Sonnentag, O. },
    TITLE = { Effects of lateral hydrological processes on photosynthesis and evapotranspiration in a boreal ecosystem },
    JOURNAL = { Ecohydrology },
    YEAR = { 2011 },
    VOLUME = { 4 },
    NUMBER = { 3 },
    PAGES = { 394-410 },
    NOTE = { cited By 7 },
    ABSTRACT = { Landscape-scale hydrological processes can greatly alter the local-scale water balance and many ecological processes linked to it. We hypothesized that in humid forest ecosystems, topographically driven lateral subsurface flow (SSF) has significant influence on ecophysiological processes such as gross primary productivity (GPP) and evapotranspiration (ET). To investigate how simplified hydrological conceptualizations influence the simulated ET and GPP in space and time, we conducted a numerical experiment using a spatially explicit hydroecological model, BEPS-TerrainLab V2.0. We constructed three modelling scenarios: (1) Explicit, where a realistic calculation of SSF was employed considering topographic controls, (2) Implict, where the SSF calculations were based on a bucket-modelling approach and (3) NoFlow, where the SSF was turned-off in the model. Statistical analyses of model outputs showed considerable differences among the three scenarios for the simulated GPP and ET. The NoFlow scenario generally underestimated GPP and ET, while the Implicit scenario overestimated them relative to the Explicit scenario, both in time and space. GPP was more sensitive to SSF than ET because of the presence of unique compensatory mechanisms associated with the subcomponents of the total ET. The key mechanisms controlling GPP and ET were manifested through nonlinear changes in stomatal conductance, unique contributions from GPP and ET subcomponents, alterations in rhizosphere wetting patterns and their impacts on upscaling mechanisms and variability in nitrogen dynamics (for GPP). Feedback and interactive relationships between hydrological and ecophysiological processes also exacerbated the biases. Thus, we conclude that ecological models that have simplified hydrological representations could have significant errors in the estimation of GPP and ET. © 2010 John Wiley & Sons, Ltd. },
    AFFILIATION = { Unité de Recherche en Ecologie Fonctionnelle et Physique de l'Environnement (EPHYSE), INRA, Villenave d'Ornon, France; Department of Geography and Program in Planning, University of Toronto, ON, Canada; Department of Forest Engineering, Oregon State University, 97331, OR, United States; Department of Organismic and Evolutionary Biology, Harvard University, 02138, MA, United States },
    AUTHOR_KEYWORDS = { Boreal ecosystems; Ecophysiological and hydrological coupling; Evapotranspiration; Gross primary productivity; Hydrological conceptualizations; Spatially explicit hydroecological modelling },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1002/eco.141 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-79956215594&doi=10.1002%2feco.141&partnerID=40&md5=d972385ec6ad969b956cf9ce8cd85de4 },
}

********************************************************** ***************** Facebook Twitter *********************** **********************************************************

Abonnez-vous à
l'Infolettre du CEF!

********************************************************** ***************** Pub - Mycorhizes_2019 ****************** **********************************************************

********************************************************** ***************** Pub - Symphonies_Boreales ****************** **********************************************************

********************************************************** ***************** Boîte à trucs *************** **********************************************************

CEF-Référence
La référence vedette !

Jérémie Alluard (2016) Les statistiques au moments de la rédaction 

  • Ce document a pour but de guider les étudiants à intégrer de manière appropriée une analyse statistique dans leur rapport de recherche.

Voir les autres...