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Distributed modeling of ecohydrological processes at high spatial resolution over a landscape having patches of managed forest stands and crop fields in SW Europe

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  • Govind, Ajit
  • Cowling, Sharon
  • Kumari, Jyothi
  • Rajan, Nithya
  • Al-Yaari, Amen

Abstract

We simulated the ecohydrological processes of a forest-dominated landscape that comprises of managed maritime pine stands and crops in the Landes de Gascogne region of South West France. We used an improved model called STEPS that describes ecophysiological, biogeochemical and hydrological processes in a tightly coupled and spatially distributed manner, applicable to both pristine and managed ecosystems. Simulated gross primary productivity (GPP) and evapotranspiration (ET) showed large spatial variability over this landscape owing to the heterogeneities inherent in land cover, soil texture, topography and soil hydrology. Croplands (mainly maize) exhibited higher ranges of GPP (200–2500 gcm−2yr−1) and ET fluxes (150–800mmyr−1) variability, relative to other land cover types, primarily due to the presence of fallow versus cultivated lands. The pine stands also showed considerable spatial variability in GPP (426–1320gcm−2yr−1) and ET (234–570mmyr−1) but this occurred mainly as a function of stand age and the understory species compositions. Comparison of simulated values with measurements taken at the LeBray stand revealed reasonable model performance for both GPP (R2=0.92, RMSE=0.77gcm−2day−1) and ET (R2=0.81, RMSE=0.52mmday−1) as well as other ecohydrological indicators. Seasonal patterns of ET fluxes were more dynamic than GPP due to the presence of distinct subcomponent processes that were uniquely governed by several environmental factors. A sensitivity analysis of some parameters that are common to both GPP and ET simulation revealed that the most sensitive parameters were LAI, Ω and gs,max. This study will serve as the basis for further research on developing environmental management strategies specific to the Landes de Gascogne region of France.

Suggested Citation

  • Govind, Ajit & Cowling, Sharon & Kumari, Jyothi & Rajan, Nithya & Al-Yaari, Amen, 2015. "Distributed modeling of ecohydrological processes at high spatial resolution over a landscape having patches of managed forest stands and crop fields in SW Europe," Ecological Modelling, Elsevier, vol. 297(C), pages 126-140.
    • Handle: RePEc:eee:ecomod:v:297:y:2015:i:c:p:126-140
    DOI: 10.1016/j.ecolmodel.2014.10.019
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    References listed on IDEAS

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    1. Széles, Adrienn Ványiné & Megyes, Attila & Nagy, János, 2012. "Irrigation and nitrogen effects on the leaf chlorophyll content and grain yield of maize in different crop years," Agricultural Water Management, Elsevier, vol. 107(C), pages 133-144.
    2. Govind, Ajit & Chen, Jing Ming & Bernier, Pierre & Margolis, Hank & Guindon, Luc & Beaudoin, Andre, 2011. "Spatially distributed modeling of the long-term carbon balance of a boreal landscape," Ecological Modelling, Elsevier, vol. 222(15), pages 2780-2795.
    3. N. Gedney & P. M. Cox & R. A. Betts & O. Boucher & C. Huntingford & P. A. Stott, 2006. "Detection of a direct carbon dioxide effect in continental river runoff records," Nature, Nature, vol. 439(7078), pages 835-838, February.
    4. Govind, Ajit & Guyon, Dominique & Roujean, Jean-Louis & Yauschew-Raguenes, Nathalie & Kumari, Jyothi & Pisek, Jan & Wigneron, Jean-Pierre, 2013. "Effects of canopy architectural parameterizations on the modeling of radiative transfer mechanism," Ecological Modelling, Elsevier, vol. 251(C), pages 114-126.
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