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Effect of climate change and increased atmospheric CO 2 on hydrological and nitrogen cycling in an intensive agricultural headwater catchment in western France

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  • Jordy Salmon-Monviola
  • Pierre Moreau
  • Cyril Benhamou
  • Patrick Durand
  • Philippe Merot
  • François Oehler
  • Chantal Gascuel-Odoux

Abstract

Climate change and increased atmospheric CO 2 concentration can impact hydrological and nitrogen cycling at the catchment scale. The objective of this study is to assess these impacts in an intensive agricultural headwater catchment in western France. A calibrated and validated agro-hydrological model was driven by output of the climate model ARPEGE under the A1B emission scenario over 30-year simulation periods. Our study indicated that with climate warming and increased atmospheric CO 2 , the main trends in water balance were a decrease in annual actual evapotranspiration (AET), a decrease in annual discharge and wetland extent, and a decrease in spring and summer of groundwater recharge and soil-water content. Not considering the effects of increased atmospheric CO 2 in the agro-hydrological model led to overestimating discharge decrease and underestimating AET decrease and wetland extent. Climate change could influence N cycling by increasing soil N mineralisation, increasing soil denitrification in wetlands and upstream areas, and decreasing NO 3 –N load to streams. Since wetlands appear to be sensitive to climate change, improving modelling to better predict their responses is an important issue, especially to help plan sustainable management of these vulnerable areas. Copyright Springer Science+Business Media Dordrecht 2013

Suggested Citation

  • Jordy Salmon-Monviola & Pierre Moreau & Cyril Benhamou & Patrick Durand & Philippe Merot & François Oehler & Chantal Gascuel-Odoux, 2013. "Effect of climate change and increased atmospheric CO 2 on hydrological and nitrogen cycling in an intensive agricultural headwater catchment in western France," Climatic Change, Springer, vol. 120(1), pages 433-447, September.
    • Handle: RePEc:spr:climat:v:120:y:2013:i:1:p:433-447
    DOI: 10.1007/s10584-013-0828-y
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    References listed on IDEAS

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    1. Yongsheng Xu & Zong-Liang Yang, 2012. "A method to study the impact of climate change on variability of river flow: an example from the Guadalupe River in Texas," Climatic Change, Springer, vol. 113(3), pages 965-979, August.
    2. Michela Biasutti & Adam Sobel & Suzana Camargo & Timothy Creyts, 2012. "Projected changes in the physical climate of the Gulf Coast and Caribbean," Climatic Change, Springer, vol. 112(3), pages 819-845, June.
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