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Accumulation ou fuite de carbone pour des sols cultivés du bassin de la Seine

Type de document
report
Langue source
Français
Titre français
Accumulation ou fuite de carbone pour des sols cultivés du bassin de la Seine
Titre anglais
Carbon accumulation or leakage for cultivated soils in the Seine basin
Auteur(s)
  • GARNIER Josette
  • BILLEN Gilles
  • TOURNEBIZE Julien
  • BARRÉ Pierre
  • BAUDIN François
Editeur(s)
Autre(s)
Id
BAPB969Z
Version
3259
Url zotero
https://www.zotero.org/groups/2567444/items/BAPB969Z
Date ajout
18 janvier 2021 16:36
Date modification
12 avril 2021 17:19
Résumé français
The stock of organic matter in soils is recognized as a major component of the global carbon cycle, and its variations can significantly affect the atmospheric concentration of carbon dioxide responsible for climate change. Through the study of sub-surface runoff and dissolved organic carbon at the outlet of a small drained experimental basin (giant lysimeter), a relationship between these two variables was established that allowed carbon leaching to be taken into account in the AMG model of soil carbon dynamics. Until recently, no analytical method was able to quantify the persistent pool of organic carbon, which is essential for the modelling of organic carbon dynamics in soils. The Rock-Eval (RE) thermal analysis proved effective in characterizing the soil carbon stock of 52 agricultural plots in the Seine basin and assessing their status in terms of storage or loss. On average the studied soils are destocking (about - 2.4 ‰ per year, with a high variability: - 22 to +26 ‰ per year). Under current hydrological conditions (average total runoff of 175 mm yr-1), leaching of dissolved organic carbon has little effect on soil carbon dynamics. However, with an increase in the water depth of to 380 mm yr-1 (observed maximum) or to 600 mm yr-1 (hypothetical maximum) the decrease in the equilibrium stock would be 1.3% and 3% respectively, while loss rate would increase by 10 and 20%. .
Résumé anglais
The stock of organic matter in soils is recognized as a major component of the global carbon cycle, and its variations can significantly affect the atmospheric concentration of carbon dioxide responsible for climate change. Through the study of sub-surface runoff and dissolved organic carbon at the outlet of a small drained experimental basin (giant lysimeter), a relationship between these two variables was established that allowed carbon leaching to be taken into account in the AMG model of soil carbon dynamics. Until recently, no analytical method was able to quantify the persistent pool of organic carbon, which is essential for the modeling of organic carbon dynamics in soils. The Rock-Eval (RE) thermal analysis proved effective in characterizing the soil carbon stock of 52 agricultural plots in the Seine basin and assessing their status in terms of storage or loss. On average the studied soils are destocking (about - 2.4 ‰ per year, with a high variability: - 22 to +26 ‰ per year). Under current hydrological conditions (average total runoff of 175 mm yr-1), leaching of dissolved organic carbon has little effect on soil carbon dynamics. However, with an increase in the water depth of to 380 mm yr-1 (observed maximum) or to 600 mm yr-1 (hypothetical maximum) the decrease in the equilibrium stock would be 1.3% and 3% respectively, while loss rate would increase by 10 and 20%. .
Note
None
CRAW tags
  • AB - Non-spécifique
  • FREDO environnement
  • GEO France
WEB tags