Calcium-mediated stabilisation of soil organic carbon

Détails

Ressource 1Télécharger: 2017RowleyBiogeochemistry.pdf (2036.82 [Ko])
Etat: Serval
Version: Final published version
ID Serval
serval:BIB_C5A5B2541EC6
Type
Article: article d'un périodique ou d'un magazine.
Sous-type
Synthèse (review): revue aussi complète que possible des connaissances sur un sujet, rédigée à partir de l'analyse exhaustive des travaux publiés.
Collection
Publications
Titre
Calcium-mediated stabilisation of soil organic carbon
Périodique
Biogeochemistry
Auteur(s)
Rowley M. C., Grand S., Verrecchia E. P.
ISSN
0168-2563
ISSN-L
1573-515X
Statut éditorial
Publié
Date de publication
01/01/2018
Peer-reviewed
Oui
Volume
137
Pages
27-49
Langue
anglais
Résumé
Soils play an essential role in the global cycling of carbon and understanding the stabilisation mechanisms behind the preservation of soil organic carbon (SOC) pools is of globally recognised significance. Until recently, research into SOC stabilisation has predominantly focused on acidic soil environments and the interactions between SOC and aluminium (Al) or iron (Fe). The interactions between SOC and calcium (Ca) have typically received less attention, with fewer studies conducted in alkaline soils. Although it has widely been established that exchangeable Ca (CaExch) positively correlates with SOC concentration and its resistance to oxidation, the exact mechanisms behind this relationship remain largely unidentified. This synthesis paper critically assesses available evidence on the potential role of Ca in the stabilisation of SOC and identifies research topics that warrant further investigation. Contrary to the common view of the chemistry of base cations in soils, chemical modelling indicates that Ca2+ can readily exchange its hydration shell and create inner sphere complexes with organic functional groups. This review therefore argues that both inner- and outer-sphere bridging by Ca2+ can play an active role in the stabilisation of SOC. Calcium carbonate (CaCO3) can influence occluded SOC stability through its role in the stabilisation of aggregates; however, it could also play an unaccounted role in the direct sorption and inclusion of SOC. Finally, this review highlights the importance of pH as a potential predictor of SOC stabilisation mechanisms mediated by Al- or Fe- to Ca, and their respective effects on SOC dynamics.
Mots-clé
Calcium Soil organic carbon stabilisation Sorption Occlusion Polyvalent cation bridging Organo-mineral interactions
Web of science
Site de l'éditeur
Open Access
Oui
Création de la notice
14/03/2018 17:35
Dernière modification de la notice
09/05/2019 1:00
Données d'usage