Amendola D. auteur aut IRD Mutema M. auteur aut IRD Rosolen V. auteur aut IRD Chaplot Vincent auteur aut IRD text journalArticle eng text/pdf born digital access Wetland soils are an important component of the Global Carbon Cycle because they store about 20-25% of the terrestrial soil organic carbon (SOC). Wetlands occupy about 6% of the global land surface and any change in their use or management has potentially dramatic consequences on greenhouse gases emissions. However, the capacity of wetland soils to store carbon (C) differs from place to place due to reasons still not well understood. The objective of this review was to evaluate the global variations in wetlands SOC content (SOCc) and to relate it to key soil and environmental factors such as soil texture, intensity of soil hydromorphy, metallic element content and climate. A comprehensive data analysis was performed using 122 soil profiles from 29 studies performed under temperate, humid, sub-humid, tropical and sub-arctic conditions. The results point to average SOCc of 53.5 +/- 15.8 g C kg(-1) with a maximum of 540 g C kg(-1). SOCc increased with increase in intensity of soil hydromorphy (r = - 0.52), Al (r = 0.19) and Fe content (r = 0.21), and decreased with soil pH (r = - 0.24). There was also a surprising tendency for intensity of soil hydromorphy, and thus SOCc, to decrease with increasing mean annual precipitation and soil clay content. These results contribute to a better understanding of the impact of soil hydromorphy in wetlands on organic C stabilization in the soils. However, further studies with additional information on soil bulk density to assess carbon C stocks, still need to be performed. specialized Biogeochemical cycle Climate change Gleysols Organic matter decomposition Redoxymorphic features 068 021 324 9-17 2018 0016-7061 https://www.documentation.ird.fr/hor/fdi:010072807 10.1016/j.geoderma.2018.03.005 0016-7061 [F B010072807] https://www.documentation.ird.fr/hor/fdi:010072807 https://www.documentation.ird.fr/intranet/publi/2018/05/010072807.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2018-06-01 2023-07-11 fdi:010072807 fre