Soil organic carbon sequestration in temperate agroforestry systems – A meta-analysis

Wiesmeier Martin, Mayer Stefanie, Sakamoto Eva, Hübner Rico, Cardinael Rémi, Kühnel Anna, Kögel-Knabner Ingrid. 2022. Soil organic carbon sequestration in temperate agroforestry systems – A meta-analysis. In : En transition vers un monde viable. Québec : Université de Laval-IUAF-ICRAF, Résumé, 1 p. Congrès mondial d'agroforesterie. 5, Québec, Canada, 17 Juillet 2022/20 Juillet 2022.

Url - éditeur : https://conferium.com/Clients/226_web/index.lasso?lang=fr

Résumé : Soil organic carbon (SOC) sequestration by improved agricultural practices is an acclaimed strategy to combat climate change. Nevertheless, the aim of increasing of SOC encounters limitations, e.g. with regards to permanence of carbon storage or leakage effects in food production. Agroforestry systems (AFS) are a promising land use option that can sequester substantial amounts of SOC while addressing these challenges. With a focus on temperate climate zones worldwide, available information on SOC in AFS was reviewed to determine their SOC sequestration potential and respective controlling factors. From a total of 61 observations, SOC sequestration rates in soils of AFS were derived for alley cropping systems (n = 25), hedgerows (n = 26) and silvopastoral systems (n = 10). The results showed that AFS have a potential for substantial SOC sequestration in temperate climates. SOC stocks were higher in the topsoil (0–20 cm) than in the control in more than 70% of the observations, and higher within the subsoil (20–40 cm) for 81% of all observations, albeit large variation in the data. The mean SOC sequestration rates were slightly higher at 0–20 cm (0.21±0.79 t ha-1 yr-1) compared to 20–40 cm soil depth (0.15±0.26 t ha-1 yr-1). Hedgerows revealed highest SOC sequestration rates in topsoils and subsoils (0.32±0.26 and 0.28±0.15 t ha-1 yr-1, respectively), followed by alley cropping systems (0.26±1.15 and 0.23±0.25 t ha-1 yr-1) and silvopastoral systems showing a slight mean SOC loss (-0.17±0.50 and -0.03±0.26 t ha-1 yr-1). Moreover, SOC sequestration rates tended to be higher for AFS with broadleaf tree species compared to coniferous species. We conclude that temperate AFS sequester significant amounts of SOC in topsoils and subsoils and represent one of the most promising agricultural measures for climate change mitigation and adaptation.

Mots-clés libres : Agroforestry, Soil organic carbon, Meta-analysis

Auteurs et affiliations

• Wiesmeier Martin, Technical University of Munich (DEU)
• Mayer Stefanie, Technical University of Munich (DEU)
• Sakamoto Eva, Technical University of Munich (DEU)
• Hübner Rico, Technical University of Munich (DEU)
• Cardinael Rémi, CIRAD-PERSYST-UPR AIDA (ZWE) ORCID: 0000-0002-9924-3269
• Kühnel Anna, Bavarian State Research Center for Agriculture (DEU)
• Kögel-Knabner Ingrid, Technical University of Munich (DEU)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/601884/)

Métriques

[ Page générée et mise en cache le 2024-12-04 ]