Martial BERNOUX "Managing soil carbon through agro-ecological practices"

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Martial BERNOUX "Managing soil carbon through agro-ecological practices"

  1. 1. UNCCD 2nd Scientific Conference Economic assessment of desertification, sustainable land management and resilience of arid, semi-arid and dry sub-humid areas 9 - 12 April 2013 - Bonn, Germany THU 3.1: Agroecology as a powerfull tool for the developement of drylands? Managing soil carbon through agro-ecological practices:a win-win strategy attending both global (fight against climate change) and local problems (soil degradation) Martial Bernoux, Tiphaine Chevallier, Jean-Luc Chotte Functional Ecology & Biogeochemistry of Soils & Agro-ecosystems A French Multi-institute Research group based in Montpellier www.montpellier.inra.fr/ecosols
  2. 2. The dominant vision since1992 (UNFCCC) Mitigation Soil of GHG Carbon GLOBAL Problems/Solutions Actions/Implementations LOCAL
  3. 3. It is time to recognize that “soil carbon” is not just a matter of FOOD “Mitigation” and “Climate Change” … SECURITY Increase agronomic productivity POVERTY ALLEVIATION Soil Water Control or fertility retention reversal of UNCCD degradation and Mitigation Soil Erosion desertification of trends GHG Carbon control In a context of adaptation to global change increasing resilience and decreasing vulnerabilityGLOBAL Problems/Solutions Actions/Implementations LOCAL How to maximize trade-offs and find synergies
  4. 4. Most sequestering practices show synergies with yield increase Even in drylands were it is most needed! Regions Sustainable land management Net mitigation potential Average yield (Moisture categories (1) increase (2) regime) tCO2-eq /ha /yr1 % Dry Cool Warm Agronomy 0.39 0.39 116 Nutrient 0.33 0.33 72* management Tillage/residues 0.17 0.35 122 management Water management 1.14 1.14 92 Agroforestry 0.17 0.35 81 1IPCC (2006), 2 Branca et al. (2013),* considers only organic nutrient management But those values are too “coarse”, need to down scale… How to maximize trade-offs and find synergies
  5. 5. Available results at finer resolution?Geographical Distribution ofCarbon Sequestration Estimates But those values are too “coarse”, need to down scale…
  6. 6. Available results at finer resolution?Geographical Distribution ofCarbon Sequestration Estimates Lowest values! C market seems (is) inaccessible
  7. 7. Carbon market is dead (or nearly)…long live “practices-based” MarketMarket based on the impact/result of the practice / management options Market based on adoption of sequestering practicesEstimated results Verified result or management options Soil C Adoption of a practice that stock stores/preserves carbon Estimate measure time
  8. 8. Adoption of a practice that Need more “validation” studies of the practices and stores/preserves carbon their impacts in terms of soil C sequestration , and other co-benefits. Paucity of data for tropical and, even more, drylands! 200 200 C content variation from (a) Temperate region (b) Tropical region the control (base 100) 150 150 100 100 50 50 0 0 0 50 100 150 200 250 300 0 50 100 150 200 250 Total input of ramial wood (t DM / ha ) Adapted from Barthès et al. 2010. Effects of ramial wood amendments on crops and soil: A synthesis of experimental results.Photos © E. Hien Cah. Agric., 19, 280-87 (In French)
  9. 9. Fortune cookie message!“Soil Carbon is at the crossroads of the conventions and scales and provides multiples benefits” Soil GLOBAL LOCAL Carbon UNCCD But “Pratices” should be highlighted!
  10. 10. Managing soil carbon through agro-ecological practices:a win-win strategy attending both global (fight against climate change) and local problems (soil degradation) This presentation was build upon ideas and exchanges from numerous colleagues and results from research programs, in particular: http://www.csf-desertification.org/ http://www.rime-pampa.net/ Une Réponse Intégrée Multi-Équipes au Programme d’Appui Multi Pays pour l’Agro-écologie Le Comité Scientifique Français de la Désertification French Scientific Committee on Desertification CaSA Réseau « Carbone des Sols pour une agriculture durable en Afrique »Sociétés Rurales, Environnement, Climat en Afrique de lOuest Network “Soil Carbon for a Sustainable agriculture in Africa” Rural Societies, Environment, Climate in West Africa Rede “Carbono dos Solos para uma agricultura Sustentável na Africa” http://www.ppr-srec.ird.fr/ http://www.reseau-carbone-sol-afrique.org/
  11. 11. Managing soil carbon through agro-ecological practices:a win-win strategy attending both global (fight against climate change) and local problems (soil degradation) Full report will be soon available on line at http://www.csf-desertification.org/
  12. 12. Managing soil carbon through agro-ecological practices:a win-win strategy attending both global (fight against climate change) and local problems (soil degradation) http://www.soilcarbon.org.uk

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