Development of a SOC Baseline:Experiences from Otjozondjupa, Namibia
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1) Researchers in Namibia developed a soil organic carbon (SOC) baseline for the Otjozondjupa region using various digital soil mapping methods and 237 soil samples. 2) The SOC baseline showed that areas converting from grassland to bush encroachment had lower SOC, while areas converting from bush to grassland had higher SOC. 3) Stakeholder engagement and understanding the socio-economic drivers of land use change, especially the transition to self-governance, are important for developing a relevant SOC baseline and achieving soil carbon sequestration goals.
Development of a SOC Baseline:Experiences from Otjozondjupa, Namibia
- 1. Development of a SOC Baseline: Experiences from Otjozondjupa, Namibia Ravic Nijbroek, Bas Kempen, John Mutua, Mats Soderstrom, Kristin Piikki, Simeon Hengari and Amon Andreas Global Symposium on Soil Organic Carbon Rome, Italy March 22, 2017
- 2. Themes Situating the Problem developing the baseline Contextualizing SOC making the baseline relevant
- 3. Scientific Conceptual Framework for Land Degradation Neutrality (UNCCD Science Policy Interface) Source: Orr and Cowie, 2017 LDN Indicators: Land Cover (land cover change) Land Productivity (net primary productivity) Carbon Stocks (soil organic carbon) Bush Encroachment (bush density)
- 5. Otjozondjupa Area: 105,000 km2 Population: 142,000 people Average Precipitation: ~450 mm yr-1 Synthesis Report of Methodologies for LDN Baseline Mapping (2016) Soils for Landscapes and Sustainability (CIAT) and Geosciences Lab (ICRAF)
- 9. Digital Soil Mapping Method Complexity Inverse Distance Weighting (IDW) Medium Kriging Medium-High Regression Kriging with SoilGrids High Regression Kriging with small covariate stack High Random Forest with large covariate stack Very High
- 10. Sample Locations Target: 325 Reached: 237 Usable profiles: 219
- 11. Contextualizing the SOC Baseline
- 12. 1. “ … we know the criteria for MRV.” – Martial Bernaux • Consistency • Completeness • Accuracy • Transparency • Comparability Local Concerns: 1. LDN must be locally owned including data collection, data analysis, and baseline production. 2. LDN must be integrated with ongoing policies and activities. Contextualizing the SOC Baseline
- 13. 2. “ … the approach embraces integrated landuse planning.” – Barron Orr Two ongoing national projects and policies: 1. Integrated Regional Landuse Planning (IRLUP) 2. Debushing Program Contextualizing the SOC Baseline
- 16. Land cover change type 2000 to 2016 Total SOC stock (kg) Average SOC stock (kg/m2) Bush land to Grassland 224,835 1.59 Grassland to Bush land 152,676 1.28 Grassland to Grassland 55,817 1.67 Furthermore, areas that are becoming bush encroached – typified by high density of bushes that are less than 1.5 m tall – are negatively correlated with SOC.
- 17. We have Land Cover, what about Land Use?
- 20. Contextualizing the SOC Baseline 3. “Socio-economics was the main driver” - Johan Six
- 21. “… until a theoretical explanation – based on human choice – for self-organized and self-governed enterprises is fully developed and accepted, major policy decisions will continue to be undertaken with a presumption that individuals cannot organize themselves and always need to be organized by external authorities.” ― Elinor Ostrom, Governing the Commons, p.25
- 22. Section 6.7.5: The role of stakeholder engagement • “For any LDN project to be effective, governments must develop: • inclusive, • participatory consultation • and outreach programmes • to engage stakeholders • in the co-production of knowledge • and mutual learning • at both the national and local levels, … accomplished through • the establishment or leveraging of multi-stakeholder platforms • at each relevant scale, • with established links across scales” (p. 67)
- 23. Conclusions • We have enough tools to develop SOC baselines • Build on existing freely available data such as SoilGrids • Contextualize SOC - make the data relevant! Understanding how farmers and communities transition to self-governance (as opposed to centralized control and management) requires more attention by the SOC community in order to achieve soil carbon sequestration.
- 24. “Time is the natural resource in shortest supply.” ― Elinor Ostrom