Socio-ecological resilience to soil erosion in East-Africa ... Wynant… · –Poverty and...
Transcript of Socio-ecological resilience to soil erosion in East-Africa ... Wynant… · –Poverty and...
Socio-ecological resilience to soil erosion in East-Africa:
an interdisciplinary approach
Maarten Wynants, William H. Blake, Anna Rabinovich, Claire Kelly, Kelvin Mtei, Linus Munishi, Mona
Nasseri, Aloyce Patrick, David Gilvear, Neil Roberts, Geoff Wilson, Patrick Ndakidemi
email: [email protected]
Soil erosion, the FWE nexus and SDG challenges in East Africa
Interdisciplinary approach to ‘wicked problem’ of soil erosion
Funded by UKRI GCRF (2016-2017)
& NERC [Follow On] (2017-2019)
• Natural high vulnerability due to distinct topography, semi-arid climate, disequilibrium vegetation and fragile soils.
• Indigenous systems of intercropping, shifting cultivation, nomadic pastoralism co-evolved with and adapted to local environment.
• Colonial alteration to human-environment relationships within western systems of market-led agricultural and resource management. Displacement, coercion, marginalisation and exclusion of local communities enforced from centralised power structure
• Post-independence nation-states build on colonial borders and principles of modernity. Continuing same processes but with different political justifications. African socialism, liberalisation and globalisation
• Current social economic and political drivers of soil erosion:– Poverty and population increase => Malthusian trap? Why no escape?
– Governance and political representation
– Land rights and access
– Limited access to the market, services and modern capital
Wynants et al. 2018- In prep.
Land degradation in East-Africa: a complex timeline of disruption
Assessing soil vulnerability
to erosion past and present
Exploring socio-
cultural drivers and
challenges
Sedimentary evidence of
baselines and rates of change
Lake Manyara catchmentSubcatchment Sediment contribution (%)
Dudumera (f) 8
Endabash (h) 7.6
Kirurumo (b) 5.3
Makuyuni (d) 59.3
Mto Wa Mbu (c) 7.4
Simba (c) 5.3
Tarangire (e) 7.2
Pinpointing areas of increased soil erosion risk following land cover change (1988-2016)
Wynants et al. 2018- Int J Appl Earth Obs Geoinf 71: 1-8
Loss of vegetation cover [drough, grazing, deforestation] exposes and weakens soil
Image: Blake
Reduced infiltration leads to OLF and sheet erosion
Photo: Carey Marks/University of Plymouth
OLF converges with natural topography and along trackways…
Photo: Carey Marks/University of Plymouth
Incision and gully network development increases connectivity
Photo: Carey Marks/University of Plymouth
socio-ecological system at a tipping point?
Applied environmental diagnostics tools: sedimentary evidence of landscape change
‘If we don’t change the environment may force us to change... and then it might be too late’
Enhanced runoff is a basin-wide problem
Photo: Carey Marks/University of Plymouth
Sediment is being washed to downstream ecosystems threatening
biodiversity, health, economy and livelihoods
Adding complexity to the problem….
But… ‘overgrazing’ and ‘land cover change’ are symptoms of wider environmental and social dynamics and transitions
Population growth
Sedentarisation/ migration
Changing rainfall patterns
Governance change
Shifts in land ownership
communities locked in?
Realising change: barriers and opportunities
Cultural importance of cattle & cattle as ‘savings account’
skills and knowledge to diversify or change livelihood?
Who takes responsibility for protecting common land?
Harmony in community versus environmental protection
Education is valued
Recognition that environment may
force change
Cohesive communities
Co-designing pathways to change through a shared community vision for the future
New tools to support behaviour change and policy co-design in 2018-19 With Carey Marks (designer)
“I’m glad that you have come to ask important things that are concerned about environmental degradation in this community. I’m very happy about your coming in this village because other researchers do come and after getting done with their activities they go and forget us without coming back.
So are you also same as them or there is a way that you are going to help us in saving our environment from soil erosion problems?”
Farmer, Emaerete
Meeting the community's challenge: impact ambitions 2018-2019
Knowledge exchange to elucidate community-led solutions
Co-design of village-specific byelawsDemonstration restoration plots
to catalyse behaviour change
The interdisciplinary Jali Ardhi [Care for the Land] Project
SEI