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Monitoring rangelands and pastoralists' trekking routes in the Afar, Ethiopia. Ben Sonneveld - Centre for World Food Studies of the VU University Amsterdam (SOW-VU) Kidane Georgis - GEOSAS, Ethiopia - PowerPoint PPT Presentation
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Monitoring rangelands and pastoralists' trekking routes
in the Afar, EthiopiaBen Sonneveld - Centre for World Food Studies of the VU
University Amsterdam (SOW-VU)Kidane Georgis - GEOSAS, EthiopiaFekadu Beyene - Institute of Pastoral and Agropastoral
Studies, Haramaya University (IPAS)
Sponsors: OPEC Fund for International Development Dutch Ministry of Foreign Affairs/Dev.
Coop. Haramaya University
Project Objectives
– Improve wellfare of pastoralist community – With special attention to the role of policy interventions:
Optimal geographical stratification of water pumps Price-weather insurance between pastoralists and traders
Approach – Create consolidated data base (biophysical/socio-economic)– Spatial welfare model
Node link network/monthly time steps Accounts for existing institutions on NRM
– Dialogue with stakeholders– Capacity building
Overview of presentation
Afar: institutions under pressure Intended contributions of the project Monitoring rangeland Monitoring trekking routes Further research
Afar: institutions under pressure Institutional Characteristics
– Open access of dryland resources– For about a 100 clans– No supervision– Regulations on land and water use– Jurisdiction by clans (Madaa)
A long time neglected area‘… many of these pastoarlists are
politically marginalized by national authorities….
Davis, 2006
An under-researched region‘… drylands require more attention of
scientists and researchersGeorgis, 2006
Pastoralism in the Afar
Livestock Nr of heads(in million)
Perc. national
Cattle 2 7
Sheep 2.3 11
Goats 4 37
Camels 0.8 80*
Mules/Horses 0.003 *
Source: CSA, 2003
Afar: institutions under pressure (2)
Shifting paradigms “Hardin vs Ostrom”
Economic theory on ‘open access resources’ indicates the absence of price structure for its use and lack of incentives for its custody. In short, the “Tragedy of the commons”(Hardin, 1964)
Yet,
Reality proofs that these open access resources are well managed without a clear and expensive supervision and that arrangements between its members has been the guarantee of a centuries-old sustainable livestock production system under harsh climatic conditions. (Ostrom, 1993)
Afar: institutions under pressure (3)Yet,
– ‘.. they [institutions] often fail when rapid change occurs or problems at a larger scale.’
(Dietz, Ostrom and Stern, 2003. ‘The struggle to govern the commons’, Science)
And,
– ‘…traditional institutions in pastoralist societies are increasingly challenged by new constraints; and do not always find appropriate answers,... (The Red Cross, 2009)
Afar: institutions under pressure (4)
This also holds for the Afar where several drivers are reducing access to water and land resources.
Like, Fast population growth Increasing encroachment of sedentary agriculture; Border regulations
And results in: Poverty Land degradation Water pollution Conflicts
Intended contributions of the project
Yet,
‘..promising new strategies emerge that address these problems by facilitating: dialogue, experimentation, learning, and change.’ Dietz, Ostrom and Stern (2003) ‘The struggle to govern the commons’,Science.
Our project aims to enhance institutions’ initiatives that address the new challenges that are faced by Afar pastoralists
Moreover, Project wants to address the rising need of the donor community to
provide a coherent information system for investments in drylands
Two monitoring systems
Monitoring – Rangeland quality in nomadic pastoralist
systems– Monitoring Tekking Routes of Nomadic
Pastoralists
Monitoring Rangeland Quality in Nomadic Pastoralist Systems
Approach: Confront spatial patterns of:
– Supply-Demand forage ratio (driver: overgrazing)
with– Rainfall Use Efficiency trends
(impact: land degradation) under– various Accessibility scenarios
(response: migration).
Rainfall, livestock density and forage demand
Figure 3. TLU density per woreda.
Grazing demand based on Boudet and Riviere (1968) and Minson and McDonald (1987): assuming livestock needs 2.5% of its body weight for a sustained growth.
Consumption of 6.25 kg of forage dry matter daily for each TLU.
Spatial forage production function 0 1 1 2 2max 0,y x x
β0 -573.32
β1-545.22
β2 9.26
*All parameters significant at 95% CL
**R-sq = 0.46
***Regression using annual rainfall for scenario APC
Supply demand ratio for forage by woreda, zone and region
Supply demand ratio for forage by a) woreda, b) zone, c) state.Supply demand ratio for forage by a) woreda, b) zone, c) state.
RUE analysis: linear regressionRUE
0
0.005
0.01
0.015
0.02
0.025
0.03
0.035
0 5 10 15 20
Years
Y=-0.00035X+0.0269 r2=0. 65 t=0.15
Monitoring Livestock Production and Land Degradation in Nomadic Pastoralist Systems
Conclusion– Supply/demand improves at higher spatial aggregation
levels– Supply/demand ratio at Afar state level is more or less 1. – Degradation absent except for some pockets near
mountains and in Northern part– Much of the findings rely on accessibility scenarios
Further research– Need for more detailed information about trekking routes
under various climatic conditions
Monitoring Tekking Routes of Nomadic Pastoralists
Problem Absence of detailed information on nomadic
trekking routes and decision making aboute migration patterns
Personal following of herds– Difficult, dangerous and expensive– herder will select routes that guarantee safety of
observer
Pilot studie
Objective Testing of ‘remote tracking’ systeem
– Analysis of herd movements without the presence of external observer
– Correlation between migration patterns and available satellite information: NDVI
Remote tracking: how does it work
• ‘Beacon’ transmits GPS signal to satellite• Satellite transmits coordinates to ground radar• From radar to central unit• From central unit to client
Visualisation of migration patterns in e ‘Google Earth’
The herder
Selection by local counterpart District Ayssaita, Stad Mamulei Herd: 5 camels, 35 cattle,
25 goats, 10 sheep Monitoring: 30 October-10 December, 2007 Dry spell
NDVI data
Normalized Difference Vegetation Index: ‘Greenings Index’
10-day averages 1 X 1 km VITO Belgium
RESULTS
Trekking routes Relation visited pixels and NDVI
Figure: Phase diagram dynamic herd movements
Thickness line segments: time between observations
Crossing lines: homestead
• During mornings slow movements to rangeland and watering pints; afternoons rapid return to home stead
average max minSpeed (km/hr) 1.2 4.6 0.01
Distance (km) 9.3 38.9 <1
Figure: Frequency NDVI classes study area. X-as: NDVI classesBlue-grey: all pixelsBrown: pixels visited by herder
• Distribution visited pixels middle-high NDVI values: rangeland
• Highest NDVI values avoided; perennial vegetation• Lowest NDVI values avoided: bare land
Hypotheses (Scanlon et al., 2005)
Three archetypes visible from NDVI response on rainfall– Rangeland: high variation in NDVI values– Perennial vegetaion: high NDVI values low variation– Bare land: low NDVI values without variation
Figure: NDVI values and grazing intensies over time.
Grazing intensities (number of visits): Blauw: Intensive (>20) Groen: High (5-20) Rood: Moderate (1-4) Zwart: Low (0)
• High variation of NDVI values: rangeland• High NDVI data low variation: perennial vegetation• Low NDVI data no variation: bare land
Startrainfall
Dry spell
Conclusions Pilot with ‘remote tracking’ successful Dedicated software for processing NDVI data and migration patterns improvements:
– Smaller beacons– Battery with solar energy as used by bird ‘tracking’
Herd has a potential range of 40 km per day Water most important reason for migration Morning slow movements for grazing; afternoon rapid return to
homestead
NDVI-variation as indicator for vegetation composition
Further research Expansion of pilot to obtain regional information on nomadic trekking
routes Remote sensing information combining with interviews. Vegetation compositioin per pixel: rainfall response ‘Groundtruthing’ NDVI information Rangeland production assessment from satelite data and vegetation
samples
Opportunities – Determine corridors – Management of water pumps– Rangeland improvement– Possibilities for export markets