linking soil biodiversity, water regulation and agricultural
DESCRIPTION
Yoro Sidibe from the International Water Management Institute, Ghana talks aboutTRANSCRIPT
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A water-secure world
Linking soil biodiversity, water regulation and agricultural production: a conceptual framework
Yoro SidibeInternational Water Management Institute
Sebastien Foudi (BC3), Unai Pascual (BC3), Mette Termansen (Aarhus University)
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A water-secure world
Outline of the talk
Motivation
Problem
Result
Policy recommendations and Conclusions
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A water-secure world
Motivation
Water management
Increase Agricultural production
Reduce productive Risks
Construct a more resilient agricultural system. Resilience viewed “as the capacity to absorb extreme events”. Alleviate poverty Increase agricultural income Improve food security
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A water-secure world
Motivation
Management of water through large infrastructures:Dams, Canals, Pumping stations, Etc.
Very often failure because of- High costs- Managerial difficulties- No control of smallholder farmers- Environmental impacts
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A water-secure world
Motivation
Idea: look into alternative sustainable and resilient solutions
These alternatives solutions do not need to conflict with large scale infrastructures but complement and optimize their use.
EcoFinder project + Africa RISING project :What role can soil biodiversity play in agricultural production? What soil biodiversity conservation strategy in a changing climate?
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A water-secure world
Problem
Is it possible to conceptually show the role and value of soil biodiversity (through soil water regulation)?
What value does soil biodiversity have (production and insurance) ?
How to adaptively use soil biodiversity to climate change?
Questions answered with a simple modeling approach
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A water-secure world
Problem
Climate Soil Biodiversity Production Economy
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A water-secure world
Problem
Biodiversity rich soil
Biodiversity poor soil
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A water-secure world
ProblemThe model
Economics
Climate Bio-Soil Water Crop
Assumption Variable rainfall Biodiversity shape soil
Water dynamics depends on soil
Production depend on water
Model
Economic Assumption
Rational farmer ( Risk averse)
Economic Model
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A water-secure world
ResultsWhat is the impact of soil biodiversity on average production ? (productive value)
0 1 2 3 4 5 6 7 8 9 100
1
2
3
4
5
6
7
8
Production
Production
Soil Biodiversity
Aver
age
prod
uctio
n
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A water-secure world
ResultsWhat is the impact of soil biodiversity on average production ? (productive value)
0 1 2 3 4 5 6 7 8 9 100
1
2
3
4
5
6
7
8
Production
Production
Soil Biodiversity
Aver
age
prod
uctio
n
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A water-secure world
ResultsWhat is the impact of soil biodiversity on average production ? (productive value)
Soil biodiversity has a production value
For areas with poor soil, a small increase in soil biodiversity can result in large increases in agricultural production
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A water-secure world
ResultsWhat is the impact of soil biodiversity on production variance ? (insurance value)
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A water-secure world
ResultsWhat is the impact of soil biodiversity on production variance ? (insurance value)
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A water-secure world
ResultsWhat is the impact of soil biodiversity on production variance ? (insurance value)
Soil biodiversity has a an insurance value up to a certain level.
For areas with poor soil, a small increase in soil biodiversity can result in large decreases in agricultural production variability.
Soil biodiversity can be important in protecting against risks in areas with poor agricultural insurance services.
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A water-secure world
ResultsWhat is the optimal biodiversity decision of a rational farmer?
Farmers growing crops with high water productivity are more likely to rely on soil biodiversity for its productive use.
Farmers growing crops with low water productivity are more likely to rely on soil biodiversity for its productive and insurance use.
Solution
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A water-secure world
ResultsWhat is the effect of climate change on biodiversity conservation strategy?
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
5
10
15
20
25
30
35
40
45
50
λ=0λ=0,01λ=0,03λ=0,05
Drought frequency
Soil
Biod
iver
sity
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A water-secure world
Policy recommendations and Conclusions
Promote on land soil management (through biodiversity) as a significant alternative way to manage water.
Promote soil biodiversity management as risk management tool in areas with poor insurance services.
Modulate the intervention strategies according to exogenous factors (climate, soil, risk aversion) etc.
Empirical investigation is still to be done to provide quantitative recommendations beyond the qualitative results presented here.
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A water-secure world
Thank you for your attention