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Gebrekirstos A., Njoroge J, Abayneh Derero, Kiros Hadgu, Jeremias Mowo and Fergus
Sinclair
Enhancing food security through agroforestry practices: Key lessons from the ‘trees for food security’ project in Ethiopia
Presentation outline
1. Can trees plan a role in addressing
challenges of food security?
Food security challenges
2. Is there complementarity in water use in agroforestry systems?
4. To what extent can findings be scaled up
BofaMojo
Alem TenaMekiZeway
TibeAnoUke
Arjo
Addis Abeba
Can trees play a role in addressing challenges of food security
• Trees scattered on farm as a dominant feature of agricultural landscapes in Ethiopia,
• Enormous knowledge gap on multi-dimensional roles of trees for food security on farm patterns, this could contribute to guiding interventions to promote tree cover and diversity at farm/ landscape level
- -
- -
Other roles products and servicesOlder than 3 years old trees on farm (multiple answers)
firewood fodder shadefruit timber
charcoal
Higher crop (wheat) productivity under
Faidherbia- Ethiopia
Source CIMMYT
40
41
42
43
44
Tree + Wheat Sole wheat
Nu
mb
er
of
seed
s p
er s
pik
e)
0
1
2
3
4
5
6
7
8
9
Tree + Wheat Sole wheat
Sto
ver
yiel
d (
t h
a-1)
0
0.5
1
1.5
2
2.5
3
Tree + Wheat Sole Wheat
Gra
in y
ield
(kg
ha-1
)
Higher Food Consumption Score (FCS)on farms with trees in Melkassa but not Bako
More livestock on farms with
trees in Bakobut not
Melkassa.
Greater diversity of farm produce on farms with trees in both Melkassa and Bako
Trees on farms are associated with higher food security
10
15
20
25
30
35
40
0 2 4 6 8 10 12 14 16 18 20 22 24
Air
te
mp
era
ture
(°C
)
Time of the day (h)
Outside canopy Under canopy
Never exceeds 28°C
Up to 7°C
difference
Keeping wheat cool at anthesis
Source CIMMYT
Can agroforestry increase water available to crops?
• The water use of different tree species vary (between sites, provenances, between seasons etc.)
• Management has impact on tree water use and hence interaction with crops
• Preliminary observations in Faidherbia abida higher rates of sap flow of 4 litres per hour (59litres per day) in unprunnedtrees in Ethiopia
• In Nairobi the rates in a mature unmanaged tree ranged from 14-34 litres per hour in the rainy and dry season respectively
Sap flow and Hydraulic redistribution in Faidherbia ongoing work Muthuri et al
Management has an effect on water use, Sap flow in pruned Faidherbia
Because of its reverse phenology do we expect depletion in d 18 O towards dry season
Intra-annual variation of δ18O values F. albida showed depleted values at the beginning of the growing season (marked red), despite the marked differences between years (indicating source water differences with in a year)