agroforestry: a productivity and resilience booster · –66% of global land use –75% of global...
TRANSCRIPT
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Agroforestry: a productivity and resilience booster
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2
Who are we?
• One of the 15 CGIAR research centres
• employing about 500 scientists and other staff.
• We generate knowledge about the diverse roles that trees play in agricultural landscapes
• We use this research to advance policies and practices that benefit the poor and the environment.
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Our HQ & regional research nodes
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Four Research Themes
1. Greening Tree Crop Landscapes – Improving Governance of Tree Crop Landscapes for Resilient
Green Economies, Climate...
2. Tree Productivity and Diversity
– Realising economic and ecological value from trees
3. Land Health Decisions
– Land Health Evaluation, Restoration and Investment Decisions
4. Resilient Livelihood Systems
– Resilient productivity and profitability of agricultural systems with trees
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The agriculture challenge: “by 2050, we need to…
• Double world food production on ~ the same amount of land
• Make farms, fields and landscapes more resistant to extreme weather, while…
• … massively reducing GHG emissions.”
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Agriculture: the silent giant
• Agriculture & forestry is only 4.8 % of global GDP
• But…
– 30% of global GHG emissions
– 50% of global employment
– 66% of global land use
– 75% of global freshwater use!
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Trees outside forests, on farms
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Human population density
Global population density
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There’s a reason for that. Trees work.
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Agroforestry is universal
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Nicaragua: coffee, timber
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Portugal: livestock, cork
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Russia & central Asia: wheat, timber, silk…
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Uganda: banana, coffee, vanilla
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Liagre F., personal communication
France: wheat, timber
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Sri Lanka: coconut, woodfuel
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Arctic taiga: meat, timber, wood pellets
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Zambia: maize, F. Albida
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Why?
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Nutrient cycling
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Light intercepted :
Walnut : 0.73 Wheat : 0.66
0 10 20 30 40
020
40
60
80
100
Agriculture
Walnut Wheat Not used
Year 0 10 20 30 40
020
40
60
80
100
0 10 20 30 40Forestry
0 10 20 30 40
020
40
60
80
100
Agroforestry
0 10 20 30 40
% of sunlight used by photosynthesis
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Water cycle buffering
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Drought protection of trees Forestry: most roots close to surface
Agroforestry: most roots at depth
Root density: meters of rootlets /m3 of soil Root density: meters of rootlets /m3 of soil
Dep
th (cm
)
Dep
th (cm
)
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Key concept: the Land Equivalency Ratio
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“The additive maize/cowpea intercropping option after cotton or maize resulted in an average overall LER of 1.47, no maize grain penalty, and 1.38 t ha−1 more cowpea fodder production compared with sole maize.”
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Willow alley cropping (Wakelyns, UK)
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Wakelyns’ bottom line
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160 Ha farm:
• Agroforestry: 62 Ha wheat
& walnut/wild cherry, 70-
90 trees Ha-1
• Forestry: 10 Ha walnut,
200 trees Ha-1
• Both planted 38 years ago
Poitou-Charente (France)
© agroof Liagre F., personal communication
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Poitou-Charente (France)
Impact on income:
• Woody biomass identical in AF and forest plots (2014)
• Wheat yield ~ identical in AF and conventional plots for first 25 years - except in drought years, when AF yield higher than conventional yield
• AF plots converted to hay pastures now (alleys too close).
• Timber harvest starting from 2014 value ~ 2,000,000 €
Impact on soil:
• Soil organic carbon in AF plot doubled in 25 years.
• Less erosion, higher water percolation in AF plot
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Zinder, Niger, 1980s
Sometimes, LERs much larger than 1
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Zinder, Niger, today.
These 5 million hectares of new agroforest
parklands are yielding
500,000 tonnes
more than before. (Reij, 2012)
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Oil Palm, Brazil
Oil palm + agroforestry experiment, Year 5, Tomé Açu, Pará, Brazil.
Photo: Debora Castellani
Conventional oil palm monocrop system
Andrew Miccolis, ICRAF Brazil
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Agroforestry Oil Palm
• Annual crops first 3-4 years (cassava, maize, short-cycle legumes)
• Fruit trees : cacao, açaí (euterpe oleracea), banana
• Timber, fertilizer trees
• Intense management, slash-and-mulch
• 3 x 6 ha plots planted in early 2008
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Densidade: UD1: 81 pl/hectare UD2 e Conv: 99 plantas/hectare
*
*
98%
125%
27%
14%
71%
149%
99%
49%
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
2011 2012 2013 2014
SAF Biodiverso UD1 SAF Biodiverso UD3
Pro
dução d
o D
endê (
ton/h
ecta
re)
PROJETO SAF DENDÊ Produtividade de Dendê
Resultado esperado
t/h
a (F
FB)
Year 4 (2011) Year 5 (2012) Year 6 (2013) Year 7 (2014)
Castellani et al 2014, Internal Report
Oil palm agroforestry Plot 1 (81 pl/ha)
)
Oil palm agroforestry Plot 2 (99 pl/ha)
Monocrop oil palm* (considering 99 pl/ha)
*Average yields at the same age in the same region according to Perez et al. 2007 Viabilidade de extracao de oleo de dende no Estado do Para. Vicosa, UFV. 2007. http://portal.mda.gov.br/portal/saf/arquivos/view/biodisel/18_-_Dende.pdf
Agroforestry vs. monocrop: knockout
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Climate change
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Ag and LULUCF emissions: huge
IPCC AR4 GHG emissions by sector in 2004 [Figure 1.3b].
5) Including agricultural waste burning and savannah burning (non-CO2). CO2 emissions and/or removals from agricultural soils are not estimated in this database. 6) Data include CO2 emissions from deforestation, CO2 emissions from decay (decomposition) of above-ground biomass that remains after logging and deforestation, and CO2 from peat fires and decay of drained peat soils. Chapter 9 reports emissions from deforestation only.
30.9%
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Exported carbon
(t/ha/yr)
Carbon restituted to soil (t/ha/yr)
2
2
4
4
6
6
0
"Modern" agriculure (1 crop a year)
7 tC/ha/yr Intermediate cover crops (2-3 crops a year)
12.5 tC/ha/yr
Intermediate cover crops + agroforestry
16.5 tC/ha/yr
Food production
Soil restitution (fertility)
Biofuels
(fuelwood, anaerobic digestion…)
Storage in biomass (timber)
de construction…)
Carbon, fertility... and climate
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European agroforestry’s potential amounts to 1/3rd of European Union emissions!
Huge mitigation potential
EU-28 total emissions (excl. LULUCF), mln T CO2-eq.
Source: European Environmental Agency
Aertsens et al. estimate: 1400 mln T/year
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Adaptation
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Natural catastrophes, trend
Munich Re (2011)
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43
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Agroforestry and wind resistance
Storm Klaus January 2009
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Why? Deeper rootstock; thicker stems Forestry: most roots close to surface
Agroforestry: most roots at depth
Root density: meters of rootlets /m3 of soil Root density: meters of rootlets /m3 of soil
Dep
th (cm
)
Dep
th (cm
)
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Environmental services
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Source : INRA Restinclières, France
Agriculture Agroforestry Forestry
Average nitrate leaching K
g / h
a / Y
r
Reduced nitrogen leaching
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Soil biota density under crops and agroforestry (Barrios et al 2012)
Nu
mb
er
per
m2
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Natural resources
Inputs
Outputs
The present is win-lose
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Natural resources
Inputs
Outputs
The future can be win-win.
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… why does the world tend to this?
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Natural
Forest
4.1 billion ha
Crop
Land
1.5 billion ha
Pasture &
Rangelands
3.4 billion ha
Wetlands
1.3 billion ha
Deserts
1.9 billion ha
Planted
forests
We organise like this… … but the world looks like this.
Our institutions can’t handle complexity very well.
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Cultural issues: this looks like a healthy field but (probably) isn’t…
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…this looks like a mess but (probably) is a healthy field.
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Futurism! Modernity! Begone, old ways!
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Tractors, not plants!
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Investment in
conventional agriculture
research
Investment in agroecological research
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Agrobusiness cashflow:
regular sale of inputs
Agroecology cashflow: some consultancy
It’s a cashflow issue
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Which leads to
Agroecology marketing budget
Agroecology research budget
Agroecology Political influence
Agrobusiness marketing
Agrobusiness research Agrobusiness
influence
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Diversification
Agroecological approaches
Ecological Farming
FMNR
Sustainable intensification
Climate Smart Agriculture
Organic Farming
Permaculture Holistic Grazing Management
Farming Gods Way
Conservation Agriculture
EverGreen Agriculture
Agroforestry
Restorative Agriculture
Intercropping
Fertiliser Tree Technology
IPM Push-Pull
Perenialisation
CAWT
Restoration Agriculture
Ecological agriculture
Forest Landscape Restoration
Biodynamic agriculture
Syntropic agriculture
3D Farming
Climate Resilient Zero Budget
Natural Farming
Green manure
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