agricultural systems and ecosystem services: trade-offs or...
TRANSCRIPT
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Agricultural systems and ecosystem services: trade-offs or synergies?
• Agricultural systems are managed by farmers and influenced by local, national, and international policies and markets
• Ecosystem services flow to and from agricultural systems
• Configuration of agricultural landscapes influences ecosystem services
• Ecosystem services affect food security in complex ways
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Source: www.epa.gov/emap/gif/dataI/agro.gif
Proportion of Land in Agriculture
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Ecosystem Services and Agriculture
(Zhang et al. 2007)
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Diversity of Agricultural Systems
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Threats to Ecosystem Services
• Provisioning services influenced by: – Loss of biodiversity (pollinators, enemies)
– Invasive species (pests, pathogens, weeds)
– Climate change
– Global markets
• Other ecosystem services influenced by: – All of the above
– Impacts of agricultural practices
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Landscape Configuration and Ecosystem Services
• Agroecosystems sit in a landscape, a matrix of land uses
• Ecosystem services to and from agriculture are influenced by the surrounding landscape
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Landscape Configuration and Pest Control in Maize
NY Corn Regions
high corn
low corn
0 50 km
Regional scale: 20km radius
Local scale: 1 km radius
Neighborhood: field perimeter
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Western corn rootworm (Diabrotica virgifera)
Regional: County
0
5
10
15
20
25
30
high corn low corn
WC
R c
ard
-1 c
ou
nty
-1
Local: 1km
0
20
40
60
80
100
120
0 20 40 60 80
% corn within 1km
WC
R s
tic
ky
ca
rd
-1
fie
ld-1
Local: Perimeter
0
20
40
60
80
100
120
0 20 40 60 80 100
% perimeter in corn
P < .001 P < .001 NS
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Predatory Beetle Coleomegilla maculata
Regional: County
0
2
4
6
8
10
12
high corn low corn
C. m
ac
ca
rd
-1 c
ou
nty
-1
Local: 1km
0
5
10
15
20
25
0 20 40 60 80
% corn within 1km
C. m
ac
sti
ck
y c
ard
-1
fie
ld-1
Local: Perimeter
0
5
10
15
20
25
0 20 40 60 80 100
% perimeter in corn
P < 0.05 P < 0.05 P < 0.05
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Landscape Configuration and Ecosystem Services
“Land sparing” agriculture:
coarse grain, abrupt change
“Wildlife-friendly” agriculture:
fine grain, spatial continuity
(Fischer et al. 2008)
Tradeoff model Synergy model
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Methods for Increasing Productivity
• Optimization of current practices
– Crop improvement (breeding)
– Integrated pest management
– Integrated nutrient management
• Input substitution
– Nitrogen fixing cover crops
– Biological control or biopesticides
• System redesign
– Planned and unplanned diversity
– Syndromes of production
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Syndromes of Production
• A set of management practices that are mutually adaptive and lead to high performance
• Practices might include:
– crop and varietal selection
– planting density
– fertility source and quantity
– management of insects, diseases and weeds
– water management
Syndrome 1
Syndrome 2
Management Practice 1
Man
ag
emen
t P
ract
ice
2
Andow & Hidaka 1989
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Change in crop yield with intervention, based on 360 yield comparisons in 198 projects in 57 countries (Pretty et al. 2006)
Impacts of Development Projects
Projects based on: •Integrated pest management •Integrated nutrient management •Conservation tillage •Agroforestry •Water harvesting •Livestock integration
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Private sector investment in agricultural research
Commercial Transition Subsistence
Crop
improvement Medium Low Zero
Crop
management Low Zero Zero
Resource
management Zero Zero Zero
(Source: Pingali 2001)
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Tradeoffs, Synergies and Food Security
Agricultural
productivity
Utilization of food
Intensification
Sustainable options +
Access to food
+
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Agricultural systems and ecosystem services: trade-offs or synergies?
• Agricultural systems are managed by farmers and influenced by local, national, and international policies and markets
• Ecosystem services flow to and from agricultural systems
• Configuration of agricultural landscapes influences ecosystem services
• Ecosystem services interact with food security in multiple ways
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Diversity of Agricultural Systems
• Low diversity • Annual crops • Frequent disturbance • Low nutrient retention • High subsidies
• Moderate to high diversity • Annuals & perennials • Infrequent disturbance • High nutrient retention • Low subsidies
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Maximum Diversity
Tropical rain forest
Temperate forest
Natural grasslands
Boreal Forests
Spartina marshes
Geothermal pools
Shifting cultivation in humid forests
Home gardens
Polycultures
Genetic mixtures
Wheat varieties
Maize hybrids
Minimum Diversity
Natural Ecosystems
(Adapted from Francis 1981)
Traditional plantations
Agricultural Ecosystems