tree-based agroforestry systems - gwdgcetsaf/agroforestry/afintro_rationale2007.pdf · not...
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Tree-Based Agroforestry Systems Summer term 2007, rationale (June 17th)
Course Credit: 1 SWS (1.5 credits ECTS) within the Module Forest Protection & Agroforestry
Examination: Written, date 15. Aug. 2007
Lecture by: Dr. Uwe MuussCentre for Tropical and Subtropical Agriculture and Forestry (CeTSAF)Büsgenweg 137077 Göttingen, GermanyEmail: [email protected]
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Global indicators 1950 2000 IncreasePopulation (billion) 2.5 6.1 > doubleEconomy (trillion $, 2001)
7 46 > seven-fold
Grain production (million tons)
640 1855 ~ Tripled
Area under cultivation(million ha)
603 660 9.5%(accounts for 30% of total increase)
Grain yield (Mg/ha) 1.06 2.79 160%
Agricultural Production, 1950 – 2000
Source: P.K. Nair, 2006
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World Cereal Production, 1961 - 2004
0
500
1000
1500
2000
2500
1960 1970 1980 1990 2000 2010
Mill
ion
Met
ric T
ons
Total Production 1961 - 2004 0
100
200
300
400
500
1960 1970 1980 1990 2000 2010
Met
ric to
ns p
er c
apita
Per Capita Production 1961 - 2004
0.0
1.0
2.0
3.0
4.0
1960 1970 1980 1990 2000 2010
Met
ric to
ns p
er h
ecta
re
Total Yield Per Hectare 1961 - 2004 500
600
700
800
1960 1970 1980 1990 2000 2010
Mill
ion
hect
ares
Total Area Harvested 1961 - 2004
Source: FAOSTAT data, 2005.
Per Capita Production
Total area Harvested
Total Production
Total Yield per Hectare
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Areas Saved through Improved Technology – World Cereal Production (Borlaug)
Source: http://www.usda.gov/oce/forum/speeches/borlaug.pdf
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World fertilizer use, 1950-99
Pesticide use in the world and the US
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Degraded land in developing nations = ca 2.0 billion ha, 1/3 of total farmland
�Water erosion = 56%�Wind erosion = 28% �Physical deterioration = 12% �Chemical deterioration = 4%
High soil salinity levels in ~ a billion ha (7% of total land); an estimated 3 ha of land is becoming non-productive every minute because of salinity.
Degradation is slight in 38% of these lands, 40% are moderate, 15% severe, and 0.5% extreme.
Soil Degradation in Developing Countries
Source: Adapted from Scherr (1999)
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Current situations are alarming in many countries of Africa and Asia
Pictures: PK Nair
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Agriculture has a Vast Impact on the Earth
� Over two-thirds of human water use is for agriculture
� Crop and livestock production is the main source of water pollution by nitrates, phosphates and pesticides
� Agriculture, forestry and fishing are the leading causes of loss of the world's biodiversity
� Agriculture affects the basis for its own future through land degradation, salinization, the overextraction of water and reduction of genetic diversity
� The long-term consequences are difficult to quantify.
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Is it great progress?
– But to succeed – farmers have to get bigger• UK: 200,000 farms lost in 50 yrs (11/day)• USA: 4 million farms lost in 50 yrs (219/day)
Modern industrialised farming looks good because it measures its own success narrowly - and ignores the costly side-effects
Source: PK Nair 2006
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Food Production Per Person (1961 = 100) 1961 - 2000
60
80
100
120
140
160
180
200
220
240
1960 1965 1970 1975 1980 1985 1990 1995 2000
Asia (developing)
Latin America and the Caribbean
Sub-Saharan Africa (excluding South Africa)
World
Food Production Per Person. Source: FAO, 2000 (modified).
Getting Hungrier?
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The Gap is Widening
• In 1960 average per capita income in industrialized nations was nine times the average of Sub- Saharan Africa
• Today it is 18 times
Difference in magnitude
0
5
10
15
20
1960 2000
Sub-Saharan AfricaIndustrialized Nations
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GLOBAL FORESTS:
Tragedy of the Commons?
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World Forest Distribution
40.0%29.1%
10.9%
20.0%
Tropical Forest
Temperate Forest
Temperate Woodlands
Tropical Woodlands
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Global Forest Area: Past and Present
Adapted from FAO: http://www.un.org/esa/population/publications/wpm/wpm2001.pdf
6511178Oceania3227826Excl. Russia
58427323Europe67395720L A C 78455819N. America
28144931Asia
3482330Africa
542648130World
% of original forest
% of land area
% of land area
Land area (mill. km2)
Total remaining forestOriginal forest
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Are
a un
der
fore
st (R
elat
ive)
Time
Unlimitedresource
No danger ofdepletion
Someclearancewelcomed
Reduction inarea Voices for
conservation Legislation,govt. action
Pattern of Forest Utilization in Time
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1960 1970 1980 1990 2000
Exploitation
Plantations
Social Input
Agroforestry
CommunityForestry
Social Forestry
Urban Forestry
Environmentalconcerns
Climate Change
Biodiversity
NTFP
HabitatProtection
Tropical Forestry:Issues, Initiatives, Paradigms
? ? ?
Forest/timberCertification
Ecotourism
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For most policy makers, forest means timber
But forest and forestry mean much more than that …
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Global Forest Goods and ServicesCommodities and Products
TimberFuelIndustrial products
Non-timberEdible plants, nuts, etc.Medicinal productsFloral productsAnimal productsOther fiber productsForage
ServicesEnvironmental
LocalSoil protectionWater qualityGenetic and biotic
ConservationPollution bufferingGlobalCarbon storageGenetic & biotic cons.
Leisure and other Outdoor recreationAestheticsOther intangibles
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Plantation Forests
A forest raised artificially � Usually of a regular shape� Intensively managed� No. of species less, often one� Biologically less complex, but
economically more attractive� Only 5 % of world’s forest, but provides
about 50% of the world's wood
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Teak (Tectona grandis) in southeast Asia
Sal (Shorea robusta) in India
Eucalyptus in Brazil
Plantations: a major form of forestry development
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Cryptomeria pix from Kitayamasugi taken from web
sites, addresses sent by Maasaki Yamada
Japanese cedar, Cryptomeria japonica: Perhaps the highest intensity silvicultural operation in the world
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HIGH INTENSITY FORESTRY, Dehra Dun, India
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Tropical Forestry:The Conservation / Production Dilemma
Forests in wilderness
areas
Conservation reserveforests
Managed old growth forests
Intensively managedregrowth forests
Plantation andfarm forestsC
onse
rvat
ion
Valu
e
Production Value
Max
. ----
Mgt
. ----
Min
.in
tens
ity
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Fuelwood
More than 50 % of the wood produced globally is used as firewood/charcoal
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“Small timber”: not a part of global trade
Zimbabwe Haiti
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Fodder
Cattle, an asset in many societies, are supported by tree fodder
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Disturbance, conversion, or destruction
Rates:� 1850-1980: 15%, globally� Currently, tropical deforestation (15 million
ha/yr; 1%) is a matter of great concern
Deforestation
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Sustainability …
� not compromising future generations’ needs
� balance between ecology, economics, social justice
Many modern land-use systems of agriculture and forestry do not meet the sustainability criteria
Furthermore, high-input land-use systems have bypassed resource-poor conditions and ignored multiple benefits of traditional land-use systems
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“The significant problems we face today cannot be solved at the
same level of thinking we were at when we created
them.”
The Way Ahead
Albert Einstein
TIME’s Person of the Century
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AGROFORESTRYAn interface between
agriculture and forestry
… the purposeful growing of trees and crops and/or animals in interacting combinations for a variety of objectives.
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Nair, 1984.
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“Miracle trees” are grown on
farmlands, Africa.
Faidherbia albida in crop fields in West African
drylands
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Intercropping: Acacia trees and rice + sesame; India
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The Taungya System: Eucalyptus and rice; Thailand
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Integrated multi-species land-use systems; Kerala, India
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Homegardens: the epitome of sustainability
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Tree fruits are a significant source of food and nutritional security
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Bahia, Brazil: traditional land-use systems are a way of life in many societies
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Shaded perennial system: coffee under shade; Costa Rica
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Sun vs. Shade-grown CoffeeShade Sun
Av. yield (kg ha-1) 800 1200Plants/ha 1000 – 2000 > 2000Lifetime (yr) 25 – 30 12 – 15 Flavor (bitter) Less MoreProducers Small holders Large-scale# Bird species 150 20 – 50 Mid-size mammals 24 Almost noneOther species Abundant LessAgro-chemical use None or less HigherIrrigation Lower HigherSoil deterioration None/Lower Higher
http://www.ems.org/shade_grown/facts.html
Coffee~ 3300 cupsconsumedper second worldwide;US 33%.
The second most widely tradedcommodity(next to oil).
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A multistrata system of peach palm (Bactris gasipaes), black pepper (Piper nigrum) and cacao (Theobroma cacao) in Bahia, Brazil
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Under-exploited TreesA large number of underexploited trees that provide a variety of products are used in indigenous farming systems throughout the world
� Food (Fruit trees)
� Fertilizer (Nitrogen-fixing trees)
� Fodder (Fodder trees)
� Fuelwood (Firewood species)
� Medicinal and aromatic products
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Alley cropping: tree hedgerows + crops; Africa
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Fertilizer Trees African farmers interplantnitrogen-fixingtrees with crops to provide nutrients to crops and reducedependence on costly fertilizers
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Olive trees + barley; Italy
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Paulownia trees + wheat; China
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Agroforestry Practices in North America Alley cropping Trees planted in single or grouped rows with
herbaceous crops in the wide alleys between the tree rows
Forest farming Utilizing forested areas for producing specialty crops that are sold for medicinal, ornamental, or culinary uses
Riparian buffer strips
Strips of perennial vegetation (tree/shrub/grass) planted between croplands/pastures and streams, lakes, wetlands, ponds, etc.
Silvopasture Combining trees with forage and livestock production
Windbreaks Row trees planted around farms and fields and managed as part of crop or livestock operation to protect crops, animals, and soil from wind hazards
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Alley Cropping: Trees planted in single or grouped rows in herbaceous crops in the wide alleys between the tree rows
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Ornamentals Specialty crops; Ginseng
Forest Farming; NY, USA
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Silvopasture:Animals with trees
With pecan trees
With pines
Cattle and pasture under pines
With pines
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Riparian buffer; IA,USA
“Before” “After”
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Trees as windbreaks; NE, USA
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The Coming of Age of Agroforestry
• Agroforestry has come of age during the past 25 years
• The traditional practices have been transformed into robust, science-based technologies
• AF is no longer “a practice in search of science”; it is based on scientific foundation
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Eucalyptus + maize intercropping, Brazil Photo courtesy: Laercio Couto
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Silvopasture (E. grandis) in Uruguay: Cofusa (Compania Forestal Uruguaya S.A.).
Photo courtesy: Timothy White.
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The Dehesa of the western Mediterranean region: An extensive silvopastoral system (Animal grazing under scattered oak trees)
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On-farm production of Eucalyptus grandis formeeting energy needs of tea factories in Kenya
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Intercropping fruit trees (eg, mangosteen) and other valuable species (eg, sandalwood) with oil palm in Sabah, Malaysia
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Sustainability and Agroforestry Systems
Ecological, Economic, and Social Factors
Ecological Sustainability• Enhancing productivity
� Soil Physical Conditions
� Soil Fertility
• Providing Ecosystem Services
� Biodiversity
� Carbon sequestration
� Water quality enhancement
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Maintaining variation in genetic composition and a variety of species
For the purposes of conserving diversity through agroforestry systems, both geneticdiversity and speciesdiversity are important
Biodiversity
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Carbon Sequestration• Extent of original C stock of the cleared forest regained
through land-use systems in the tropics:AF systems = 35 %; Croplands and pastures = 12 % (Palm et al., 2004).
• An increase of 1 Mg of soil C pool of degraded cropland soils may increase crop yields by 20 to 40 kg ha-1 (Lal, 2004).
• Projected C stocks for smallholder agroforestry systems:C sequestration rates of 1.5 to 3.5 Mg C ha-1 yr-1;Tripling of C stocks in a 20-yr period, to 70 Mg C ha-1.(Palm et al., 2004).
•Global deforestation, estimated to occur @ 17 mill ha yr-1, is expected to cause the emission of 1.6 Pg C ha-1 yr-1.
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Carbon Sequestration in Soils: Silvopasure vs Treeless Pasture
• Total C greater in surface soils and less in deeper profile of pasture (bahiagrass) soils
• Little contribution by C3 plants in surface soils of bahiagrass pasture in the Spodosol
% of C contribution from C3 plants0 20 40 60 800
20
40
60
80
100
Soil
Dep
th (c
m)
120
A
E
Bh
Bw
A Spodosol Profile
-1
120
Total Carbon (g C kg )0
20
40
60
80
100
0 10 20 30 40 50
Soil
Dep
th (c
m)
Silvopasture
Treeless pasture
Studies on Spodosols in two counties of Florida, USA
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Water Quality Enhancement• Nutrient-leaching rates from soils under AFsystems can be lower than those from treeless systems.
• The “safety-net” effect: The deeper and more extensive tree roots will take up more nutrients from the soil compared to crops with shallower root systems.
• The reduction of nutrient loading leads to water- quality enhancement in heavily fertilized agricultural landscapes. Consequently,
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0
10
20
30
40
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60
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0 5 10 15 20 25 30
WSP concentration (mg kg-1)
Soil
dept
h (c
m)
Silvopasture (Alachua)
Treeless (Alachua)
Silvopasture (Suwannee)
Treeless pasture (Suwannee)
Water soluble P (WSP)concentrationsby depth in silvopasture and treeless pasture sites on Spodosols in two counties (Alachua and Suwannee) in Florida, USA.
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Riparian buffers for reclamation
of degraded croplands
Degraded cropland
… the same site, 15 years later
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� Poverty Alleviation
� Food Security
� Deforestation
� Fodder- and Fuelwood Shortages
� Environmental Protection
� Land Degradation
� Income Generation
� Biodiversity Conservation
� Water Quality
� Social Quality of Life
T R
O P I C
A L
R E
G I O
N S
T E
M P
E R
A T
E R
E G
I O
N S
Agroforestry and the Top Ten Land-Use Challenges
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Not a panacea … Agroforestry is certainly not a “cure-all” solution nor a substitute for commercial agriculture and forestry.
But, it is an appropriate approach in some situations, especially under low- input conditions.
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Sustainable Agroforestry Systems for EnhancingProduction Benefits and Ecosystem Services
Sustainability
Ecological Factors Social Factors Economic Factors
and Agroforestry Systems
ENHANCINGFOOD and FIBER
PRODUCTION
N2 Fixation
NutrientCycling
Deep Capture of Nutrients
Improving Soil Physical Conditions
PROVIDINGECOSYSTEM
SERVICESSoilConservation
Carbon StorageWater Quality Enhancement
BiodiversityConservation
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Agroforestry is an idea whose time has come …
As Mark Twain said:
“Twenty years from now, you will be more disappointed by the things you didn’t do than by the ones you did.”