food resources
DESCRIPTION
Food Resources. Human food systems: Croplands Rangelands Oceanic fisheries. Solar Capital. Air resources and purification. Climate control. Recycling vital chemicals. Water resources and purification. Renewable energy resources. Soil formation and renewal. Natural - PowerPoint PPT PresentationTRANSCRIPT
Food Resources
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
Human food systems:
1.Croplands2.Rangelands3.Oceanic
fisheries
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
To feed the increasing world population we must:
• Produce and equitably distribute more food than ever before.
• Do this in a environmentally sustainable way.
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
SolarCapital
Airresources
andpurification
Climatecontrol
Recyclingvital
chemicalsRenewable
energyresources
Nonrenewableenergy
resources
Nonrenewablemineral
resourcesPotentiallyrenewable
matterresources
Biodiversityand gene
pool
Naturalpest anddiseasecontrol
Wasteremoval and
detoxification
Soilformation
andrenewal
Waterresources
andpurification
NaturalCapital
Limitations:• environmental degradation• pollution• lack of water for
irrigation• overgrazing• overfishing• loss of ecological
services
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
FOUR Types of Agriculture Systems:
Industrialized agriculturein developed countries
Land
Labor
Capital
Fossil fuelenergy
•Uses large amounts of fossil fuels energy, water, commercial fertilizer, and pesticides to produce huge quantities of single crops or livestock animals for sale.
• 25% of croplands in developed countries.
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
•Uses large amounts of human input and draft labor, water, and fertilizer, to produce enough food to feed their families and sell for income.
• In North America 2.4% of labor force is used in agriculture vs 45-65% in developing countries.
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
Intensive traditional agriculturein developing countries
Land
Labor
Capital
Fossil fuel energy
•Growing cash crops on large monoculture plantations, mostly for sale.
• A large amount of livestock production is industrialized. Mostly pigs and chicken are raised in densely populated pens and cages and are fed mostly grain from croplands.
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
Shifting cultivation in tropicalforests in developing countries
Land
Labor
Capital
• Uses mostly human labor and draft animals to produce only enough crops or livestock for a farm family’s survival.
• Practiced by 2.7 billion people (44% of the world’s population).
•Provide 20% of the world’s food supply.
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
Nomadic herding indeveloping countries
Land
Labor
Capital
Rangelands• About 40% of the earth’s ice-free land.• This land provides forage or vegetation
for grazing and browsing animals.
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
Fisheries• The world’s third major food-producing
system.• 55% of the annual commercial catch comes
from the ocean.• Harvesting methods:
] Trawler fishing] Purse-seine] Longlineing] Drift-net
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
Spotter airplane
Fish farmingin cage
Trawlerfishing
Purse-seinefishing
sonartrawl flaptrawllines
trawl bag
Long line fishing
lines withhooks
Drift-net fishing
Fish caughtby gills
float buoy
fish school
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
http://www.youtube.com/watch?v=Nk19PMo1sLI
Comparing Food ProductionTerrestrial
• Food is harvested from low trophic levels.
• More efficient fixing of solar energy by photosynthesis.
Aquatic• Food is harvested
from higher trophic levels mostly because of human taste.
• Energy conversions are more efficient along the food chain.
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
Major Environmental Effects of
Food Production
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
Biodiversity Loss
Loss and degradation of habitat fromclearing grasslands and forests anddraining wetland
Fish kills from pesticide runoff
Killing of wild predators to protectlivestock
Loss of genetic diversity fromreplacing thousands of wild cropstrains with a few monoculture strains
Soil
Erosion
Loss of fertility
Salinization
Waterlogging
Desertification
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
Air Pollution
Greenhouse gas emissions from fossilFuel issue
Other air pollutants from fossil fuel use
Pollution from pesticide sprays
Water
Aquifer depletion
Increased runoff andflooding from land clearedto grow crops
Sediment pollution fromerosion
Fish kills from pesticiderunoff
Surface and groundwaterpollution from pesticidesand fertilizers
Overfertilization of lakesand slow-moving riversfrom runoff of nitrates andphosphates fromfertilizers, livestockwastes, and foodprocessing wastes
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
Human Health
Nitrates in drinking water
Pesticide residues in drinking water,food, and air
Contamination of drinking andswimming water with disease organismsfrom livestock wastes
Bacterial contamination of meat
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
Increasing Crop
Production
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
Genetic engineering
ProjectedAdvantages
ProjectedDisadvantages
Need less fertilizer
Need less water
More resistant toinsects, plant disease, frost, anddrought
Faster growth
Can grow in slightlysalty soils
Less spoilage
Better flavor
Less use of con-ventional pesticides
Tolerate higherlevels of herbicideuse
Irreversible andunpredictablegenetic and eco-logical effects
Harmful toxins infood from possibleplant cell mutations
New allergensin food
Lower nutrition
Increased evolutionof pesticide-resistant insectsand plant diseases
Creation of herbicide-resistant weeds
Harm beneficialinsects
Lower geneticdiversity
Try new foods• Increase cultivation of less widely
known plants to supplement or replace staple foods.• Insects – microlivestock – could be an
important potential source of protein.
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.
Irrigate &Cultivate
More Land
In use
Not usable
Arid land6%
Tropicalforest
8%
Cultivated
10%
Grazed
11%Forests,
aridlands
14%
51%
Ice, snow, desertsmountains
Topic 3The Soil System and Food Production
Students will be able to:-to discuss the links that exist between social systems and food production systems.