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39 Cards in this Set
- Front
- Back
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Doubling Time
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DT=70/ %growth rate
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Population Change
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P2=P1+(B-D)+(I-E)
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Ecological Footprint
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Total Land area needed to support one individual in a country
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Weathering
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Breaking of rock by wind, water, and freezing
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Leaching
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As water moves down soil, it carries nutrients and dissolves them away.
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Chemical Weathering
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When water dissolves some minerals found in rocks.
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Demography
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The study of population
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Exponential Growth
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Growth by a given rate %
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Linear Growth
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Growth by the same amount every year
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Population
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Group of individuals of teh same species living in a certain area.
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Crude Birth Rate
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Number of births per 1000 individuals per year
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Species
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All individuals that are capable of interbreeding
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Crude Death rate
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Number of deaths per 1000 individuals per year
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GNP Per capita
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Gross National Product, includes the value of all domestic and foreign output per person
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Replacement-level fertility
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The total fertility rate required for a population to remain constant
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Total Fertility Rate
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Avg number of children expected to be born to a woman during her lifetime
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Life Expectancy
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AVG number of years an individual can expect to live given his/her present age
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Logistic Growth
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When a Small Population Grows rapidly, but teh growth rate slows down. Teh population reaches a constant size eventually.
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Green Revolution
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Crops being modified genetically to produce higher yields, grow in poor conditions or fight pests off. Teh period is refered to as green revolution
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Limiting Factor
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Single Requirement for growth that is available in the least supply in comparison to teh need of the crop
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Liebig's Law of teh minimum
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The idea that some single factor determines teh growth and tehrefore teh presence of a species
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Sustainable yield
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The amount produced per unit area that can be continued indifinitely without decreasing the ability of that crop species to sustain that yield
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Limits to food production
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Global Warming
Population Growth Development of higher producing crops |
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Primary and secondary effects of sgriculture
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Erosion
Sedimentation deserification pollution deforestation overgrazing salinization climate changes |
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Topsoil
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Topsoil is in layer A which contains organic matter
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Components of fertile soil
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Wheathered rock
Organic Material Living Organisms |
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Desertification
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Teh process of creating a desert where there was not one before
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Overgrazing
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When the carrying capacity of land for herbivores is exceeded
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Game Ranching
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Mantaining wild herbivores in their native habitat to be harvested for meat and leather
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Contour Plowing
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Plowing land across topographic contours
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Subsistence Crops
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Crops used directly for food by a farmer or sold locally where teh food is used directly
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Per capita food production
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amount of food production per person
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Per capita demand
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Economic demand per person
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monoculture
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planting of large areas with a single species or even a single stain .
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Mariculture
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production of food from marine habitats
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Hydroponics
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Growing plants in a fertilized water solution in an artificial environment
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Drip irrigation
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irrigation by the application of water to teh soil from tubes that drip water slowly
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Cash crop
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Crops grown to be traded in a market
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Aquaculture
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Production of food from aquatic habitat
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