b112_Lecture_54

b112_Lecture_54 - Pollution. 4. The human element....

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3/11/2008 1 BIOL 112, Chapter 54 Ecosystems Primary Productivity Only about 1 2% of the visible light from the sun is converted to chemical energy by photosynthesis NPP = GPP R NPP = GPP – Rs NPP is often 50 90% of GPP Measuring Primary Productivity Measuring biomass production, dry weight (g/m 2 /yr) Light dark bottle experiments, measuring net oxygen production (g O /m 2 /yr oxygen production (g O 2 /m /yr)
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3/11/2008 2 Secondary Productivity Biomass Pyramids Pyramid of Numbers Biogeochemical Cycle Biogeochemical Cycles
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3/11/2008 3 Human Impacts on the Environment The Biosphere is a Closed System Sunlight is the only input All other parts of the biosphere are finite and must be recycled
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3/11/2008 4 Four Areas of Concern 1. Overpopulation. 2. Resource depletion. 3.
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Unformatted text preview: Pollution. 4. The human element. Overpopulation In 1986 the world population hit 5 billion Population is increasing at ~1.7% per year Population will double every 41 years Currently between 6 and 7 billion Factors Responsible for Rapid Population Growth Increased food production. Better disease control. Better sanitation. No decrease in birth rates. Resource Depletion Renewable Resources Water Biomass Soil & mineral Soil & minerals Nonrenewable Resources Fossil Fuels Species Pollution Eutrophication Smog Toxic Waste Greenhouse effect Ozone depletion The Human Element Frontier mentality Tragedy of the commons...
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b112_Lecture_54 - Pollution. 4. The human element....

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