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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This note was uploaded on 06/18/2009 for the course BIOL- 112 taught by Professor Bryanness during the Fall '09 term at Pacific Union.

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b112_Lecture_54 - Pollution • 4 The human element...

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