Lectures notes from 2/9/16
Lectures notes from 2/9/16 ISB 201
Popular in Insects, Globalization, and Sustainability
Popular in Entomology
This 3 page Study Guide was uploaded by chloegrignon on Wednesday February 10, 2016. The Study Guide belongs to ISB 201 at Michigan State University taught by Dr. Gabe Ording in Fall 2015. Since its upload, it has received 45 views. For similar materials see Insects, Globalization, and Sustainability in Entomology at Michigan State University.
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Date Created: 02/10/16
Last lecture before exam 1 Desertification Healthy ecosystem becomes arid 1/3 of population lives here Causes: overgrazing, deforestation, soil compaction Explain how desertification occurs: Overgrazing leads to decline of plants leads to exposed soils leads to erosion leads to topsoil and nutrients gone which leads to desertification Soils of Michigan Major factors impacting soil management: Glaciers: 30 inches of topsoil in 10,000 years Soil erosion Sustainable yield: soil is a renewable resource but we are using it more than it can be replenished Soil regeneration is really slow; being lost 1040x more than it can be replaced Dust bowl What economic highs and lows contributed to it? Wheat grew without crop rotation practice Farmers plowed intact ecosystems to grow more wheat Too much wheat was produced so price declined and farmers left as a result, which meant fields were left exposed, causing the dust storm and soil pickup Hubbert’s Peak Calculation on a bell curve that estimates that when this is hit, half of our nonrenewable oil stock will be depleted. Related, phosphorus is also reaching its peak of depletion, which is more important than oil because we use it for farming and there are no comparable alternatives to it Ording, Gabe. "Environmental ecology." Lecture.
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