Lecture 12 Eco3A

Lecture 12 Eco3A - 2/24/09 Lecture 12 Ecosystems III: Human...

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2/24/09 1 Lecture 12 Ecosystems III: Human impacts Reading Ch 55 Human impacts on ecosystems I. Nutrient enrichment II. Toxins in the environment III. Climate change Nutrient Enrichment Example – Nitrogen (N) Agriculture disrupts natural N cycle Crops harvested (removed) - N not recycled N added as fertilizer Is this a problem? I. Nutrient Enrichment A. What is it? B. Where does it come from? C. What are the effects? 1. Eutrophication 2. Dead zones A. Nutrient Enrichment - what is it? Critical load - the amount of nutrient that can be absorbed by plants Excess fertilizer… Excess nutrients leach into aquatic ecosystems - lakes, near-shore oceans B. Where does nutrient enrichment come from? Nutrient additions agricultural fertilizer runoff from animal feedlots, pastures, range storm drains (lawn fertilizers, pet waste) sewage spills
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2/24/09 2 C. Nutrient Enrichment - what are the effects? 1. Eutrophication - increase productivity as a result of an increase in nutrients What happens?
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This note was uploaded on 04/29/2009 for the course BILD BILD 2 taught by Professor Schroeder during the Spring '08 term at UCSD.

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Lecture 12 Eco3A - 2/24/09 Lecture 12 Ecosystems III: Human...

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