Week 13, Lecture 2, Energetics

Week 13, Lecture 2, Energetics - Ecosystem Energetics....

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1 Lajoie –Energy flow ‘09 Ecosystem Energetics. .. Chap 47 Lajoie –Energy flow ‘09 Ecosystems Biological community + Physical environment Biotic + Abiotic Energy flow + Chemical cycles 1. Trophic structure 2. Food chains/webs 3. Energy flow Lajoie –Energy flow ‘09 1. Trophic structure Heat! Sunlight Sunlight 1˚ producers Chemical 1˚ consumers nutrients 2˚ consumers Decomposers 3˚ consumers Lajoie –Energy flow ‘09 1. Trophic structure See Fig 47.5 See Fig 47.1 Lajoie –Energy flow ‘09 2. Food chains and Food webs • Webs for herbivores and carnivores well known • Decomposer webs not as well known Lajoie –Energy flow ‘09 3. Energy flow Solar energy falling on earth = 1x10 22 joules/day How many 100 watt light bulbs? Primary Productivity - rate of conversion of light to chemical energy - 1% of light falling on plants is trapped - gross vs net productivity Gross Primary Productivity (GPP) - light energy to glucose molecules - total primary productivity
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2 Lajoie –Energy flow ‘09
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Week 13, Lecture 2, Energetics - Ecosystem Energetics....

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