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Transcript
Introduction
Major Themes
Lecture 1
Spring 2014
1
• Why do we need plants?
• Why do we need bacteria or fungi (or
protists!)
2
• What nutrients do plants need?
• Where do those nutrients come from?
3
Soil Formation
• Basis of terrestrial
food webs
– NPK Nitrogen,
Phosphorus,
Potassium
• Formation time
Soil stratification. USGS 2003
Decomposers
Detritivores
Specialized consumers
Which organisms are
decomposers?
4
The Soil Food Web
5
6
Nutrient
Cycling
• Biogeochemical
cycling
– Biotic and
abiotic
components
• Reservoirs
(sources & sinks)
• Residence time
Fig. 55.13
7
The Carbon Cycle
Fig. 55,14
8
The Nitrogen Cycle
Nitrogen fixation &
Denitrification
Fig. 55.14
9
The Phosphorous Cycle
• Phosphate
Fig. 55,14
Symbiotic Relationships
Symbiosis – intimate living
together of members of two
or more species.
• Mutualism
• Parasitism
– pathogen
• Commensalism
Fig. 54.8
10
11
Other Questions
• How did plants evolve?
• Do plants behave?
• What do we need to know about
ecosystems in order to restore them?