1 mon. tues. wed. thurs. fri. week of oct. 6 week of oct. 13 no labs – fall break week of oct. 20...
TRANSCRIPT
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Mon. Tues. Wed. Thurs. Fri.Week ofOct. 6
Week ofOct. 13
No labs – Fall Break
Week ofOct. 20
Wet, muddy outdoor lab – wear closed-toed shoes
Week ofOct. 27
Independent project set-up
Class in LibraryMultimedia Room
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Outline for ecosystems
Introduction
How does energy move through an ecosystem?
How does matter move through an ecosystem?
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How does matter move through an ecosystem?
Matter = elements
e.g., what are ways that a carbon atom movesfrom one compartment of an ecosystem to another?
How fast do carbon atoms move from one compartment to another?
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Organisms move elements through chemical transformations
organic C inorganic C
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Figure 7.1
inorganicinorganic
organic organic
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Figure 7.2
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How does matter move through an ecosystem?
Cycles between inorganic and organic forms andbetween different compartments of ecosystems
Difference between matter and energy movement?
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Figure 7.3
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Cycles of matter
watercarbonnitrogenphosphorussulfur
Focus on important pools and transfers
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Figure 7.4
Water cycle
11Figure 7.5 Carbon cycle
C cycle
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Figure 7.6
Biological transformations of carbon
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Fig. 7.11
N cycle
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Figure 7.11be.g., proteins inorganic forms
used by plants
Biological transformations of nitrogen
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Figure 7.13
P cycle
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Figure 7.14a S cycle
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Figure 7.14b
Biological transformations of sulfur
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What do I expect you to know about element cycles?
- which forms are available to bacteria, plants,and animals
-which transfers are changes in form of theelement
- which transfers are biological transfers vs. chemical or physical transfers
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How does matter move through an ecosystem?
Nutrient recycling in terrestrial andaquatic ecosystems
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Nutrient recycling in terrestrial systems
- where is it happening?
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Nutrient recycling in terrestrial systems
- new weathering of bedrock provides small amount of nutrients taken up by vegetation each year (~10%)
- how do we know that?
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-mass balance
-inputs = outputs
-weathering + precipitation =loss in streams
measurecalculate by difference
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Organic matter decomposition
1. Leaching of soluble compounds by water
2. Consumption by detritus-feeding orgs.- e.g., earthworms, millipedes, etc.
3. Breakdown of rest by fungi and bacteria- how do they decompose?
What factors affect rate of decomposition?
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Effect of rainfall on rate of leaf decomposition
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Litter/living leaf
Soil P/plant P
Soil N/plant N
%of total org C
Tropical Temperate
Which column is larger?
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Land use affects phosphorus retention in a system
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Nitrogen fixation can increase nitrogen avail.
Litter quality (nitrogen content) of different tree species
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Mychorrhizae increase nutrient content ofplants
Fig. 8.7