Testing preconceptions Connecting concepts and “Big” ideas.
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Transcript of Testing preconceptions Connecting concepts and “Big” ideas.
Testing preconceptions
Connecting concepts and “Big” ideas
Where does most of the mass in this piece of wood come from?
1. Air
2. Soil
3. Water
4. Nutrients dissolved in water
Where does most of the mass in this piece of wood come from?
1. Air
2. Soil
3. Water
4. Nutrients dissolved in water
What is the basic molecule from which this mass is derived?
1. N2
2. O2
3. CO2
4. H2O
What is the basic molecule from which this mass is derived?
1. N2
2. O2
3. CO2
4. H2O
Question 1
0
20
40
60
80
100
Air Soil Water Nutrient inwater
Q1
Question 2
0
20
40
60
80
100
N2 O2 CO2 H2O
Q2
Question 1
0
20
40
60
80
100
Air Soil Water Nutrient inwater
Q1
Question 2
0
20
40
60
80
100
N2 O2 CO2 H2O
Q2
Answer to Q1 provided prior to Q2
Answer to Q1 NOT provided prior to Q2
Photosynthesis – part of a big idea, a spanning idea
THE PERSPECTIVE OF AN ECOLOGIST
PsynthCarbon from Air
Plant physiologyCell biologyChemistryAnatomy
Energy and Ecosystems
Carbon Fixation Net Primary productivityJoining biological and abiological Energy flowNutrient cycles
Human impacts
Limiting factorsFeedbacks
Starch Cellulose
Calvin Cycle – light independent
RuBP 3PG
G3P
CARBOX
REDUCTREGEN
ATP
NADPHATP
NADP+
ADP
Carbon CO2
RUBISCO
ADP
Temperature and Enzyme Activity
Activity for the two is not on the same scale
Psynth & Patterns of Primary Productivity
kgC/m2 -yr
3
2
1
0
54.1
Energy &
Nutrient dynamics
• Primary production
• Secondary production energy flow
Psynth and CO2 fixation
Atmosphere Green plants
Consumers
DetritusDetritivores
microbes
Fossil fuel
Ocean
Sediments
The Carbon Cycle
photosynthesis
resp
iratio
n
Energy/biomass transferFood chain--system level
bog
1.5
11
37
809
0 100 200 300 400 500 600 700 800 900
1
2
3
4
small mammals
small carnivore (e.g, weasel)
top carnivore (e.g., hawk, fox)
Trophic efficiency is the percentage of production (energy) transferred from one trophic level to the next to form new
biomass
Trophic efficiency (%)
14%
29%
4.6%
Florida Bog
6.3-6.5 billion metric tonnes!
1.8-2 billion
Human Alterations to Global Carbon Dynamics