so, what’s the deal with pine needles?
Post on 04-Jan-2016
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So, what’s the deal with pine needles?
Genevieve Chung
Ethel Stanley
Susan Finazzo
Why use plants as models for data collection?
• Plants are everywhere familiar
• Students ‘see’ them without seeing them.
• Plants respond to the environment, both macroscopically and microscopically.
• You probably won’t have PETA knocking your door down.
Why do pines?
• Common plants
• Background info available
• Perennial evergreens have ‘history’.
• Tree leaves exist in microenvironments.
Student Generated Data
• Student develop hypotheses (re:leaves).– Directional differences (east facing vs. west
facing)– Age factors– Canopy location– Different tree data, irrigated vs. non-irrigated– So many questions, so little time…..
Our Data
• East and West Branches• This year’s and last year’s
growth• Number of fasicles• Length of fasicles• Wet weight• Dry weight
Data Presentation with Merlin
Sample Number
0
2
4
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Sample1(mm)
Sample2(mm)
Sample 3(mm)
Sample 4(mm)
Sample 5(mm)
Sample 6(mm)
Sample Number
Le
af
Le
ng
th
• Sample 1
– East side
– 15 fasicles, 2009
• Sample 2
– West side
– 48 fasicles, 2009
• Sample 3
– East side
– 30 fasicles, 2010
• Sample 4
– West side
– 32 fasicles, 2010
• Sample 5
– East side, main branch
– 66 fasicles, 2009
• Sample 6
– West side, main branch
– 84 fasicles, 2009
Data Presentation with Merlin
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Fresh Weight (mg)
Su
m N
ee
dle
Le
ng
th (
mm
)Sample Net fresh weight (mg) Sum Needle length
1 3,086 139.70
2 6,785 366.15
3 3,964 189.95
4 4,468 225.05
5 13,716 568.70
6 15,841 765.60
More Merlin
Sample Dry weight mg Sum Needle length
1 1568 139.70
2 3507 366.15
3 1510 189.95
4 1729 225.05
5 7255 568.70
6 8090 765.60
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Dry Weight (mg)
Su
m N
ee
dle
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th
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