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Effects of Sunlight & Soil on Tree Growth in a Year

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Demi Lade

on 16 October 2015

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Transcript of Effects of Sunlight & Soil on Tree Growth in a Year

Growth vs. Sunlight
Introduction
Question: How does the soil and sunlight affect the growth of trees in a year?
soil -> pH, moisture, nitrogen content
pH: concentration of hydrogen ions in a substance
nitrogen content: promotes leaf growth
growth bud: measure of tree growth in a year

Why is this important?
Hypotheses
more sunlight (up to a certain point) -> more growth
plants need light for photosynthesis, but too much light can lead to wilting
best growth in a year would be plants in soil with pH between 6-8
plants cannot grow very low/high pH
more moisture (up to a certain point) -> more growth
plants need water to survive, but too much will cause the plant to undergo lysis
the longer the growth bud, the more nitrogen the soil contains
nitrogen in soil promotes leaf growth
Methods
Data Analysis
Data from the Meadow
Improvement and Limitations
Improvements
larger sample size [more data points]
check soil temperature
light meter couldn't measure past 2000 PAR

Limitations
light meter couldn't measure past 2000 PAR
not enough pills for nitrogen test
drought affected moisture levels in soil

Extended Research
if surrounding plants affect the growth of a tree
Sunlight: Meadow vs. Forest
Effects of Sunlight & Soil on Tree Growth in a Year
Demi
Keya
Angelica
Justina

Day 1 [Wetlands/Meadow]
created quadrants for testing
at each location:
tested for sunlight, soil pH, soil moisture
measured the growth buds
gathered a soil sample
measured nitrogen content
Day 2 [Forest]
created quadrants for testing
at each location:
tested for sunlight, soil pH, soil moisture
measured the growth buds
gathered a soil sample
measured nitrogen content
Growth vs pH
Growth vs. Moisture
Data from the Forest
pH: Meadow vs Forest
Moisture: Meadow vs. Forest

T-Chart
t = 2.6851
df = 28 (amount of data)
P value = 0.0120 (very significant)
t=4.4176
df=12 (amount of data)
P value= 0.0008 (very significant)
t=0.8111
df=28 (amount of data)
P-value=0.4241 (not significant)
In regards to sunlight:
overall, plants exposed to more sunlight had more growth in a year
In regards to pH:
our data showed us that the optimum pH was 7.8
range in which tree grew-> 7.1<growth<7.8
In regards to moisture:
the moisture didn't really affect growth
due to drought
In regards to nitrogen:
lodge pole pines not affected by nitrogen in soil
soil is nitrogen depleted
Conclusion
Hypotheses in regards to:
sunlight
supports
pH
support
moisture
inconclusive
nitrogen content
doesn't support

t=1.7495
df=28 (amount of data)
P-value=0.0912 (close to significant)
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