lesson 8 woodland survey updated
TRANSCRIPT
Bio-Diversity in Bio-Diversity in HomewoodHomewood
Citizenship Criteria
• Improving research skills
Role
• You are the Environmental Protection Officer for Homewood School
• In your pair come up with ideas to protect the school environment
Task• Mr. Adam wants a detailed report on the trees in
Homewood. You will go to the woods and carry out a survey of all the trees
• You will record the tree types and produce a short report with graphs on the types of trees we have
• You will comment on
how we use the
woods
Method• You will be given a laminated A3 sheet
with hints on identifying the common tree types
• You need a tape measure,
your tally charts, the
laminated sheet and
a pencil• Complete the following table as a tally
Tree types in Homewood
OtherSweet ChestnutPlaneOakLime
FirElmBirchBeechAlder
Tree size
• You also need to record data on the size of tree trunks and the length of leaves
Leaf data
• Measure the lengths of the tree leaves, making sure to include oak, beech or sweet chestnut leaves
Sweet Chestnut
BeechOak
Recap
• While doing the survey we will:• Make a tally chart of the different tree types• Measure the trunk sizes of each tree type• Measure the length of several leaves of each tree
type
• Collect one leaf from each tree type to bring back to the classroom
Survey time
• Now go with your teacher to carry out your survey
• If you cannot identify the tree in the field then bring a leaf back and we will try to identify it in the classroom
What did you find?
• Identification of trees is difficult, here is some help. Log on to the internet and try this link, you will need a leaf from the tree you want to identify
• http://www-saps.plantsci.cam.ac.uk/trees/
Findings
• In collecting our findings we will do the following tasks
1. Turn our tally chart into a bar graph
2. Note down and compare the tree trunk sizes
3. Approximate the area of each leaf type using squared paper
4. Approximate the perimeter of each leaf type using string
5. Calculate the average (mean and median) leaf lengths for each tree type
Maths Reminder
• “How do I calculate averages again?”
• As a reminder, let us imagine we had collected a list of leaf lengths as follows:
18.5cm, 19cm, 17.25cm, 12cm, 13.25cm
18.5cm, 19cm, 17.25cm, 12cm, 13.25cm
How to calculate the MedianFirst of all we must re-write the list in order:
12, 13.25, 17.25, 18.5, 19
Then we find the number which is placed in the middle of the list
12, 13.25, 17.25, 18.5, 19Median = 17.25cm
If there are two numbers in the middle then we should find the mean (average) of those two numbers
18.5cm, 19cm, 17.25cm, 12cm, 13.25cm
How to calculate the MeanFirstly, we need to add all of the numbers together
18.5 + 19 + 17.25 + 12 + 13.25 = 80
Then we should divide that total by however many numbers were in the list
80 ÷ 5 = 16
Mean = 16cm
Results• Collect all of your findings on the
worksheet• Write down your method (what you did).
You need to write it in a way so that somebody else can go and do exactly the same survey
• Make a neat table of your results
Graphs
• You need to make some graphs of your results, consider
• Bar graphs: these will show how many examples of each type of tree there are
• Pie Graph: this will show the proportions of trees there are
Conclusion
• This is an important part of the report. You must make a concluding comment about the woods and your survey for Mr. Adam
Final Questions
• Do we need to do more to look after the woods?
• Should we consider ways to get more students using the woods (would this be safe)?
• Should we add more woods?
• Should we cut them down for buildings or playing fields?