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The Changing Trees of Autumn

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The Changing Trees of Autumn By Meryl Spierenburg ED 205 (15) Concept Map Quit About the Author Quit Resources Let s Learn About the Leaves! Where do the colors ... – PowerPoint PPT presentation

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Title: The Changing Trees of Autumn


1
The Changing Trees of Autumn
  • By Meryl Spierenburg
  • ED 205 (15)

Concept Map
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About the Author
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Resources
2
Lets Learn About the Leaves!
  • Where do the colors come from?
  • Why do the leaves change color?
  • How does it work?
  • Why do leaves FALL?
  • What happens after the leaves fall?
  • How do we get the best colors?

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3
Where do the colors come from?
  • Leaves have pigments that give them their color.
  • There are 3 pigments are involved in the autumn
    color.
  • Chlorophyll
  • Carotenoids
  • Anthocyanins
  • How do they all work together?

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4
Chlorophyll
  • Chlorophyll is the pigment that gives leaves
    their basic green color.
  • Chlorophyll is necessary for photosynthesis, the
    chemical reaction that lets plants use sunlight
    to make food.

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5
Carotenoids
  • Carotenoids are the pigments that produce yellow,
    orange, and brown colors in the leaves.
  • The are also found in things like corn, carrots,
    and bananas.

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6
How do they all work together?
  • Chlorophyll and carotenoid are in leaf cells all
    the time during the growing season. But the
    chlorophyll covers the carotenoid . That's why
    summer leaves are green, not yellow.
  • Most anthocyanins are produced only in autumn.
    Not all trees can make anthocyanins.

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7
Anthocyanins
  • Anthocyanins are the pigments that give leaves
    their red color.
  • The are also found in cranberries, red apples,
    blueberries, cherries, and plums.

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8
Why do the leaves change color?
  • Leaves change color mainly because of the longer,
    cooler nights that occur in Autumn.
  • As the nights get cooler and longer, a
    biochemical process takes place that causes the
    leaves to change in color.
  • Click here to watch a video about why leaves
    change color

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9
How does it work?
  • During the spring and summer, chlorophyll is
    continually being made, and leaves are green.
  • As the nights get longer in the fall, chlorophyll
    making slows down and then stops and eventually
    all the chlorophyll is gone.
  • The carotenoids and anthocyanins that are in the
    leaf are then able to show their colors.

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10
Why do the leaves fall?
  • In early autumn, the veins that carry fluids into
    and out of the leaf gradually close off.
  • These closed veins trap sugars in the leaf and
    start the making of anthocyanins.
  • When this is complete, the leaf is ready to fall

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11
What happens after the leaves fall?
  • On the ground, fallen leaves are broken down by
    bacteria, fungi, earthworms, and other organisms.
  • The broken-down leaves give the soil nutrients
    and become part of the layer on the forest floor
    that absorb and hold rainfall.

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12
When do we get the best color?
  • The autumn colors are the most vibrant when there
    has been
  • A warm and wet spring
  • A summer that isnt too hot or dry
  • A fall full of warm days and cool nights.

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13
About the author
  • This powerpoint was created by Meryl
    Spierenburg. I am a Junior at Grand Valley State
    University, majoring in English with a minor in
    Elementary Education.
  • Please, feel free to e-mail me at
    meryljoy_at_charter.net

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14
Concept Map
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15
Resources
  • http//www.jimpetrozzi.com/site_WW/thumb-wallpaper
    /Red20Leaves.jpg
  • http//www.desktoprating.com/wallpapers/nature-wal
    lpapers-pictures/fall-of-autumn-leaves-wallpaper.j
    pg
  • http//www.jimpetrozzi.com/site_WW/thumb-wallpaper
    /Red20Leaves.jpg
  • http//riversaredamp.files.wordpress.com/2007/10/y
    ellow-leaves.jpg
  • http//www.pewclimate.org/docUploads/images/green
    20leaves20with20rain20drops.jpg
  • http//www.dnr.state.wi.us/org/caer/ce/eek/veg/tre
    es/treestruecolor.htm
  • http//www.na.fs.fed.us/spfo/pubs/misc/leaves/leav
    es.htm
  • http//www.esf.edu/pubprog/brochure/leaves/leaves.
    htm
  • http//farm1.static.flickr.com/113/315997493_35bc9
    5c19c_o.jpg

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