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A severe drought can delay the arrival of fall colors by a few weeks. A warm, wet period during fall will lower the intensity, or brightness, of autumn colors. A severe frost will kill the leaves, turning them brown and causing them to drop early.
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www.dnr.state.wi.us/org/caer/ce/eek/veg/trees/treestrue...
www.dnr.state.wi.us/org/caer/ce/eek/veg/trees/treestruecolor.htm
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Every autumn we revel in the beauty of the fall colors. The mixture of red, purple, orange and yellow is the result of chemical processes that take place in the tree as the seasons change from summer to winter. During the spring and summer ...
http://www.esf.edu/pubprog/brochure/leaves/leaves.htm
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Some of them give rise to the reddish and purplish fall colors of leaves of trees such as dogwoods and sumacs. Others give the sugar maple its brilliant orange or fiery red and yellow. The autumn foliage of some trees, such as quaking aspen, birch, and hickory, shows only yellow colors. ... CHANGING COLOR...
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www.ces.ncsu.edu/nreos/forest/topics/leafco~1.html
www.ces.ncsu.edu/nreos/forest/topics/leafco~1.html
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Oaks put on their colors long after other species have already shed their leaves. ... Because carotenoids are always present in leaves, the yellow and gold colors remain fairly constant from year to year. ... Why Leaves Change Colors...
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www.na.fs.fed.us/spfo/pubs/misc/leaves/leaves.htm
www.na.fs.fed.us/spfo/pubs/misc/leaves/leaves.htm
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When they are abundant in the leafs cells, as they are during the growing season, the chlorophylls' green color dominates and masks out the colors of any other pigments that may be present in the leaf. Thus the leaves of summer are characteristically green. ... Cluster of leaves change colors...
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www.na.fs.fed.us/spfo/pubs/misc/autumn/autumn_colors.ht...
www.na.fs.fed.us/spfo/pubs/misc/autumn/autumn_colors.htm
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Why Leaves Change Colors ... In the Fall, the decrease in intensity and shorter hours of sunlight and the cooler temperatures cause the leaves to stop their food-making process. The chlorophyll breaks down, the green color disappears, and the yellowish colors or pigments already in the leaf become visible.
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www.stormfax.com/leaves.htm
www.stormfax.com/leaves.htm
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All the hidden colors--the reds, yellows, oranges, and browns can now be seen! ... The green chlorophyll covers up the other colors of the leaf. It covers up the other colors so we can see only green leaves.
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www.tooter4kids.com/autumn/why_do_leaves_change_color.h...
www.tooter4kids.com/autumn/why_do_leaves_change_color.htm
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Evergreens protect their needle-like foliage from freezing with waxy coatings and natural "antifreezes." But broadleaf plants, like sugar maples, birches, and sumacs, have no such protections. As a result, they shed their leaves. ... The colors of carotenoids are easily masked by green chlorophyll, at least until...
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news.nationalgeographic.com/news/2004/10/1005_041008_fa...
news.nationalgeographic.com/news/2004/10/1005_041008_fallfoliage.html
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All articles related to Leaves Changing Colors written by Suite101 experts - enter curious ... Articles related to "Leaves Changing Colors" ... Answers for Kids About Leaves; When summer is over, leaves start changing from green to red, orange, yellow, and brown. Do you wonder why? Here's help to understand why leaves change colors.
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www.suite101.com/reference/leaves_changing_colors
www.suite101.com/reference/leaves_changing_colors
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