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Authored by: jesse on Friday, September 21 2012 @ 07:39 PM EDT |
As their seed hulls are too thick to open unless they are heated, causing them
to split - now the plant seed inside can grow.
Oak trees drip tannic acid (along with their leaves) under their branches to
prevent other trees and plants from growing there and taking up light/nutrients.[ Reply to This | Parent | # ]
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Authored by: Wol on Friday, September 21 2012 @ 08:25 PM EDT |
But grass dries and burns in such a way as to kill most other plants, while it
survives unharmed.
When grasses first appeared, the Savannah was wooded. Now there are few trees
there - when the grass alights it kills pretty much anything.
There was an interesting program about this - how the maximum temperature in a
grass fire is about 18" above the ground - perfectly placed to scorch and
kill most herbaceous plants.
Cheers,
Wol[ Reply to This | Parent | # ]
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