Yep, all 3 play a part in a trees survival. They do put Co
2 back into the atmosphere as well ... just happens they put more o
2 so they're beneficial.
Here's a great site on it.
http://www.emc.maricopa.edu/faculty/...hotosynthesis? http://www.sciencedaily.com/releases...0112035906.htm Quote:
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Trees have long been known to lift water from the soil to great heights using a principle called hydraulic lift, with energy supplied by evaporation of water from leaf openings called stomata. Twenty years ago, however, some small plants were found to do more than lift water from the soil to the leaves - they also lifted deep water with their tap root and deposited it in shallow soil for use at a later time, and reversed the process during the rainy season to push water into storage deep underground. Dawson discovered in 1990 that trees do this, too, and to date, so-called hydraulic redistribution has been found in some 60 separate deeply rooted plant species.
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http://www.answers.com/topic/photorespiration http://www.sciencedaily.com/releases...0723093305.htm