Trees, Air, and Water

When I ask kids why trees important, the number one answer is that they produce oxygen, which is correct of course. Leaves are solar collectors that  produce food the tree needs through the miracle of photosynthesis, a complex chemical process where carbon dioxide and water are converted to a glucose sugar. This sugar is used for food energy, or converted to a starch called cellulose for building the trunk and branches (wood).  It requires a lot of energy to sustain large plants, so trees must have huge canopies of branches to hold thousands of leaves to the sun.   If the leaves of one mature sugar maple tree were laid out flat they would cover one half acre of ground.


A byproduct of photosynthesis is oxygen, crucial as mentioned to all air breathers.  A healthy, rapidly growing tree can produce 6-8 pounds of oxygen each year.  As trees age they grow slower and contribute less oxygen.  Very old  trees produce only about as much oxygen as they themselves need to convert food to energy.


Trees take carbon dioxide from the atmosphere and convert it to wood.  There’s a rule of thumb that to make a ton of wood, a tree takes in two tons of carbon dioxide and releases 1 ton of oxygen.  Trees are considered important “carbon storage units”, taking up and storing huge amounts of carbon dioxide that is presently being overproduced by automobiles, factories, and coal burning.  Excess carbon dioxide is causing the dreaded “greenhouse effect”, warming the climate with uncertain consequences.


Trees also use a lot of water to run the photosynthesis process.  Certain species can raise water high into the canopy at speeds of up to 150 feet per hour.  A large leafy tree can take up 95 gallons of water each day, but only a small percentage of it is actually converted to glucose.  The rest is released through the leaves into the atmosphere as water vapor, where it forms clouds and eventually returns to earth as rain.


There are concerned people who feel trees are so important to our environment that they should not be cut for lumber, fuel, or paper.   The products derived from wood are many and a big part of our modern lifestyle.  What is important to remember is that through proper forest management trees can grow back and replace trees cut, and assures that there will be enough wood for human use while still allowing the important ecological benefits of trees to remain intact. For more information on trees, their management and benefits, contact your local state forestry office..

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