are planting . . . TREES OF STRENGTH
Benefits of Trees
We plant trees primarily for their beauty and to provide shade but
they do create many other benefits. Trees can sooth and relax us and
help us connect to nature and our surroundings. The color green -
is a calming, cool color that helps your eyes quickly recover from
strain. By planting and caring for trees, you help improve your surrounding,
reduce pollution, lower energy costs, improve the appearance of your
community and increase the value of your property.
Trees can reduce air temperature by blocking sunlight.
Further cooling occurs when water evaporates from the leaf surface.
The conversion of water to air vapor --- a chemical process --- removes
heat energy from the air.
- A tree can be a natural air conditioner. The evaporation from a single
tree can produce the cooling effect of 10 room size air conditioners
operating 20 hours a day.
- You can improve the efficiency of your heat pump by shading it with
- Deciduous trees block sunlight in the summer but allow sunlight to
reach and warm your home in the winter ---- place deciduous trees on
the south and west sides of your home.
- Trees can shade hard surface areas such as driveways, patios, building
and sidewalks thus minimizing landscape heat load -- a build up of heat
during the day that is radiated at night resulting in warmer temperatures.
Ideally, 50 percent of the total paved surface should be shaded.
- Evergreen trees can be used to reduce wind speed and thus loss of
heat from your home in the winter by as much as 10 to 50 percent.
- Trees absorb and block noise and reduce glare. A well placed tree
can reduce noise by as much as 40 percent.
Fallen tree leaves can reduce soil temperature and
soil moisture loss. Decaying leaves promote soil microorganism and
provide nutrients for tree growth.
- Trees help settle out and trap dust, pollen and smoke from the air.
The dust level in the air can be as much as 75 percent lower on the
sheltered side of the tree compared to the windward side.
- Trees create an ecosystem to provide habitat and food for birds and
- Trees absorb carbon dioxide and potentially harmful gasses, such
as sulfur dioxide, carbon monoxide, from the air and release oxygen.
One large tree can supply a day's supply of oxygen
for four people.
A healthy tree can store 13 pounds of carbon
each year ----for an acre of trees that equals to 2.6 tons of
Each gallon of gasoline burned produces almost
20 pounds of carbon dioxide.
For every 10,000 miles you drive, it takes 7
trees to remove the amount of carbon dioxide produce if your car
gets 40 miles per gallon (mpg); it will take 10 trees at 30 mpg;
15 trees at 20 mpg; 20 trees at 15 mpg; and 25 trees at 12 mpg)
Trees help reduce surface water runoff from storms,
thus decreasing soil erosion and the accumulation of sediments in
streams. They increase ground water recharge and reduce the number
of potentially harmful chemicals transported to our streams.
- An acre of trees absorb enough carbon dioxide in a year to equal
the amount produced when you drive a car 26,000 miles.
- Trees cool the air, land and water with shade and moisture thus reduce
the heat-island effect of our urban communities. The temperature in
urban areas is often 9 degrees warmer than in areas with heavy tree
- Trees can help offset the buildup of carbon dioxide in the air and
reduce the " greenhouse effect."
- Trees create microclimates suitable for growing shade loving plants.
- The American Forestry Association estimates that 100 million new
trees would absorb 18 million tons of carbon dioxide and cut US air
conditioning costs by $4 billion annually.
- Dews and frosts are less under tree because less radiant heat is lost
Personal and Social Benefits
- Trees are the least expensive plants you can add to your landscape
when you consider the impact they create due to their size.
- A tree can add music to your life by attracting birds and other animals.
- A tree can provide pleasant smells. A cherry tree can perfume the
air with 200,000 flowers.
- Hospital patients have been shown to recover from surgery more quickly
when their hospital room offered a view of trees. They also had fewer
complaints, less pain killers and left the hospital sooner.
- Most of us respond to the presence of trees beyond simply observing
their beauty. We feel serene, peaceful, restful and tranquil in a grove
of trees. We are "at home" there.
- Trees provide us with color, flowers, fruit, interesting shapes and
forms to look at.
- Trees can screen unattractive views, soften the sometimes harsh outline
of masonry, metal, asphalt, steel, and glass.
- Trees can seperate and define space thus providing a sense of privacy,
solitude and security, and create a feeling of relaxation and well being.
Trees can serve as a living legacy for the next generation
- thus linking us to near and distant generations
- Lowered electricity bills are paid by customers when power companies
build fewer new facilities to meet peak demands, use reduced amounts
of fossil fuel in their furnaces and need fewer measures to control
Trees can help direct pedestrian traffic, provide
background and thus enhance the appearance of other landscape plants
and our homes.
- Trees help people reflect positively on life' changes.
Trees have been reported as having a relaxing effect
on students studying for exams.
- Studies have documented that urban vegetation can result in slower
heartbeats, lower blood pressure and more relaxed brain wave patterns.
Sound waves are absorbed by tree leaves and branches.
A belt of trees 100 feet wide and 45 feet high can reduce highway
noise by 50 percent. Prolonged exposure to noise can cause hypertension,
higher cholesterol levels, irritability and aggressive behavior.
- Trees can create lasting impression on how a community is perceived
by visitors and affect the mood and community pride of its residents.
- Trees can enhance community economic stability by attracting businesses
and tourists -----people linger and shop longer when trees are present.
Apartments and offices in wooded areas rent quicker
and have a higher occupancy rate --- workers in offices in wooded
areas report more productivity and less absenteeism.
Property values of landscaped homes are 5 to 15%
higher than those of non-landscaped homes and homes are quicker
to resell than homes without trees.
Trees increase the humidity in the air, help increase
ground water recharge, reduce soil erosion and storm water run-off
thus reducing the amount of water we consume and the need for new
water treatment plant and storm water structures. A study in Salt
Lake City revealed the tree canopy reduced surface runoff by 11.3
million gallons following a 1 inch rain.
The feeling of community pride created by trees
can help reduce crime.
By reducing heating and cooling cost, trees can
reduce our dependance on oil and natural gas.
By absorbing and deflecting falling rain, trees
can reduce the severity of floods.
By reducing carbon dioxide, dust and other potentially
harm gasses in the air, our air quality is improved through lower
levels of ozone, carbon monoxide and sulfur dioxide.
Trees make communities livable for people and their
activities. People walk and jog more on streets with trees; children
and adults have a cool place to play or relax in the summer, thus
increasing their interaction with neighbors.
Compiled by: Erv Evans
Web Design by: Mark Dearmon
Trees of Strength is a registered service mark of NC State University.