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Transcript of Trees
Heartwood: dead xylem; stores food and supports the tree
Sapwood: tube like cells that move water and nutrients from roots to the rest of the tree
Cambium: layer that produces phloem and xylem
Phloem: tube like cells that move sugar (called sap) from leaves to the rest of the tree
Outer bark: dead phloem; protects the rest of the tree. Five Layers of Tree Bark Types and Parts of Trees A tree's trunk is like a highway. It transports water and nutrients from the soil to the leaves. It transports food in the form of sugars from the leaves to the rest of the tree. Trees help cleanse the air by intercepting airborne particles, reducing heat, and absorbing such pollutants as carbon monoxide, sulfur dioxide, and nitrogen dioxide. Trees remove this air pollution by lowering air temperature, through respiration, and by retaining particulates. Erosion control has always started with tree and grass planting projects. Tree roots bind the soil and their leaves break the force of wind and rain on soil. Trees fight soil erosion, conserve rainwater and reduce water runoff and sediment deposit after storms. Trees reduce ozone levels. This effect is not just global, but local. In large cities, a reduction in ozone can mean milder temperatures and more breathable air. Trees provide an ecosystem for animals, insects, and other life. Trees are an important part of many ecosystems. They are not just part of the carbon cycle, but also a home and a food source for many critters. In fact, many animals have a preferred type of tree that they call home, which means every tree is a potential life-saver to certain species. During windy and cold seasons, trees located on the windward side act as windbreaks. A windbreak can lower home heating bills up to 30% and have a significant effect on reducing snow drifts. A reduction in wind can also reduce the drying effect on soil and vegetation behind the windbreak and help keep precious topsoil in place. Shade resulting in cooling is what a tree is best known for. Shade from trees reduces the need for air conditioning in summer. In winter, trees break the force of winter winds, lowering heating costs. Studies have shown that parts of cities without cooling shade from trees can literally be "heat islands" with temperatures as much as 12 degrees Fahrenheit higher than surrounding areas. Trees can reduce heating and air conditioning costs. There is a reason trees tend to be clustered around homes. Homeowners want them there, not just for their shady beauty, but for their effect on temperature. It is well known that trees can absorb summer heat. They also provide shade that can cool a house and yard substantially. In cooler months, trees provide a windbreak and trap heat. A difference of just degrees can save a lot of energy over the course of a year. Real estate values increase when trees beautify a property or neighborhood. Trees can increase the property value of your home by 15% or more. Trees trap dust and debris. Dust, smog, and other particles in the air collect on the leaves and tend to stick there. This creates generally cleaner air for people and animals to breath, which can be important for quality of life in both cities and dusty agricultural areas. As you can see, trees are an important part of keeping our environment healthy. Trees are truly a green part of our world, in more than just color. Humankind needs to wake up, not just to smell the roses but to realize trees are important too.