time for another force fact break brought to you by the organ Forest Resources Institute today's topic tree biology treaties like all plants need sunlight to grow along with water and nutrients the use the sunlight to make their own food through photosynthesis for this process the tree take than carbon dioxide from the air and uses it to grow bigger and stronger releasing oxygen in the process now you probably know the basic parts of a tree the real truck crown and the leaves are need of but what's going on in there inside will show you a typical tree has five layers and its trunk first the bark the park is like a protective jacket for the tree under the bark is the phloem isn't a this is also known as the in her back it transport fat and sugars from the needles and leaves to nourish the restive the tree next comes the cambium this is the growing part of the truck on one side it creates new with self on the other it creates new park under the cambium is the sideline the violin is made above Youngwood it's the superhighway water in nutrients from the roots to the rest to the tree finally the heartwood this is the part to give the tree its rigid structure although this what is technically dead the tree would have a hard time surviving without it as long as we're looking inside the tree take a look at a cross section of a tree we all know you can tell the truth age by counting its range but why do trees hampering in the spring when sunlight and water are abundant trees grow quickly adding big new web self it's the light part of the brain in the summer the tree's growth slows and ads fewer and smaller South if the dark part of the Ring together the light and dark areas add up to one year of growth so the Rings really show you when the tree was growing quickly and when it was taking it easy and that's a quick look at tree biology check out more forced back brakes or visit Oregon forest.org yea forests
