File:Tree Rings.PNG

Tree Rings
Temüjin had learned from the Mother Earth about the old trees of Orkhon Valley provide a living history book of the climate. Tree rings are a good place to understand about the climate. Trees can live for hundreds—and sometimes even thousands—of years. Over this long lifetime, a tree can experience a variety of environmental conditions: wet years, dry years, cold years, hot years, early frosts, forest fires and more.

A tree grows best during warm, wet weather. Each year a ring of wood is added to the sapwood in the trunk of a tree and to every branch. When the weather gets cold in late autumn and winter, the tree stops growing. It begins to grow again the following spring when the weather begins to get warm again.

Each year, trees add a layer of growth between the older wood and the bark. This layer, or ring as seen in cross-section, can be wide, recording a wet season, or narrow, recording a dry growing season. Because the rings are basically recording a good growing season or a bad growing season, they are indirectly recording more than just moisture. They also document temperature and cloud cover as they impact tree growth as well. This record of annual summer information is very important when you consider that certain types of trees grow slowly over hundreds and hundreds of years, and therefore contain a record of as many years of climate and climate change.

If you’ve ever seen a tree stump, you’ve probably noticed that the top of a stump has a series of concentric rings. These rings can tell us how old the tree is, and what the weather was like during each year of the tree’s life. The light-colored rings represent wood that grew in the spring and early summer, while the dark rings represent wood that grew in the late summer and fall. One light ring plus one dark ring equals one year of the tree’s life.,,,Read "Khan the Great and know more about Tree Rings....Sivkishen Ji, Author