Tree line is a concept of ecology, environmental science and geography. It refers to the boundary separating whether plants can grow due to climate, environment and other factors. Within this line, plants can grow as usual; However, once the line is crossed, most plants will be unable to grow due to wind, water, soil or other climatic reasons.
It is usually a very dramatic transformation from a forest on a hillside to a treeless tundra. In a place with a vertical distance of only a few tens of meters, the life form of trees disappears and is replaced by low shrubs, herbs and pasture. This rapidly changing area is called a tree line.
According to the causes and locations of the forest line, the forest line can be divided into alpine forest line (i.e. alpine forest line), desert forest line, alpine desert forest line, Arctic forest line and Antarctic forest line. The boundary of the forest line is often changed by climate change.