What happens to trees from one life zone to the next?

As altitude increases, the types of trees that thrive in different life zones change due to variations in climate, temperature, soil composition, and moisture levels. Typically, certain species are adapted to specific conditions found at lower elevations, and as one ascends in altitude, these conditions shift. This means that some tree species that flourish at one altitude may struggle or completely disappear at higher elevations where the environment becomes less suitable for them.

For instance, at lower elevations, you might find species such as piñon pine or juniper, which prefer warmer and drier conditions. As altitude increases, tree species that can survive in colder and harsher environments, such as spruce or fir, become more prevalent. Consequently, a variety of trees, particularly those that are not tolerant of cooler temperatures or shorter growing seasons, will indeed disappear as one moves into higher life zones. This illustrates the concept of bioclimatic zones and how ecosystems are stratified based on altitude.