Driving along the Pikes Peak region’s highways and roads this time of the year, viewers are dazzled by the distant aspen trees cascading down slopes and crossing into meadows. Up close or far away, aspen trees provide the perfect backdrop for wedding or group photos. As green in the summer gives way to an explosion of bright yellow, orange and red in the fall, these vivid leaves provide a brilliant contrast to adjacent evergreens.
The Science of Quaking
Aspens are unique in that their leaves catch the sun on both sides as they “quake.” The quaking, or fluttering, of the leaves makes a sound unique to the aspen tree (scientific name populus tremuloides). The sound comes from wind flow over the specific leaf shape.
Meanwhile, photosynthesis occurs on both sides of the leaves as quaking occurs. The leaves and bark work together to convert light energy, water and carbon dioxide into glucose and oxygen to grow the plant. Bark creates the energy in the winter and leaves contribute in the summer, when light and temperatures are optimal.
A Connected Organism
A group of aspen trees is often referred to as a stand or clonal colony. They are rarely seen alone. Why? Aspen trees spread through their root systems. Every tree in an aspen stand is genetically identical, essentially making them a connected organism. Through the interconnected root system, they can colonize vast areas and even survive disturbances like fires.
Aspens’ underground stems sprout new trunks and form a dense, interconnected community of trees. A stand expands under the right conditions, bringing a burst of color to Colorado’s beautiful forests, meadows and craggy mountainsides.
Trees as Art
Grab your camera or paintbrush. The golden hue of autumn is approaching, when vibrant yellow leaves create a breathtaking display next to white bark and deep blue skies. As the days shorten, orange and red overtake the yellow, carving a stunning spectacle into the ever-present evergreens. A Colorado delight!