As leaves begin to change color this fall, scientists are studying how trees and forests are affected by weather and climate conditions. Weather and climate conditions impact when leaves emerge, how much foliage grows, and when leaves begin to fall. The timing of these events as they relate to climate is called “phenology.” For example, a dry summer and early fall can speed-up color change and leaves may fall earlier than usual. A wet early fall may produce less vivid leaf colors and leaves may fall early because of rain and wind storms. Other environmental factors, like damage from insects or wildfire, can also impact tree foliage.
Viewer Tip: You can help scientists study phenology by tracking the timing of leaf emergence, leaf drop and other life-cycle events in your own backyard. Visit the USA National Phenology Network at www.usanpn.org/participate/observe to learn how to observe plants and animals at home and share your data.
