Tree regeneration is an important process to helps perpetuate a forest. Understanding the frequency of seed production as well as the climatic conditions that promote seed production are important to the management of forests and natural regeneration.
Thirteen permanent research plots were established along an elevational gradient on a range of aspects, slopes, and site productivities on the Fraser Experimental Forest in central Colorado. Trees greater than 10 cm diameter at breast height has been measured periodically over the last 50 years. Seed traps were installed at the beginning of the study in 1968 and have been collected annually since then. In 2011, tree cores were sampled to examine the relationship between climate and seed production.