Spruce Regeneration Plots (IMAGE) University of Alaska Fairbanks Caption The rectangular plots of dark green vegetation in this 2014 aerial photograph show white spruce thriving in the forest regression test area established almost 30 years earlier. Credit Photo by Ryan Jess Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.