Spruce (<i>Picea abies</i>) Forest (IMAGE) University of Bern Caption Conifer forests are often planted for timber production and have low structural heterogeneity (both vertical and horizontal). Credit © Springer Nature, Picture by Peter Manning Usage Restrictions The image may only be used with appropriate caption or credit. 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.