Graphic summary and mixed effects model (IMAGE) Tsinghua University Press Caption There were significant differences in the key driving factors of aboveground biomass in different spatial degrees. The results of the mixed effects model revealed the effects of tree diversity, environmental factors, stand structure diversity and mycorrhizal dominance on aboveground biomass at different spatial scales and their changing trends. Credit: Rui Zhang, et al. Credit Jianrong Su, Institute of Highland Forest Science, Chinese Academy of Forestry Usage Restrictions News organizations may use or redistribute this image, with proper attribution, as part of news coverage of this paper only. License Original 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.