COVER PHOTO: Biodiversity–ecosystem functioning (BEF) experiments can be used to better understand the mechanisms behind diversity and ecosystem functions relationships. The BEF-China tree diversity experiment site is pictured here during early morning in September 2019. Beugnon et al. (Article e1563; doi:10.1002/ecm.1563) studied the mechanisms behind tree diversity effects on microbial biomass and soil carbon concentration at this site. Their results highlight strong effects of forest diversity on soil microbial biomass and carbon by driving forest productivity, tree functional traits, and micro-environmental conditions. Photo credit: Rémy Beugnon.

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封面图片：生物多样性-生态系统功能 (BEF) 实验可用于更好地了解多样性和生态系统功能关系背后的机制。图为 2019 年 9 月清晨的 BEF-China 树木多样性试验场。Beugnon 等人。（文章 e1563；doi:10.1002/ecm.1563）研究了该地点树木多样性影响微生物生物量和土壤碳浓度的机制。他们的研究结果强调了森林多样性通过推动森林生产力、树木功能特性和微环境条件对土壤微生物生物量和碳的强烈影响。图片来源：Rémy Beugnon。