Data from: The influence of balanced and imbalanced resource supply on biodiversity-functioning relationship across ecosystems

Numerous studies show that increasing species richness leads to higher ecosystem productivity. This effect is often attributed to more efficient portioning of multiple resources in communities with higher numbers of competing species, indicating the role of resource supply and stoichiometry for biodiversity–ecosystem functioning relationships. Here, we merged theory on ecological stoichiometry with a framework of biodiversity–ecosystem functioning to understand how resource use transfers into primary production. We applied a structural equation model to define patterns of diversity–productivity relationships with respect to available resources. Meta-analysis was used to summarize the findings across ecosystem types ranging from aquatic ecosystems to grasslands and forests. As hypothesized, resource supply increased realized productivity and richness, but we found significant differences between ecosystems and study types. Increased richness was associated with increased productivity, although this effect was not seen in experiments. More even communities had lower productivity, indicating that biomass production is often maintained by a few dominant species, and reduced dominance generally reduced ecosystem productivity. This synthesis, which integrates observational and experimental studies in a variety of ecosystems and geographical regions, exposes common patterns and differences in biodiversity–functioning relationships, and increases the mechanistic understanding of changes in ecosystems productivity.大量研究表明，物种丰富度提升会提升生态系统生产力。该效应通常被归因于竞争物种更多的群落中多种资源的分配效率更高，这揭示了资源供给与生态化学计量学（ecological stoichiometry）在生物多样性-生态系统功能关系中的作用。本研究将生态化学计量学理论与生物多样性-生态系统功能研究框架相结合，旨在解析资源利用如何转化为初级生产。本研究采用结构方程模型（structural equation model），针对可利用资源界定多样性-生产力关系的模式特征。本研究通过元分析（Meta-analysis）整合了涵盖水生生态系统、草原与森林在内的多种生态系统类型的研究结果。正如研究假设所示，资源供给提升了实际生产力与物种丰富度，但本研究发现不同生态系统及研究类型间存在显著差异。物种丰富度提升与生产力提高呈正相关，但该效应在实验研究中并未观测到。群落物种多度分布越均匀，其生产力反而越低，这表明生物量生产通常由少数优势物种维持，而优势度降低通常会削弱生态系统生产力。本综合研究整合了不同生态系统与地理区域的观测及实验研究，揭示了生物多样性-生态系统功能关系的共性模式与差异，并提升了对生态系统生产力变化的机制性认知。