PDF(Pubmed)
Abstract：
The relationship between species diversity and biomass/productivity is a major scientific question in ecology. Exploring this relationship is essential to understanding the mechanisms underpinning the maintenance of biodiversity. Positive, negative, and neutral relationships have been identified in controlled experiments and observational research. However, increasing evidence suggests that the effects of species diversity on aboveground biomass and productivity are influenced by biotic and abiotic factors, but it remains unclear whether scale-dependent effects affect aboveground biomass and productivity. Herein, we used a generalized linear regression model and a structural equation model to explore relationships between species diversity and productivity/aboveground biomass under different scales and to investigate the effects of topographical factors and species diversity on ecosystem functioning. The results revealed a positive relationship between biodiversity and ecosystem functioning based on species diversity and aboveground biomass. Different sampling scales may impact the relationship between species diversity and ecosystem functioning. A positive relationship was found between species richness and productivity at medium and large scales; however, ambiguous relationships were found in productivity and other species diversity indices. Elevation was a key factor affecting both biomass and productivity. These results suggest that species diversity is not the only factor affecting biomass and productivity, and the positive correlation between species diversity and ecosystem functioning is mediated by abiotic factors.
摘要：
物种多样性与生物量/生产力之间的关系是生态学中的一个主要科学问题。探索这种关系对于理解维持生物多样性的机制至关重要。阳性,负,在对照实验和观察研究中已经确定了中性关系。然而,越来越多的证据表明，物种多样性对地上生物量和生产力的影响受到生物和非生物因素的影响，但目前尚不清楚规模依赖效应是否会影响地上生物量和生产力。在这里，我们使用广义线性回归模型和结构方程模型来探索不同尺度下物种多样性与生产力/地上生物量之间的关系，并研究地形因素和物种多样性对生态系统功能的影响。结果表明，基于物种多样性和地上生物量，生物多样性与生态系统功能之间存在正相关关系。不同的采样尺度可能会影响物种多样性与生态系统功能之间的关系。在中等和大规模的物种丰富度和生产力之间发现了正相关关系；然而，在生产力和其他物种多样性指数中发现了模糊的关系。海拔是影响生物量和生产力的关键因素。这些结果表明，物种多样性不是影响生物量和生产力的唯一因素，物种多样性与生态系统功能之间的正相关是由非生物因素介导的。
