A cross‐scale assessment of productivity–diversity relationships

作者：Dylan Craven, Masha T. van der Sande, Carsten Meyer, Katharina Gerstner, Joanne M. Bennett, Darren P. Giling, Jes Hines, Helen R. P. Phillips, Felix May, Katherine H. Bannar‐Martin, Jonathan M. Chase, Petr Keil · 发表于：Global Ecology and Biogeography · 年份：2020 · DOI：10.1111/geb.13165 · 被引用次数：63 · 研究领域：Ecology and Vegetation Dynamics Studies、Species Distribution and Climate Change、Land Use and Ecosystem Services

Abstract Aim Biodiversity and ecosystem productivity vary across the globe, and considerable effort has been made to describe their relationships. Biodiversity and ecosystem functioning research has traditionally focused on how experimentally controlled species richness affects net primary productivity ( S → NPP) at small spatial grains. In contrast, the influence of productivity on richness (NPP → S ) has been explored at many grains in naturally assembled communities. Mismatches in spatial scale between approaches have fuelled debate about the strength and direction of biodiversity–productivity relationships. Here, we examine the direction and strength of the influence of productivity on diversity (NPP → S ) and the influence of diversity on productivity ( S → NPP) and how these vary across spatial grains. Location Contiguous USA. Time period 1999–2015. Major taxa studied Woody species (angiosperms and gymnosperms). Methods Using data from North American forests at grains from local (672 m 2 ) to coarse spatial units (median area = 35,677 km 2 ), we assess relationships between diversity and productivity using structural equation and random forest models, while accounting for variation in climate, environmental heterogeneity, management and forest age. Results We show that relationships between S and NPP strengthen with spatial grain. Within each grain, S → NPP and NPP → S have similar magnitudes, meaning that processes underlying S → NPP and NPP → S either operate simultan...