Interactive effects of leaf pathogens and plant mycorrhizal type on plant diversity–productivity relationships

Diversity–productivity relationships can differ between forests dominated by different mycorrhizal types and be modulated by specialist and generalist pathogens. However, little is known about how these factors interact to modulate biodiversity effects. We addressed this knowledge gap with a 2-year experiment combining the manipulation of plant richness (1, 2, 4, 8 species) and mycorrhizal type (arbuscular mycorrhizal [AM] tree-dominated; ecto-mycorrhizal [ECM] tree-dominated) with fungicide application (added or control). Biodiversity effects were quantified for community productivity and its two components (shoots and roots). We observed non-linear diversity-productivity relationships, with productivity of ECM-tree dominated communities increasing at low to intermediate diversity and declining at the highest species richness. Fungicide application reduced positive complementarity effects and increased productivity in both ECM tree monocultures as well as 8-species mixtures. This findi..., , , # Interactive effects of leaf pathogens and plant mycorrhizal type on plant diversity–productivity relationships

#### Description of the Data and file structure

This dataset was collected on the basis of an experiment testing the interactive effects of leaf pathogens and mycorrhizal type on plant diversity-productivity relationships. The aim of this study was to address how diversity-productivity relationships are regulated by pathogens and plant mycorrhizal type. The experiment was a full-factor design, with three factors: fungicide treatment (fungicide addition, control), mycorrhizal type of plant community (AM tree-dominated, ECM tree-dominated), and species richness (species number in each community, 1, 2, 4, 8). The experiment was conducted for two years, and at harvest, plant dry biomass was weighed. \"No.\" indicates the number of each pot, and \"composition\" refers to the species composition within each pot, with each value representing a unique composition. RS = root: shoot rati...