"Here we report results of a field experiment in which the
number of plant species was experimentally controlled (Fig. 1
legend). Our 147 plots, located on nitrogen-limited soil24, were
planted with either 1, 2, 4, 6, 8, 12, or 24 species. The species
assigned to each plot were chosen by a separate random draw of the
appropriate number of species from a pool of 24 North American
prairie species. The impacts of diversity on plant productivity,
nutrient capture and nutrient...