<p>Mean ± SE for the Box-Cox transformed above-ground biomass (<i>a</i> and <i>b</i>) and below-ground biomass (<i>c</i> and <i>d</i>) of experiment I and for the Box-Cox transformed above-ground biomass for experiment II (<i>e</i> and <i>f</i>). The <i>x</i>-axis label on the left column is the number of species. Experiment I had 2 richness levels (1 and 8 species). Experiment II had four richness levels (1, 2, 4 and 8 species).</p
