Nonlinear responses of plant biomass to aridity. (IMAGE)
Caption
Aridity thresholds for measured (a) aboveground biomass (n = 1353) and (d) root-shoot ratio (n = 3093). Solid red lines represent the linear fits on both sides of each threshold. The red numbers and vertical dashed lines represent the identified aridity thresholds. Plant biomass data were log-transformed to conform to normality. The violin diagrams in panels b and e show bootstrapped slopes of the predicted fitted trend at the threshold of the two regressions existing at each side of the threshold (purple before the threshold, red after the threshold). The violin diagrams in panels c and f show bootstrapped intercepts. The asterisks represent a significant difference before and after the aridity threshold at p < 0.001 using the Mann-Whitney U test.
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