Fig. 4: Overstory basal area-dependent responses of understory biomass to environmental change drivers.
From: Environmental change shapes understory plant diversity and dominance in boreal forests
a–c Changes in bryophyte biomass in response to climate moisture index, temperature seasonality, and mean temperature; d, e changes in shrub biomass proportion in response to temperature seasonality and precipitation seasonality; f changes in herb biomass proportion in response to solar radiation; g, h changes in bryophyte biomass proportion in response to temperature seasonality and climate moisture index. Colored lines represent the overstory basal area-specific responses, with their bootstrapped 95% confidence intervals shaded in the corresponding color. The overstory basal area was used as the index of canopy density here and analyzed as a continuous variable, but it was illustrated based on the three meaningful levels of breakpoints (mean, mean plus and minus standard deviation (SD)). The significance (P) of the interaction effect between overstory basal area and environmental change drivers is presented. BP: biomass proportion. ΔTemS: temporal changes in annual temperature seasonality; ΔTem: temporal changes in annual temperature; ΔCMI: temporal changes in annual climate moisture index; ΔSA: temporal changes in annual solar radiation. We use two-sided t-test to calculate P-values.
