Fig. 2 Mean growing season community biomass at the study site between 1981 and 2011 (n = 10, with standard deviation)
The relative biomass of functional group PF decreased from 1981 to 2011 (Fig. 3c, P = 0.015; R2 = 0.20). The relative biomass of the other functional groups fluctuated inter-annually, but did not show any trend through time (Fig. 3a-b, d-e). The relative biomass of the dominant species also fluctuated during the observation period, but there was no significant trend through time (Fig. 3f).