Table 1.
Trait means for each functional group.
Figure 1.
Rainfall applied to treatments during the measurement period of the experiment.
Significant differences in soil moisture between precipitation treatments are represented by asterisks * = p<0.05, ** = p<0.01, *** = p<0.001.
Table 2.
Total seasonal rainfall inputs throughout the experiment.
Table 3.
Results of linear mixed effects models testing precipitation change (PC) and functional group (FG) treatment effects upon vegetation cover and species richness.
Figure 2.
Effect of precipitation change and functional identity on decomposition of Holcus mollis at different time points.
Decomposition of H. mollis litter in 2009 for all fourteen treatments. a) Dec–Mar F1,49 = 32.87, p<0.001, b) Dec–Jun F1,49 = 40.23, p<0.001, c) Dec–Sept F1,49 = 20.31, p<0.001. Error bars represent ±1 SEM.
Table 4.
Summary of treatment effects upon decomposition from mixed effects models.
Figure 3.
Effect of precipitation change and functional identity on photosynthetic rate at different time points.
The response of photosynthetic rate to precipitation change (PC) and functional group (FG) identityat four time points through the experiment. a) March 2009 (presence/absence of FG1, F1,42 = 9.152, p = 0.004), b) November 2009 (interaction between PC and FG1, F1,42 = 4.831, p = 0.033), c) June 2010 (presence/absence of FG2, F1,42 = 4.610, p = 0.037), d) July 2010 (interaction between PC and FG1, F1,42 = 5.552, p = 0.004). Error bars represent ±1 SEM.
Figure 4.
Effect of precipitation change and functional identity on ecosystem respiration at different time points.
The response of ecosystem respiration to precipitation change (PC) and functional group (FG) identity at six time points through the experiment. a) May 2009 (presence/absence of FG1 F1,42 = 4.72, p = 0.036, interaction between FG2 and FG3, F1,42 = 5.031, p = 0.03), b) September 2009 (PC F1,42 = 4.596, p = 0.038), c) November 2009, (interaction between PC and FG3 F1,42 = 7.165, p = 0.010), d) February 2010 (FG1, F1,45 = 4.521, p = 0.039), e) June 2010 (interaction between PC and FG1, F1,45 = 5.80, p = 0.020) f) August 2010 (interaction between PC and FG1 F1,45 = 6.46, p = 0.015).
Table 5.
Results of linear mixed effects models, testing precipitation change (PC) and functional group(FG) treatment effects upon carbon and water fluxes.
Figure 5.
Effect of precipitation change and functional identity on extractable soil P in different seasons.
The response of soil extractable P to precipitation change (PC) and functional group (FG) identity in each season. a) Spring (presence/absence of FG1, F1,154 = 14.1, p = 0.0003, interaction between PC and FG2, F1,45 = 6.88, p = 0.0096), b) Summer (NS), c) Autumn (NS), d) Winter (interaction between PC and FG2 F1,45 = 5.005, p = 0.0303).
Table 6.
Results of linear mixed effects models testing precipitation change (PC) and functional group (FG) treatment effects uponseasonal soil extractable nutrient concentrations.