Figure 4.

Normalized difference vegetation index (NDVI) of the ambient plots (control and drought) and warming plots (warming and warming + ppt) at each of the three sites from November 2016 to August 2018. Dates of peak biomass are shown with vertical dashed lines and dates of senescence with vertical dotted lines for both 2017 and 2018 (warming in red, ambient in blue). Significance codes: †p < 0.1, *p < 0.05, **p < 0.01, ***p < 0.001; two‐tailed t tests following repeated measures ANOVAs to examine warming effects within each date