Fig. 3
Effect of aridity on GDDreq spatial variance. Variation of the interquartile (iqr) of the long-term (1970–2016) heat requirement (GDDreq, estimated as the sum of temperatures > 5 °C between 1 January and the LU date) as a function of the ratio of actual to potential evapotranspiration (αE). Low αE values indicate drought conditions during the growing season. The black line represents the iqr of GDDreq when considering all sites and species. See Supplementary Fig. 4 for the distribution of GDDreq values along αE. Source data are provided as a Source Data file.
