Trends, p-values, and comparisons of select climate variables from the first 5 yrs (1986-1990) and last 5 yrs (2019-2023) by burn history (not burned and burned after 1999) for focal sagebrush (Artemisia sp.) associations in three US EPA level III ec

The sagebrush associations were derived from Chambers et al. (2023, 2024). The area and frequency of wildfires with extents larger than 405 ha were derived for each sagebrush association using the Monitoring Trends in Burn Severity (MTBS, 2024) burned area boundaries dataset for 1986–2023. Precipitation and temperature values were extracted for each sagebrush association from Daymet climate data (Thornton et al., 2022; https://daymet.ornl.gov). The PET values were calculated at monthly time steps using the Droogers and Allen modification of Hargreave’s equation (Hargreaves, 1994; Droogers and Allen, 2002), and mTMI values were calculated by subtracting the monthly total precipitation from the monthly PET. Descriptions of the climate variables are in "Climate_Variables_Used.xlsx". Trend was the mean marginal trend in each functional type from 1986-2023 for each ecoregion-sagebrush-burn history combination and the p value was the significance of that slope from GLMMs. Mean + SD and delta (Δ) were calculated over all hexcells of a given sagebrush association-ecoregion combination for each functional type and bare ground. Data are based on subsampled data, approximately 500, 20 ha hexcells for each ecoregion-sagebrush-burn combination with more than 20 km2.