Extended Data Fig. 5: Effect of abiotic factors on drought response.
From: Contrasting drought sensitivity of Eurasian and North American grasslands
Relationships between the response ratio of aboveground net primary productivity and a, historic drought frequency, b, soil moisture, c, mean annual precipitation (MAP), d, coefficient of variation of annual precipitation (CV of AP), e, natural log of the aridity index (AI), f, mean annual temperature (MAT), and g, the amount of annual precipitation removed by the drought treatment. Historic drought frequency, MAP, CV of AP and MAT were calculated based on 37-year historical climate data from 1982 to 2018 for each site, and soil moisture values were observed under the four-year extreme drought plots (see Methods). AI was calculated as MAP/mean annual potential evapotranspiration. Purple and yellow points represent values of Eurasian and North American grasslands, respectively. Fitted lines are from general linear models. The yellow lines indicate the trends across all North American grassland sites and the grey bands indicate 95% confidence interval (see Supplementary Table 2 for detailed model specification and summary statistics).
