Extended Data Fig. 9: Context-dependencies in the soil nitrogen response to warming.
From: Progressive decline in soil nitrogen stocks with warming in a Tibetan permafrost ecosystem
a-d, Mean annual temperature (a), mean annual precipitation (b), soil pH (c) and soil C:N ratio (d) across Arctic, subarctic and Alpine regions. e-h, The single-factor metaregression modes were used to test the association of soil N Hedges’s SMD with these context-specific environmental conditions. In a-d, data are shown as the median values. In e-h, metaregression results are presented as the mean model estimate (solid line) and 95% confidence intervals grey area. Qm refer to the Q value of importance of the environmental and soil variables. Bubble sizes reflect weight of the observation in the metaregression, with larger bubbles denoting greater weights. In h, hollow point is the outlier identified through Boxplot Procedures and thus excluded from the fitting. Abbreviations: C:N ratios, carbon: nitrogen ratios; Hedges’s SMD; the Hedges’ standardized mean difference.
