Fig.2 Relationships of resource availability PC1 scores with (a, c) plant abundance in karst shrubland and woodland, and (b, d) species diversity in karst shrubland and woodland. (c) and (d) included tree and shrub layers of woodland, respectively. Statistical significance of the regression models indicated by * at P < 0.05 and ** at P< 0.01, and gray shading represents 95% credible intervals.