Data S1 Supplementary information of method.

Appendix S1 Data source.

Figure S1 Residual vs. fitted plots in leaf traits–climate relationship.

Figure S2 Leaf morphological traits across latitude and climates.

Figure S3 Leaf toughness per density across latitude and climates.

Figure S4 Relationship between leaf toughness per density and fibre content.

Table S1 Comparison of different shearing devices.

Table S2 Correlation test between leaf traits and climate variables.

Table S3 Partitioning of variance in structural resistance for individual studies.

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