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Appendix S1 Measurement error of elemental concentrations in grassland soils across northern China.

Appendix S2 Semivariance models used to interpolate the spatial distributions of topsoil C : N : P ratios across China's grasslands.

Appendix S3 Frequency distributions of the difference between interpolated and measured topsoil C : N : P ratios across China's grasslands.

Appendix S4 Spatial patterns of kriging variance in topsoil C : N : P ratios across China's grasslands.

Appendix S5 Changes in topsoil organic content (SOC), total nitrogen (TN) and total phosphorus (TP) concentrations across China's grasslands over the sampling interval.

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