Elevational Variation in Soil Amino Acid and Inorganic Nitrogen Concentrations in Taibai Mountain, China

The raw data for Fig 1-6. Fig.1. Concentrations of the different extractable N (A), free amino acids (B) and hydrolyzable amino acids (C) in the thirteen sampled elevations. Error bars represent standard error (n=3). Fig. 2. Compositions of soil hydrolyzable amino acids in the thirteen sampled elevations. Error bars represent standard error (n=3). Fig. 3. Elevational variations of the PC1 (A) and PC2 (B) score along a montane gradient. The best-fit lines, F values, goodness of fit (r) and p-values are provided. Fig.4. Simple linear regression of the relationships between the composition of individual amino acids contained in PC1 and elevation. The best-fit lines, F values, goodness of fit (r) and p-values are provided. Fig. 5. Proportions of the neutral, basic, acidic, and sulfur amino acids accounting for soil total hydrolyzable amino acids in the thirteen sampled elevations. Fig. 6. Mean concentrations of soil total N, total hydrolyzable N, hydrolyzable amino acids and un-hydrolyzable N (A), and their corresponding proportions that accounted for soil total N (B) across the thirteen sampled elevations. Error bars represent standard error (n=13).