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

Fig 1.
Concentrations of the different extractable N forms (A), free amino acids (B) and
different hydrolyzable N forms (C) in the thirteen sampled elevations. Error
bars represent standard error (n=3).

Fig
2. Concentrations of soil individual 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. Elevational variations of the proportion
of hydrolyzable amino acids that accounted soil total N content across the
thirteen sampled elevations. The best-fit lines, F values, goodness of
fit (r) and p-values are provided.