Fig. 3

Distribution of SIC and SOC contents by soil profile for ZX, NT, and RS. Error lines show how the same plant at the same site differs in SOC and SIC. Significant changes in SIC and SOC contents of ZX, NT, and RS in the same soil layer are represented by various lower case letters (P < 0.05). a, b, c denote the SOC content of ZX, NT, and RS, and d, e, f denote the SIC content of ZX, NT, and RS, respectively