. 2015 Jun 23;5:11409. doi: 10.1038/srep11409

Table 2. Average values of δ¹³C in SOC for each layer at the three LTE sites.

Layer	Urumqi	Yangling	Zhengzhou	Mean
0–20	−21.83 Aa^*	−21.97 Ba	−22.59 Bb	−22.13 (34.8)^**C
20–40	−21.90 Aa	−21.53 Ba	−22.49 Bb	−21.97(35.9) BC
40–60	−21.58 Aa	−21.57 Ba	−21.87 Aa	−21.68 (38.0) AB
60–80	−21.63 Aa	−21.56 Ba	−21.93 Aa	−21.71 (37.8) AB
80–100	−21.91 Ab	−20.96 Aa	−21.68 Ab	−21.52 (39.2) A

^*Values followed by the same letter (lower case letter within a row or upper case letter within a column) are not significantly different at P ≤ 0.05 based on LSD test.

^**Percentage of maize derived SOC

Table 2. Average values of δ13C in SOC for each layer at the three LTE sites.

Table 2. Average values of δ¹³C in SOC for each layer at the three LTE sites.