土层(cm) | 退耕年限(a) | ||||||||
1 | 2 | 3 | 4 | 5 | 8 | 15 | 24 | 31 | |
0~10 | 0.60bB | 0.63cC | 0.54cC | 0.57aA | 0.53bB | 0.52bB | 0.45cC | 0.48dD | 0.23bA |
10~20 | 0.61bB | 0.61bBC | 0.43bB | 0.56aA | 0.42bAB | 0.51bB | 0.36bB | 0.27cC | 0.13aA |
20~30 | 0.55bB | 0.56aAB | 0.26aA | 0.53aA | 0.41bAB | 0.43aA | 0.16aA | 0.19bB | 0.12aA |
30~40 | 0.43aA | 0.51aA | 0.20aA | 0.53aA | 0.34aA | 0.41aA | 0.13aA | 0.13aA | 0.24bA |