土层(cm) | 退耕年限(a) | ||||||||
1 | 2 | 3 | 4 | 5 | 8 | 15 | 24 | 31 | |
0~10 | 2.55dC | 2.88cC | 2.01dC | 3.60dD | 2.17cC | 3.36dC | 1.58bB | 0.85bA | 1.24bB |
10~20 | 1.74cB | 2.10bB | 1.80cB | 2.68cC | 1.33bB | 2.33cBC | 1.40abAB | 0.68abA | 1.09bB |
20~30 | 1.24bA | 1.47aA | 1.36bA | 2.26bB | 1.18bcAB | 1.86bB | 1.18aA | 0.49aA | 1.06bB |
30~40 | 0.93aA | 1.22aA | 1.08aA | 1.70aA | 0.97aA | 1.29aA | 1.09aA | 0.41aA | 0.79aA |