Table 4: Comparison of soil carbon storage in different stands (mean ± SD, = 30).

Soil layerTotal
0–10 cm10–20 cm20–30 cm30–40 cm40–50 cm50–60 cm

UR (t·hm−2) 91.59a
CK (t·hm−2) 129.47b
Difference relative to CK (%)37.58 43.45 28.80 22.54 10.21 1.98 29.26
Annual variation (t·hm−2·y−1)−0.32 −0.24 −0.11 −0.08 −0.03 −0.01 −0.79

Values within the same column with different lowercase letters are significantly different at .
Values within the same column with different uppercase letters are significantly different at .