Figure 1.
Sample sites (filled red pentagram) of this study at Yunwu Mountain and Ziwuling Mountain.
Figure 2.
The difference in bulk density at secondary forest (SF-1, SF-2) and restored grassland (RG-1, RG-2).
Error bars are standard error (plot to plot and depth to depth, N = 6).
Figure 3.
The difference in soil organic carbon (SOC) content.
SF-1 and SF-2 are sites of secondary forest while RG-1 and RG-2 are sites of restored grassland. Different lower-case letters denote significant differences among depths within an individual study site; different upper-case letters denote significant differences among vegetation restoration types (P<0.05) (plot to plot and depth to depth, N = 6).
Figure 4.
The difference in soil C/N ratios among sites (a) and depths (b).
SF-1 and SF-2 are sites of secondary forest while RG-1 and RG-2 are sites of restored grassland. Error bars are standard error (plot to plot and depth to depth, N = 6).
Table 1.
Soil organic carbon (SOC) storage (± standard deviation) at sites secondary forest (SF-1 and SF-2) and restored grassland (RG-1 and RG-2).
Figure 5.
Changes in soil δ13C values with depth and vegetation restoration types.
SF-1 and SF-2 are sites of secondary forest while RG-1 and RG-2 are sites of restored grassland. Error bars are standard error (plot to plot and depth to depth, N = 6).
Figure 6.
Variation of carbon isotope fractionation factors (α) at different depth among study sites.
SF-1 and SF-2 are sites of secondary forest while RG-1 and RG-2 are sites of restored grassland. Error bars are standard error (plot to plot and depth to depth, N = 6).
Figure 7.
Relationship between soil δ13C values and soil organic carbon (SOC) content.
SF-1 and SF-2 are sites of secondary forest while RG-1 and RG-2 are sites of restored grassland.