3.2 Variation of SIC density with stand age
The statistical results of SIC density in different stand ages are shown in Table 2. The variation of SIC density for MS, 5yrs, 11yrs, 22yrs, and 46yrs ranged from 0.37 ~ 0.57 kg m-2、0.51 ~ 1.05 kg m-2、0.59 ~ 1.08 kg m-2、0.60 ~ 1.28 kg m-2, and 0.68 ~ 1.35 kg m-2。It can be seen from the mean values that SIC density showed an overall increasing trend with stand age.
Tab. 2 Descriptive statistics of SIC density at 0 ~ 300 cm depth