3.2 Effects of deforestation and land restoration on SOC, TN
storage and soil bulk density
The mean response ratio (lnRR ) was weighted by the mean value and
standard deviation of each sample. Before meta-analysis, we tested the
data normality using the Shapiro-Wilk test (Shapiro and Wilk, 1965).
Overall, the lnRR of SOC, TN storages and soil mass were normally
distributed (Table 2), regardless of deforestation or land restoration.
The data showed that LUCC had remarkable influence on SOC, TN storage
and soil mass (P < 0.05). On the one hand,
deforestation had negative effects on SOC and TN storages (lnRR< 0; P < 0.5), indicating that deforestation
caused huge SOC and TN losses. Specifically, the lnRR of SOC and
TN storage were -0.66 and -0.62, respectively, which means that
deforestation caused a loss of 48.3% for SOC and 46.2% for TN
respectively. On the other hand, after land restoration, the lnRRof SOC and TN storage were 0.27 and 0.19, which indicates that land
restoration increased SOC and TN storage by 31% and 20.9% in the Karst
areas. In addition, the lnRR of soil mass after deforestation was
0.09, and the lnRR after land restoration was -0.04,
demonstrating that both deforestation and land restoration had great
impacts on soil bulk density (Table 2).