0–20 cm was lower than that in 20–40 cm in uphill slope and
was higher than that in 20–40 cm in downhill slope under
CK and GB (Table 2, Fig. 2-I and J). Total soil C was significantly
affected by plantation (Table 2). The effect of soil
layer on total soil C was significant: total soil C in 0–20 cm
was higher than that in 20–40 cm (Table 2, Fig. 2-M and N).
Forth, soil NH4
+ concentration was not affected by plantation
(Table 2), whereas it was significantly affected by soil
layer: Soil NH4
+ concentration in 0–20 cm was lower than
that in 20–40 cm (Table 2, Fig. 2-E and F). The interaction of
soil layer and slope was significant: Soil NH4
+ concentration
in 20–40 cm in uphill slope was higher than that in downhill
slope (Table 2, Fig. 2-E and F). Soil NO3
–
concentration was
not influenced by plantation or slope (Table 2). Soil NO3
–
concentration in 0–20 cm was lower than that in 20–40 cm
except NO3
–
concentration in uphill slope under GBH (Table
2, Fig. 2-G and H). The interaction of plantation and
slope was significant, because NO3
–
concentration had an
increase trend along the treatments of CK, GB and GBH in
uphill slope, whereas it had an decrease trend in downhill
slope (Table 2, Fig. 2-G and H). Plantation had significant
effect on total soil N (Table 2). The effect of soil layer on total
soil N was significant: Total soil N in 0–20 cm was higher
than that in 20–40 cm (Table 2, Fig. 2-M and