3.1 Basic soil properties and enzyme activities
Soil BD, ranging from 1.14 to 1.30 g cm-3, was
significantly increased with slope gradient (p<0.05; Table 1).
Slope position did not affect soil BD. Soil CC
(18.64%~27.23%) was significantly higher at 0º-1.5º
slope gradient than other slope gradients (p<0.05) but did not
change significantly among slope positions. WSA content
(66.67%~82.01%) was significantly lower at 3º-5º and
>5º than other slope gradients but did not change with
slope positions significantly. Soil organic matter increased with the
decrease of slope gradient while there was no difference among slope
positions. Soil pH, CEC, AN, AP, AK, DOC, and TDN were not different
among slope gradients or positions. Either slope gradient or slope
position, but the interaction affected soil MBC and MBN (Table 1). Soil
INV activity decreased with increasing slope gradient. Slope position
did not affect soil INV activity. Soil UR, PHS, and CAT activities were
not different either among slope gradients or among slope positions.
There is no interaction between slope gradient and slope position on
enzyme activities (Table 2).