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).