In tropical plantations, nutrients such as nitrogen (N) or phosphorus (P) are often applied as management practices. However, the effects of such nutrient additions on topsoil C- and N-acquiring enzymes activities are unclear. In this study, the impacts of fertilization on β-1,4-glucosidase (BG), β-D-cellobiosidase (CBH), β-1,4-xylosidase (BX), β-1,4-N-acetyl-glucosaminidase (NAG), and leucine amino peptidase (LAP) enzymes activities from topsoil and litter layer of two tropical plantations (Acacia auriculiformis and Eucalyptus urophylla) were measured. The results showed that N addition had neutral impact on topsoil enzymes, while significantly elevating the activities of BG, CBH, BX, and NAG in the litter layer. P fertilization had no impacts except for an elevation of NAG in litter sample. There was no interactions found between N and P additions on these enzyme activities. The clearer impacts of N over P fertilization were unexpected because that the study site receives a high rate of atmospheric N deposition, and has low soil P availability. The impact of P fertilization on hydrolytic enzyme activities may be less important compared with that of N.