Fig. 5

Activities of soil invertase (mg released glucose·kg⁻¹ soil·d⁻¹), cellulase (mg reducing sugar·kg⁻¹ soil·h⁻¹), urease (mg released NH₃-N·kg⁻¹ soil·h⁻¹), catalase (ml 25 mol⁻¹ KMnO₄·kg⁻¹ soil·h⁻¹), acid phosphatase (mg hydrolyzed phenol·kg⁻¹ soil·h⁻¹), and polyphenol oxidase (ml 0.05 mol⁻¹ I₂·kg⁻¹ soil·h⁻¹) in the four subtropical forests. NBF, CLP, PMP, and MMP denote an undisturbed native broadleaved forest, C. lanceolata Hook. plantation, P. massoniana Lamb. plantation, and M. macclurei Dandy plantation, respectively. Different letters on the bar denote significance at P < 0.05