Study on the Variation Characteristics of Soil Enzyme in Man-made Forest of Pinus massoniana at Different Ages

By the method of time-space mutual substitution,the effect of Pinus massoniana at different age on soil enzyme activities and the relationship between soil enzyme activities and soil nutrient contents were tested in red soil hilly region in order to understand the effect of vegetation restoration on soil enzyme activities,bare land and natural secondary forest were selected as references.The results indicated that saccharase,catalase,acid phosphatases and urease were increased significantly with the increasing of stand ages,while polyphenol oxidase decreased.The soil enzyme saccharase,catalase,acid phosphatases,urease and polyphenol oxidase activities which had a significant relationship with soil nutrient could be used as the good biological indicators to evaluate soil quality.The soil enzyme index could indicate the evolution of soil enzyme activities with the increasing restoration age and can be used as a way to assess soil quality.