Abstract: In order to understand the effects of Solanum rostratum invasion on soil micro-ecosystem, and to approach the optimum time of controlling this invasion, this paper studied the soil enzyme activities and fungal diversity in the rhizosphere soil of S. rostratum at its different development stages. Plate method was applied to culture the fungi, and titration method and colorimetric method were adopted to determine the activities of soil catalase, peroxidase, polyphenol oxidase, urease, desaturase, invertase, and protease. A total of 22 genera fungi were identified. From the early growth stage to flowering stage of S. rostratum, the fungal diversity increased significantly, and the enzyme activities varied obviously. Pearson analysis showed that there existed significant relationships between soil fungal diversity and the six soil enzyme activities except for peroxidase from the early growth stage to flowering stage, and principal component analysis showed that the fungal diversity and enzyme activities at the flowering, budding, and four-leaf stages had significant differences with those at the early growth stage of S. rostratum and in the control soil. Therefore, with the growth of S. rostratum, the fungal diversity and enzyme activities in rhizosphere soil changed.

Key words: Seed bank, Spatial pattern, Scales, Fraxinus mandshurica