Data analysis
One-way analysis of variance was conducted to identify differences in environmental traits and functional traits. The normality was tested prior to one-way analysis. A logarithmic transformation was necessary to meet the statistical requirement because the data were not normally distributed. Redundancy analysis (RDA), a multivariate direct gradient analysis method, was performed using the Canoco 5.0 software to elucidate the relationship between functional traits and soil environmental factors based on standardized data. The primary statistical analyses, functional traits relationship, partial correlation and curve estimation were performed using SPSS 20.0 (SPSS Inc., Chicago, IL, USA). The CSR model was calculated by the globally calibrated CSR analysis tool ‘StrateFy’ and the picture was output by R (R Development Core Team 2013). Figures were plotted using Origin Pro 8.0 (Originlab Co., Northampton, MA, USA).
RESULTS