图2. 不同林分土壤环境因子对土壤酶活性影响的冗余分析(RDA)。SF1、SF2、SF3表示米槠次生林样地的3个平行重复; AR1、AR2、AR3表示米槠人工促进天然更新林样地的3个平行重复; PM1、PM2、PM3表示马尾松人工林样地的3个平行重复; DON,可溶性有机氮; DOC,可溶性有机碳; SOC, 土壤有机碳; TN, 总氮。图右下角变量注释表示对土壤酶变化有显著影响作用的环境因子的相应解释比例。

Fig. 2. Redundancy analysis (RDA) of the effect of soil environmental factors on soil enzyme activity in different forest types. SF1, SF2, SF3 represent three parallel replicates of the secondary broadleaved forests of Castanopsis carlesii plot; AR1, AR2, AR3 represent three parallel replicates of the Human-assisted naturally regenerated forests of Castanopsis carlesii plot; PM1, PM2, PM3 represent three parallel replicates representing the Human-assisted naturally regenerated forests of Pinus massoniana plots of Pinus massoniana plantation. DON, dissolved organic nitrogen; DOC, dissolved organic carbon; SOC, soil organic carbon; TN, total nitrogen. The notes of variables in lower right corner of the plot represents the corresponding proportion of environmental factors that have a significant effect on soil enzyme changes.