Fig. 1. Biplot created by principal component analysis (PCA) using compositional proportions (> 1%) of VOCs from plant species. Xn represents the chemical number assigned to each VOC in
Table 2. VOCs: volatile of organic compounds; AF:
Amorpha fruticosa; DL:
Diospyros lotus; LJ:
Lonicera japonica; CS:
Corydalis speciosa; AA:
Ailanthus altissima; CC:
Castanea crenata; DK:
Diospyros kaki; LO:
Ligustrum obtusifolium; RP:
Robinia pseudoacacia.
