Fig. 6

NSC concentration represents the sum of soluble sugar and starch concentrations measured in three compartments (leaf, stem, root) of Amorpha fruticosa (a, c, e) and Robinia pseudoacacia (b, d, f) under different defoliation treatments through time. The values shown are mean ± SE (n = 4). Different letters indicate significant differences among different defoliation treatments (p < 0.05) with Duncan’s test. Lowercase letters without bold are used for soluble sugar concentration. Lowercase letters with bold are used for starch concentration. Uppercase letters are used for NSC concentration. CK, no defoliation; TD, defoliation of the top down 50% of the crown; BU, defoliation of the bottom up 50% of the crown