Fig. 2

Leaf nitrogen content of Q. gilva (Qg), H. hamabo (Hh), P. ramosissimus (Pr) C. virosa (Cv), B. latissimum (Bl), V. raddeana (Vr), and I. dichotoma (Id) grown under the control and treatment in 2009 (a) and 2011(b). Asterisk signs on the bars indicate significant differences between control and treatment within each species (Fisher’s least significant difference, P < 0.05)