Figure 3.

Activities of glutamine synthetase (GS) and glutamate dehydrogenase (GDH) in Pogonatum cirratum subsp. fuscatum and Hypnum plumaeforme exposed to the indicated amounts of N addition, with or without low temperature stress immediately (+LTS and −LTS respectively), or after a 10-day recovery period (R.+LTS and R.−LTS, respectively). Data are presented as means + S.D. (n = 3). Different letters on the bars indicate significant differences between samples exposed to various N concentrations under each temperature treatment (p < 0.05, one-way ANOVA, LSD test). ^* on the bars in the +LTS and R.+LTS groups indicate significant differences between corresponding +LTS and −LTS, and R.+LTS and R.−LTS data, respectively (p < 0.05, t-test).