Abstract: In this study, we used the method of submerged culture to detect the health status, chlorophyll contents and photosynthetic fluorescence parameters of epiphytic moss Homaliodendron montagneanum (C. Muell.) Fleisch under the pollution stress of Pb²⁺, Zn²⁺ and their combination. The results showed that chlorophyll contents decreased significantly when the moss were cultured under Pb²⁺, Zn²⁺ and combination of both, respectively, and the effect of Pb²⁺ stress was greater than that of Zn²⁺ stress. Pb²⁺, Zn²⁺ stress and Pb²⁺Zn²⁺ combination stress caused obvious decreases in maximal photochemical efficiency of PSII (F_v/F_m), effective photochemical efficiency of PSII (F_v′/F_m′), effective quantum yield of PSII (Ф_PSⅡ), coefficient of photochemical quenching (q_P) and acyclic electron transfer rate (ETR). However, coefficients of nonphotochemical quenching (NPQ) increased initially and then decreased under low concentration stress while NPQ was continuously decreased under high concentration stress. Furthermore, the chlorophyll contents and the photosynthetic fluorescence parameters of H. montagneanum responded differently under the treatments of Pb²⁺, Zn²⁺ and their combination. The variations of chlorophyll contents and photosynthetic fluorescence parameters indicated that the influence of Pb²⁺ stress on H. montagneanum was greater than that of Zn²⁺ or Pd²⁺Zn²⁺ combination under the same concentrations.

Key words: soil salinization, Amorpha fruticosa, sap flow, environmental factor