Epiphytic bryophytes are structural components in tropical and sub-tropical forests. To understand variation of the biomass of bole bryophytes along the latitudinal and altitudinal gradients, the biomass of bole bryophytes in tropical forests (Mengla), sub-tropical forests (Zhenyuan) and sub-alpine forests (Lijiang) in Yunnan, SW China were carried out. The results showed: (1) Biomass of bole bryophytes were significantly different along the latitudinal and altitudinal gradients. The lowest (0.53 g?400 cm-2) and the highest (3.57 g?400 cm-2) biomass occurred in the tropical forest of Mengla and the subalpine coniferous forest of Lijiang, respectively. (2) There was no dominant species shared among the three forests. (3) The biomass proportion of dominant component declined along the altitude gradients, they were 92.3% (Mengla), 75.6% (Zhenyuan) and 85.2% (Lijiang) of the total biomass. (4) Smooth mat, fan and turf were the dominant life-forms in tropical forests, sub-tropical evergreen broadleaved forests and sub-alpine coniferous forests, respectively. The results would provide preliminary insights on the structure, function and dynamics in the mountain forest ecosystems.
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