The Distribution and Composition of Epiphytic Bryophytes in a Mature and a Naturally Regenerated Cypress Forest at the Chi-Lan Mountain Site
| Autor: | Yen-Ling Chu, 朱妍綾 |
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| Rok vydání: | 2008 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 96 The epiphytic bryophytes in two Chamaecyparis obtusa var. formosana forests of different ages were studied at the Chi-Lan Mountain (CLM) site in northeastern Taiwan. The C. obtusa var. formosana of the mature forest was about 400 years old, while the naturally regenerated forest had an age of about 40. The bryophytic composition, coverage, and biomass on the stems at different heights and aspects and on the branches were investigated on 3 trees of the mature forest using the single rope technique. The bryophyte data of the young forest were taken from Deng (2005). The number of species, coverage and biomass of epiphytic bryophytes in the mature forest were higher than those in the naturally regenerated forest. In the mature forest, 49 bryophyte species were found and Bazzania was the dominant genus, while in the naturally regenerated forest, only 24 bryophytes species were found and Bazzania was also the dominant genus. The highest coverage and biomass of bryophytes were found near the base of trunks in both forests. The coverage and biomass of epiphytic bryophytes on trunks in the mature forest showed a fluctuating vertical distribution pattern. On the contrary, the bryophytic coverage and biomass on trunks of the young forest were found to decrease with increasing height. In the mature forest, the higher coverage and biomass of bryophytes were found on the trunk surface facing toward the northwest, and the lower were found in southeastern aspect. Compared to the mature forest, the distribution of bryophytes in the young forest was homogeneous in all aspects, which, might result from the more closed canopy in the young forest. Bazzania, Leucobryum, Frullania, Anastrophyllum, Herbertus, Jungermannia and Pleurozia grew on higher positions above ground in the mature forest than in the naturally regenerated forest. The difference in species number, the distribution of coverage and biomass of bryophytes between the two forests might be attributed to the size of phorophytes, different patterns of vertical gradients of light and moisture, and the colonization history of bryophytes. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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