Phenology along Yushan Peaks Trail from Tatachia to Yushan Main Peak in Yushan National Park
英文摘要
Yushan National Park is one of three representative alpine national parks in Taiwan. The flowering and fruiting phenologies were surveyed along the Yushan Main Peak Trail from Tatachia (alt. 2600 m) to the main peak of Mt. Jade (alt. 3952 m)from March, 2016 to September, 2017 for each month. A total 240 species were recorded, among them, 218 species were found flowering during the survey period. The numbers of flowering species increased with the temperature significantly, but not precipitation. Most of species bloomed in July to August, and the number of flowering species began decreasing in September. The most of fruiting species occurred in September, which was about one to two months later than the month which is the peak number of flowering species. With the elevation ascent, most of plants tended to bloom later than those of the same species distribute in lower altitudes. Compared with the flowering phenologies among different years in the same study area, the peak of flowering species was extended in 2013, 2016, 2017 and 2018 than 1987-1989. In addition, the abundances of flowering species were higher during the autumn in 2013, 2016, 2017 and 2018 than in 1987-1989. Global warming seems affected the flowering phenology of alpine ecosystem in Yushan National Park. We also conducted time-lapse monitoring photographs on Cirsium arisanense, C. tatakaensem, Potentilla leuconota, Primula miyabeana, Rhododendron pseudochrysanthum, and R. rubropilosum. And, the flowering accumulated temperature of R. pseudochrysanthum were calculated.