In the Taisetsu Mountains of Hokkaido, Dwarf bamboo has increased the distribution area in alpine meadow probably due to recent acceleration of snowmelt time, and it may cause a declination of alpine vegetation and biodiversity. However, there are very few studies on the responses of dwarf bamboo to climate change, and little is known about physiological responses along the elevation gradient. The purpose of this study is to figure out the expansion mechanism of dwarf bamboo to alpine region under changing climate in terms of photosynthetic activity, growth and productivity.
The maximum photosynthetic rates were the highest in the montane site, decreased with elevation. Similarly, leaf area index decreased with elevation. Culm density was about 20(m^-2)in the montane site, while it was about 60(m^-2)in the alpine site. Culm height was 180cm in the monatane site, while it was 90cm in the alpine site. Therefore, resource allocation for elogation of individual culms was predominant in the low altitude in which competition for light capture is severe. In contrast, an increase in culm density by frequent branching was acclerated in the alpine area by which the number of leaves was enhanced, resulting in high productivity under the conditions of high irradiance.
In this seminar, I will show bamboo's morphological traits and photosynthetic traits along an elevation gradient. And I'd like to show directions of future analysis.