A006-0002
Difference of isoprene emission along slope positions in an abandoned Moso bamboo (Phyllostachys pubescens) forest

Monday, 7 December 2020
Poster
Ting-Wei Chang1, Tomonori Kume2, Ayumi Katayama2, Motonori Okumura3, Linjie Jiao1, Siyu Chen1 and Yoshiko Kosugi1, (1)Kyoto University, Graduate School of Agriculture, Kyoto, Japan, (2)Shiiba Research Forest of Kyushu University, Miyazaki, Japan, (3)Research Institute of Environment, Agriculture and Fisheries, Osaka, Japan
Abstract:
Isoprene can induce air pollution and enhancing greenhouse indirectly. It has been reported that Moso bamboo (Phyllostachys pubescens), a highly isoprene emitter species, expands and invades into the adjacent ecosystem in the forest ecosystem of hill or mountainous area in Japan. To assess the isoprene emission from Moso bamboo in the areas, there is a need to clarify the influence in the isoprene emission trait among the slope position along a hillslope. Therefore, this study aimed to: (1) clarify whether differences in isoprene emission trait of Moso bamboos among different positions on a hillslope; (2) find the potential reason that causing the difference in the isoprene emission trait. The field measurement was conducted in a management-abandoned Moso bamboo forest located in Fukuoka, Japan, with the slope angle of 42.8 degrees. Two plots were set on elevation at 180 m and 255 m, respectively. Lower bamboo culms were chosen as subjects due to the difficulty to access into the canopy. As the result, even within a very short horizontal distance (less than 80 m), the plot at upper position showed significantly higher isoprene emission fluxes (16.39±7.63 nmol m-2 s-1) than those of the lower plot (9.84±4.54 nmol m-2 s-1) (P < 0.01) under the same light intensity and similar temperature. The most possible factor causing the difference is the area-based nitrogen concentration in the leaf, which showed a positive correlation to isoprene flux (R = 0.71). The two plot indeed showed different area-based nitrogen concentration (upper plot: 1.051±0.123 g m-2; lower plot: 0.950±0.045 g m-2) (P < 0.01), which is consistent with the tendency of soil nitrogen concentration of the two plot (upper plot: 0.38±0.05 %; lower plot: 0.27±0.02 %). The result indicates that isoprene emission flux from Moso bamboo at different slope position can be different and the reason can be attributed to the nitrogen concentration in leaves.
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