| 要旨トップ | 本企画の概要 | 日本生態学会第66回全国大会 (2019年3月、神戸) 講演要旨
ESJ66 Abstract


シンポジウム S18-6  (Presentation in Symposium)

Temperature acclimation in leaf respiration may mitigate response of canopy respiration to climate warming in a hinoki cypress stand

*Masatake Araki(FFPRI), Koichiro Gyokusen(Kyushu Univ.), Takuya Kajimoto(FFPRI)

Plant respiration (R) is a key determinant of the carbon cycle in forest ecosystems. In general, it has been anticipated that plant R will increase in response to climate warming since R is highly dependent on temperature (T) and the T response of plant R is assumed to be static. However, recent studies have demonstrated that the R-T response is seasonally dynamic and, thus, plant R can acclimate to ambient air T. The present study examined vertical and seasonal variations in the short-term T response of leaf R in a young hinoki cypress canopy, Kumamoto, Japan. We found that leaf R in hinoki cypress is able to adjust to seasonal changes in ambient temperature, and that the variations in leaf R can be predicted by relatively simple parameters, namely light and temperature (Araki et al. 2017). Based on these results, we developed a model that included seasonally variable R-T response to estimate total canopy R. Responses of canopy R to temperature increase according to the RCP scenarios were predicted and compared with another prediction by a model with static R-T response. Consequently, incorporating temperature acclimation of leaf R into the simulation model considerably reduced predictions of increase in CO2 release from hinoki cypress canopy in response to climate warming.


日本生態学会