Author:
Kim Gwang-Jung,Jo Heejae,Cho Min Seok,Noh Nam Jin,Han Seung Hyun,Khamzina Asia,Kim Hyung-Sub,Son Yowhan
Abstract
AbstractThe frequency and intensity of summer extreme climate events are increasing over time, and have a substantial negative effect on plants, which may be evident in their impact on photosynthesis. Here, we examined the photosynthetic responses of Larix kaempferi and Pinus densiflora seedlings to extreme heat (+ 3 °C and + 6 °C), drought, and heavy rainfall by conducting an open-field multifactor experiment. Leaf gas exchange in L. kaempferi showed a decreasing trend under increasing temperature, showing a reduction in the stomatal conductance, transpiration rate, and net photosynthetic rate by 135.2%, 102.3%, and 24.8%, respectively, in the + 6 °C treatment compared to those in the control. In contrast, P. densiflora exhibited a peak function in the stomatal conductance and transpiration rate under + 3 °C treatment. Furthermore, both species exhibited increased total chlorophyll contents under extreme heat conditions. However, extreme precipitation had no marked effect on photosynthetic activities, given the overall favorable water availability for plants. These results indicate that while extreme heat generally reduces photosynthesis by triggering stomatal closure under high vapor pressure deficit, plants employ diverse stomatal strategies in response to increasing temperature, which vary among species. Our findings contribute to the understanding of mechanisms underlying the photosynthetic responses of conifer seedlings to summer extreme climate events.
Funder
MAFRA | Korea Forest Service
Ministry of Education
Publisher
Springer Science and Business Media LLC
Reference64 articles.
1. Alexander, L. V. et al. Global observed changes in daily climate extremes of temperature and precipitation. J Geophys Res Atmospheres 1984 2012 111, D05109 (2006).
2. Jentsch, A., Kreyling, J. & Beierkuhnlein, C. A new generation of climate-change experiments: Events, not trends. Front. Ecol. Environ. 5, 365–374 (2007).
3. Shenoy, S., Gorinevsky, D., Trenberth, K. E. & Chu, S. Trends of extreme US weather events in the changing climate. Proc National Acad Sci 119, e2207536119 (2022).
4. Espinosa, L. A., Portela, M. M., Matos, J. P. & Gharbia, S. Climate change trends in a European coastal metropolitan area: Rainfall, temperature, and extreme events (1864–2021). Atmosphere 13, 1995 (2022).
5. World Meteorology Organization State of the climate in Asia 2021. (2022).