Amplified photosynthetic responses to drought events offset the positive effects of warming on arid desert plants.

Autor: Lin Y; Shapotou Desert Research and Experiment Station, Northwest Institute of Eco-environment and Resource Research, Chinese Academy of Sciences, Lanzhou, China; University of Chinese Academy of Sciences, Beijing, China., Xie T; Shapotou Desert Research and Experiment Station, Northwest Institute of Eco-environment and Resource Research, Chinese Academy of Sciences, Lanzhou, China; University of Chinese Academy of Sciences, Beijing, China., Li S; Shapotou Desert Research and Experiment Station, Northwest Institute of Eco-environment and Resource Research, Chinese Academy of Sciences, Lanzhou, China; University of Chinese Academy of Sciences, Beijing, China., Li X; Shapotou Desert Research and Experiment Station, Northwest Institute of Eco-environment and Resource Research, Chinese Academy of Sciences, Lanzhou, China; University of Chinese Academy of Sciences, Beijing, China. Electronic address: lxinrong@lzb.ac.cn., Liu W; Shapotou Desert Research and Experiment Station, Northwest Institute of Eco-environment and Resource Research, Chinese Academy of Sciences, Lanzhou, China; University of Chinese Academy of Sciences, Beijing, China.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2024 Nov 20; Vol. 952, pp. 175899. Date of Electronic Publication: 2024 Aug 31.
DOI: 10.1016/j.scitotenv.2024.175899
Abstrakt: Ongoing warming will influence plant photosynthesis via thermal effects and by enhancing water deficit. As the primary limiting factor for the growth and development of plants in arid deserts, water may alter the potential warming effects on plant photosynthesis and lead to increased uncertainty in plant dynamics. Here, we used open-top chambers (OTCs) to evaluate the impacts of in situ warming (+0.5 and +1.5 °C) on the photosynthesis and growth of two representative desert plants, Artemisia ordosica and Grubovia dasyphylla, from wet to dry spells. The plant traits associated with photosynthetic diffusive and biochemical processes were also measured to explore the underlying mechanisms involved. We found that warming significantly increased the net photosynthetic rate (A net ) during wet spells under 1.5 °C warming in both plants, while only increased that of A. ordosica under 0.5 °C warming. During dry spells, A net decreased both in A. ordosica and G. dasyphylla, with the rates of declining being 48 % and 41 %, respectively, higher than control under warming. Consequently, warming significantly amplified photosynthetic responses to drought events, which offset the positive warming effects during wet spells and led to unchanged plant biomass in both species. Besides, alterations in plant traits tended to be associated with positive warming effects during wet spells, and the negative effects of drought were mainly due to stomatal limitation. Our results emphasised that the potential benefits of warming during wet spells may be reversed during drought events. Thus, the adverse effects of ongoing warming on desert productivity may increase during dry spells in growing seasons and during dry years.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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