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Thermal safety margins of plant leaves across biomes under a heatwave
Kitudom, Nawatbhrist4; Fauset, Sophie3; Zhou, Yingying4; Fan, Zexin1,2; Li, Murong5; He, Mingjian5; Zhang, Shubin; Xu, Kun6; Lin, Hua1
2022
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
Volume806Issue:xPages:-
AbstractClimate change has great impacts on forest ecosystems, especially with the increasing frequency of heatwaves. Thermal safety margin (TSM) calculated by the difference between body temperature and thermotolerance threshold is useful to predict thermal safety of organisms. It has been widely used for animals, whereas has rarely been reported for plants. Besides, most of the previous studies used only thermotolerance to estimate thermal safety or used thermotolerance and air temperature (Ta) to calculate TSM. However, leaf temperature (Tl) is the real "body" temperature of plant leaves. Tl decoupling from Ta might induce large error in TSM. Here, we investigated TSM of photosystem II (thermotolerance of PSII - the maximum Tl) of dominant canopy plants in four forests from tropical to temperate biomes during a heatwave, and compared the TSMs calculated by Tl (TSM.Tl) and Ta (TSM.Ta) respectively. Also, thermal related leaf traits were investigated. The results showed that both TSM. Tl and TSM.Ta decreased from the cool forests to the hot forests. TSM.Tl was highly correlated with the maximum leaf temperature (Tlmax), while had an opposite trend with thermotolerance across biomes. Thus, Tlmax instead of thermotolerance can be used to evaluate TSM. The maximum Ta (Tamax), Tlmax and leaf traits explained 68% of the variance of thermotolerance in a random forest model, where Tamax and Tlmax explained 62%. TSM.Ta could not distinguish thermal safety differences between co-occurring species. The overestimation of TSM by TSM.Ta increased from the tropical to the temperate forest, and increased with Tl within biome. Therefore, it is not recommended to use TSM.Ta in cold forests. The present study enriches the dataset of photosynthetic TSMs across biomes, proposes using Tlmax to estimate TSMs of leaves, and highlights the risk of hot dry forest during heatwaves. (c) 2021 Elsevier B.V. All rights reserved.
KeywordPhotosynthetic heat tolerance Thermal environment Heat stress Thermal stability Extreme weather
Subject AreaEnvironmental Sciences & Ecology
DOI10.1016/j.scitotenv.2021.150416
Indexed BySCI
Language英语
WOS IDWOS:000707640400017
Citation statistics
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/12364
Collection2012年后新成立研究组
Affiliation1.Chinese Acad Sci, Xishuangbanna Trop Bot Garden, Key Lab Trop Forest Ecol, Mengla 666303, Yunnan, Peoples R China
2.Chinese Acad Sci, Ctr Plant Ecol, Core Bot Gardens, Xishuangbanna 666303, Peoples R China
3.Chinese Acad Sci, Xishuangbanna Trop Bot Garden, Ailaoshan Stn Subtrop Forest Ecosyst Studies, Jingdong 676209, Yunnan, Peoples R China
4.Univ Plymouth, Sch Geog Earth & Environm Sci, Plymouth, Devon, England
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
6.Puer Univ, Coll Biol & Chem, Puer 665000, Yunnan, Peoples R China
7.Chinese Acad Sci, Kunming Inst Bot, Yunnan Lijiang Forest Ecosyst Natl Observat & Res, Kunming 650201, Yunnan, Peoples R China
Recommended Citation
GB/T 7714
Kitudom, Nawatbhrist,Fauset, Sophie,Zhou, Yingying,et al. Thermal safety margins of plant leaves across biomes under a heatwave[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2022,806(x):-.
APA Kitudom, Nawatbhrist.,Fauset, Sophie.,Zhou, Yingying.,Fan, Zexin.,Li, Murong.,...&Lin, Hua.(2022).Thermal safety margins of plant leaves across biomes under a heatwave.SCIENCE OF THE TOTAL ENVIRONMENT,806(x),-.
MLA Kitudom, Nawatbhrist,et al."Thermal safety margins of plant leaves across biomes under a heatwave".SCIENCE OF THE TOTAL ENVIRONMENT 806.x(2022):-.
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