Knowledge Management System of Kunming Institute of Botany,CAS
| Physiological response and photosynthetic recovery to an extreme drought: Evidence from plants in a dry-hot valley savanna of Southwest China | |
| Yang,Da; Wang,Yang-Si-Ding; Wang,Qin; Ke,Yan; Zhang,Yun-Bing; Zhang,Shi-Bao; Zhang,Yong-Jiang; McDowell,Nate G.; Zhang,Jiao-Lin | |
| 2023 | |
| Source Publication | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| ISSN | 1879-1026 |
| Volume | 868Pages:161711 |
| Abstract | The frequency of extreme drought events has been rising worldwide, but due to its unpredictability, how plants will respond remains poorly understood. Here, we aimed to characterize how the hydraulics and photosynthesis of savanna plants respond to extreme drought, and tested whether they can subsequently recover photosynthesis after drought. There was an extreme drought in 2019 in Southwest (SW) China. We investigated photosynthetic gas exchange, leaf-, stem-, and whole-shoot hydraulic conductance of 18 plant species with diverse leaf habits (deciduous, semideciduous and evergreen) and growth forms (tree and shrub) from a dry-hot valley savanna in SW China for three rainy seasons from 2019 to 2021. We also compared photosynthetic gas exchange to those of a regular year (2014). We found that leaf stomatal and hydraulic conductance and maximum photosynthetic rate were significantly lower during the drought in 2019 than in the wetter years. In 2019, all studied plants maintained stomatal conductance at their minimum level observed, which could be related to high vapor pressure deficits (VPD, >2 kPa). However, no significant difference in stem and shoot hydraulic conductance was detected across years. The reductions in leaf hydraulic conductance and stomatal regulation under extreme drought might help keep the stem hydraulic function. Stomatal conductance and photosynthesis after drought (2020 and 2021) showed comparable or even higher values compared to that of 2014, suggesting high recovery of photosynthetic gas exchange. In addition, the response of hydraulic and photosynthetic traits to extreme drought was convergent across leaf habits and growth forms. Our results will help better understand the physiological mechanism underlying the response of savanna ecosystems to climate change. |
| Keyword | Extreme drought Gas exchange Hydraulic conductance Photosynthesis Physiological response Valley savannas LEAF HYDRAULIC CONDUCTANCE WATER-USE EFFICIENCY STOMATAL CLOSURE TROPICAL SAVANNA CLIMATE-CHANGE SEGMENTATION MECHANISMS STEM VULNERABILITY PRODUCTIVITY |
| Subject Area | Environmental Sciences & Ecology |
| DOI | 10.1016/j.scitotenv.2023.161711 |
| Indexed By | SCI |
| WOS ID | WOS:000925549200001 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.kib.ac.cn/handle/151853/75407 |
| Collection | 中国科学院昆明植物研究所 |
| Recommended Citation GB/T 7714 | Yang,Da,Wang,Yang-Si-Ding,Wang,Qin,et al. Physiological response and photosynthetic recovery to an extreme drought: Evidence from plants in a dry-hot valley savanna of Southwest China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2023,868:161711. |
| APA | Yang,Da.,Wang,Yang-Si-Ding.,Wang,Qin.,Ke,Yan.,Zhang,Yun-Bing.,...&Zhang,Jiao-Lin.(2023).Physiological response and photosynthetic recovery to an extreme drought: Evidence from plants in a dry-hot valley savanna of Southwest China.SCIENCE OF THE TOTAL ENVIRONMENT,868,161711. |
| MLA | Yang,Da,et al."Physiological response and photosynthetic recovery to an extreme drought: Evidence from plants in a dry-hot valley savanna of Southwest China".SCIENCE OF THE TOTAL ENVIRONMENT 868(2023):161711. |
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| 1-s2.0-S004896972300（3590KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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