Physiological response and photosynthetic recovery to an extreme drought: Evidence from plants in a dry-hot valley savanna of Southwest China

doi:10.1016/j.scitotenv.2023.161711

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	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
发表期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	1879-1026
卷号	868 页码:161711
摘要	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.
关键词	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
学科领域	Environmental Sciences & Ecology
DOI	10.1016/j.scitotenv.2023.161711
收录类别	SCI
WOS记录号	WOS:000925549200001
引用统计	被引频次：16[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/75407
专题	中国科学院昆明植物研究所
推荐引用方式 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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