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Drought-Induced Mortality Is Related to Hydraulic Vulnerability Segmentation of Tree Species in a Savanna Ecosystem
Zhang, Shubin1,2; Wen, Guojing2; Yang, Daxin2
2019
Source PublicationFORESTS
ISSN1999-4907
Volume10Issue:8Pages:-
AbstractVulnerability segmentation (VS) has been widely suggested to protect stems and trunks from hydraulic failure during drought events. In many ecosystems, some species have been shown to be non-segmented (NS species). However, it is unclear whether drought-induced mortality is related to VS. To understand this, we surveyed the mortality and recruitment rate and measured the hydraulic traits of leaves and stems as well as the photosynthesis of six tree species over five years (2012-2017) in a savanna ecosystem in Southwest China. Our results showed that the NS species exhibited a higher mortality rate than the co-occurring VS species. Across species, the mortality rate was not correlated with xylem tension at 50% loss of stem hydraulic conductivity (P-50stem), but was rather significantly correlated with leaf water potential at 50% loss of leaf hydraulic conductance (P-50leaf) and the difference in water potential at 50% loss of hydraulic conductance between the leaves and terminal stems (P50leaf-stem). The NS species had higher Huber values and maximum net photosynthetic rates based on leaf area, which compensated for a higher mortality rate and promoted rapid regeneration under the conditions of dry-wet cycles. To our knowledge, this study is the first to identify the difference in drought-induced mortality between NS species and VS species. Our results emphasize the importance of VS in maintaining hydraulic safety in VS species. Furthermore, the high mortality rate and fast regeneration in NS species may be another hydraulic strategy in regions where severe seasonal droughts are frequent.
Keyworddrought-induced mortality vulnerability segmentation seasonal drought hydraulic conductivity sapwood density
Subject AreaForestry
DOI10.3390/f10080697
Indexed BySCI
Language英语
WOS IDWOS:000482949200101
Citation statistics
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/11481
Collection支撑系统
Affiliation1.Chinese Acad Sci, Xishuangbanna Trop Bot Garden, CAS Key Lab Trop Forest Ecol, Mengla 666303, Yunnan, Peoples R China
2.Kyoto Univ, Grad Sch Agr, Kitashirakawa Oiwake Cho, Kyoto 6068502, Japan
3.Chinese Acad Sci, Xishuangbanna Trop Bot Garden, Yuanjiang Savanna Ecosyst Res Stn, Yuanjiang 653300, Yunnan, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Shubin,Wen, Guojing,Yang, Daxin. Drought-Induced Mortality Is Related to Hydraulic Vulnerability Segmentation of Tree Species in a Savanna Ecosystem[J]. FORESTS,2019,10(8):-.
APA Zhang, Shubin,Wen, Guojing,&Yang, Daxin.(2019).Drought-Induced Mortality Is Related to Hydraulic Vulnerability Segmentation of Tree Species in a Savanna Ecosystem.FORESTS,10(8),-.
MLA Zhang, Shubin,et al."Drought-Induced Mortality Is Related to Hydraulic Vulnerability Segmentation of Tree Species in a Savanna Ecosystem".FORESTS 10.8(2019):-.
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