气候变化领域集成服务门户(CCPortal): Hydraulic properties and drought response of a tropical bamboo ( Cephalostachyum pergracile )

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DOI	10.1016/j.pld.2023.12.003
	Hydraulic properties and drought response of a tropical bamboo ( Cephalostachyum pergracile )
	Kongjarat, Wanwalee; Han, Lu; Aritsara, Amy Ny Aina; Zhang, Shu-Bin; Zhao, Gao -Juan; Zhang, Yong-Jiang; Maenpuen, Phisamai; Li, Ying-Mei; Zou, Yi-Ke; Li, Ming -Yi; Li, Xue-Nan; Tao, Lian-Bin; Chen, Ya-Jun
发表日期	2024
ISSN	2096-2703
EISSN	2468-2659
起始页码	46
结束页码	3
卷号	46 期号:3
英文摘要	Bamboo plants are an essential component of tropical ecosystems, yet their vulnerability to climate extremes, such as drought, is poorly understood due to limited knowledge of their hydraulic properties. Cephalostachyum pergracile , a commonly used tropical bamboo species, exhibited a substantially higher mortality rate than other co-occurring bamboos during a severe drought event in 2019, but the underlying mechanisms remain unclear. This study investigated the leaf and stem hydraulic traits related to drought responses, including leaf-stem embolism resistance (P 50leaf ; P 50stem ) estimated using optical and X-ray microtomography methods, leaf pressure -volume and water-releasing curves. Additionally, we investigated the seasonal water potentials, native embolism level (PLC) and xylem water source using stable isotope. We found that C . pergracile exhibited strong resistance to embolism, showing low P 50leaf , P 50stem , and turgor loss point, despite its rapid leaf water loss. Interestingly, its leaves displayed greater resistance to embolism than its stem, suggesting a lack of effective hydraulic vulnerability segmentation (HVS) to protect the stem from excessive xylem tension. During the dry season, approximately 49% of the water was absorbed from the upper 20 -cm -deep soil layer. Consequently, signi ficant diurnal variation in leaf water potentials and an increase in midday PLC from 5.87 +/- 2.33% in the wet season to 12.87 +/- 4.09% in the dry season were observed. In summary, this study demonstrated that the rapid leaf water loss, high reliance on surface water, and a lack of effective HVS in C . pergracile accelerated water depletion and increased xylem embolism even in the typical dry season, which may explain its high mortality rate during extreme drought events in 2019. Copyright (c) 2023 Kunming Institute of Botany, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BYNC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
英文关键词	Climate change; Drought; Hydraulic safety; Hydraulic vulnerability segmentation; Stable isotope; Tree mortality
语种	英语
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
WOS记录号	WOS:001235376900001
来源期刊	PLANT DIVERSITY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/304137
作者单位	Chinese Academy of Sciences; Xishuangbanna Tropical Botanical Garden, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences; Xishuangbanna Tropical Botanical Garden, CAS; University of Maine System; University of Maine Orono; University of Maine System; University of Maine Orono; Pu'er University; Yunnan University; Southwest Forestry University - China; Chinese Academy of Sciences; Xishuangbanna Tropical Botanical Garden, CAS
推荐引用方式 GB/T 7714	Kongjarat, Wanwalee,Han, Lu,Aritsara, Amy Ny Aina,et al. Hydraulic properties and drought response of a tropical bamboo ( Cephalostachyum pergracile )[J],2024,46(3).
APA	Kongjarat, Wanwalee.,Han, Lu.,Aritsara, Amy Ny Aina.,Zhang, Shu-Bin.,Zhao, Gao -Juan.,...&Chen, Ya-Jun.(2024).Hydraulic properties and drought response of a tropical bamboo ( Cephalostachyum pergracile ).PLANT DIVERSITY,46(3).
MLA	Kongjarat, Wanwalee,et al."Hydraulic properties and drought response of a tropical bamboo ( Cephalostachyum pergracile )".PLANT DIVERSITY 46.3(2024).