Hydraulic properties and drought response of a tropical bamboo(Cephalostachyum pergracile)

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外文摘要：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 under-lying mechanisms remain unclear.This study investigated the leaf and stem hydraulic traits related to drought responses,including leaf-stem embolism resistance(P50leaf;P50stem)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 P50leaf,P50stem,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,significant 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.

外文关键词：

Climate changeDroughtHydraulic safetyHydraulic vulnerability segmentationStable isotopeTree mortality

作者：

Wanwalee Kongjarat、Lu Han、Amy Ny Aina Aritsara、Shu-Bin Zhang、Gao-Juan Zhao、Yong-Jiang Zhang、Phisamai Maenpuen、Ying-Mei Li、Yi-Ke Zou、Ming-Yi Li、Xue-Nan Li、Lian-Bin Tao、Ya-Jun Chen

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作者单位：

CAS Key Laboratory of Tropical Forest Ecology,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Yunnan 666303,China

University of the Chinese Academy of Sciences,Beijing 100049,China

T-STAR Core Team,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Yunnan 666303,China

School of Biology and Ecology,University of Maine,Orono,ME,USA

Climate Change Institute,University of Maine,Orono,ME 04469,USA

School of Biological and Chemical Science,Pu'er University,Xueyuan Road,Yunnan 665000,China

Institute of Ecology and Geobotany,School of Ecology and Environmental Sciences,Yunnan University,Kunming,Yunnan 650091,China

School of Ecology and Environment,Southwest Forestry University,Kunming,Yunnan 650224,China

Yuanjiang Savanna Ecosystem Research Station,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Yuanjiang,Yunnan 653300,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaCAS'Light of West China'Program14th Five-Year Plan of the Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences14th Five-Year Plan of the Xishuangbanna Tropical Botanical Garden,Chinese Academy of SciencesYunnan Provincial Science and Technology DepartmentYunnan Revitalization Talents Support Plan

项目编号：

3207173532371576323504104204186114401631570406E3ZKFF1KE3ZKFF2B2018HB068YNWR-QNBJ-2019177

出版年：

2024

DOI：

10.1016/j.pld.2023.12.003

植物多样性(英文)

中国科学院昆明植物研究所，中国植物学会

植物多样性(英文)

CSTPCD

影响因子：0.617

ISSN：2096-2703

年,卷(期)：2024.46(3)