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Do karst woody plants control xylem tension to avoid substantial xylem cavitation in the wet season?
Fan, Dayong; Zhang, Shouren1; Yan, Hui1,2; Wu, Qian1; Xu, Xinwu1,3; Wang, Xiangping
2018
发表期刊FOREST ECOSYSTEMS
ISSN2095-6355
卷号5
摘要BackgroundPlants have been hypothesized to maintain strong control over xylem tension by closing stomata and to operate at a water potential above or near the critical potential at which cavitation commences. An alternative hypothesis holds that cavitation temporarily relieves water stress and stomatal closure is insufficient to prevent short term run-away cavitation.MethodsThe objectives of this study were to investigate the leaf conductivity loss at noon (Loss) of 13 woody species differing in leaf phenology at two sites on karst topography in the wet season in southwestern China; the hydraulic architecture of woody species has rarely been reported previously. Loss was predicted from minimum field leaf water potentials ((min)) and laboratory-generated vulnerability curves. We also measured the maximum quantum efficiency of photosystem II using chlorophyll a fluorescence (F-v/F-m) and other associated leaf traits.ResultsLoss in the field varied substantially, from 1.39% in evergreen Itea chinensis to 90.07% in deciduous Sapium sebiferum. However, the Loss did not significantly decrease the efficiency of photosystem II. The water potential at which a 50% loss in leaf conductivity occurred ((50)) was not correlated to (min). The co-occurring evergreen and deciduous species differed significantly in some stem hydraulic and associated leaf traits. Deciduous species had higher hydraulic conductance, photosynthetic rate, stomatal conductance, lower cavitation-resistance and minimum water potential than co-occurring evergreen species.ConclusionsThere was no sign that karst woody species in southwestern China could control xylem tension above the threshold to avoid substantial xylem cavitation in the wet season. There was no association between Loss and F-v/F-m among the studied species. This isohydric regulation behaviour, as well as abundant rainfall in the wet season, may explain why large variations of Loss existed across karst woody species in southwestern China.
关键词Karst forest Leaf conductivity loss Leaf phenology Photochemistry efficiency of photosystem II
学科领域Forestry
DOI10.1186/s40663-018-0158-7
收录类别SCI
语种英语
WOS关键词LEAF HYDRAULIC CONDUCTANCE ; STOMATAL CONDUCTANCE ; TROPICAL FOREST ; WATER-RELATIONS ; GAS-EXCHANGE ; TRADE-OFF ; VULNERABILITY ; TRAITS ; EVERGREEN ; EMBOLISM
WOS记录号WOS:000454626400001
出版者SPRINGEROPEN
文献子类Article
出版地LONDON
EISSN2197-5620
资助机构National Key Research and Development Program of China [2016YFA0600802] ; State Key Project of Research and Development Plan [2016YFC0502104]
作者邮箱dayong.fan@anu.edu.au ; zsr@ibcas.ac.cn
作品OA属性gold
引用统计
被引频次:6[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ibcas.ac.cn/handle/2S10CLM1/20356
专题植被与环境变化国家重点实验室
作者单位1.Beijing Forestry Univ, Coll Forestry, Beijing 100083, Peoples R China
2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
3.Inner Mongolia Forestry Monitoring & Planning Aca, Hohhot 010020, Peoples R China
4.China Meteorol Adm, Beijing 100081, Peoples R China
推荐引用方式
GB/T 7714
Fan, Dayong,Zhang, Shouren,Yan, Hui,et al. Do karst woody plants control xylem tension to avoid substantial xylem cavitation in the wet season?[J]. FOREST ECOSYSTEMS,2018,5.
APA Fan, Dayong,Zhang, Shouren,Yan, Hui,Wu, Qian,Xu, Xinwu,&Wang, Xiangping.(2018).Do karst woody plants control xylem tension to avoid substantial xylem cavitation in the wet season?.FOREST ECOSYSTEMS,5.
MLA Fan, Dayong,et al."Do karst woody plants control xylem tension to avoid substantial xylem cavitation in the wet season?".FOREST ECOSYSTEMS 5(2018).
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