Knowledge Management System Of Institute Of Botany,CAS
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 |
ISSN | 2095-6355 |
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 |
DOI | 10.1186/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 |
EISSN | 2197-5620 |
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 | |
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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