Do karst woody plants control xylem tension to avoid substantial xylem cavitation in the wet season?
文献类型：期刊论文
| 作者 | Fan, Dayong; Zhang, Shouren4; Yan, Hui1,4; Wu, Qian4; Xu, Xinwu3,4; Wang, Xiangping |
| 刊名 | FOREST ECOSYSTEMS
 |
| 出版日期 | 2018 |
| 卷号 | 5 |
| ISSN号 | 2095-6355 |
| 关键词 | Karst forest Leaf conductivity loss Leaf phenology Photochemistry efficiency of photosystem II |
| DOI | 10.1186/s40663-018-0158-7 |
| 文献子类 | Article |
| 英文摘要 | 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. |
| 学科主题 | Forestry |
| 电子版国际标准刊号 | 2197-5620 |
| 出版地 | LONDON |
| WOS关键词 | LEAF HYDRAULIC CONDUCTANCE ; STOMATAL CONDUCTANCE ; TROPICAL FOREST ; WATER-RELATIONS ; GAS-EXCHANGE ; TRADE-OFF ; VULNERABILITY ; TRAITS ; EVERGREEN ; EMBOLISM |
| 语种 | 英语 |
| 出版者 | SPRINGEROPEN |
| WOS记录号 | WOS:000454626400001 |
| 资助机构 | National Key Research and Development Program of China [2016YFA0600802] ; State Key Project of Research and Development Plan [2016YFC0502104] |
| 源URL | [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.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.China Meteorol Adm, Beijing 100081, Peoples R China 3.Inner Mongolia Forestry Monitoring & Planning Aca, Hohhot 010020, Peoples R China 4.Beijing Forestry Univ, Coll Forestry, Beijing 100083, 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). |
入库方式： OAI收割
来源：植物研究所
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