Limited water availability did not protect poplar saplings from water use efficiency reduction under elevated ozone
文献类型：期刊论文
| 作者 | Xu, Yansen ; Feng, Zhaozhong; Shang, Bo; Yuan, Xiangyang; Tarvainen, Lasse
|
| 刊名 | FOREST ECOLOGY AND MANAGEMENT
 |
| 出版日期 | 2020-04-15 |
| 卷号 | 462页码:1-12 |
| 关键词 | Ozone Limited water availability Water use efficiency Photosynthesis Stomatal conductance Mesophyll conductance Populus deltoides |
| ISSN号 | 0378-1127 |
| 英文摘要 | Elevated ground-level ozone (O-3) concentrations decrease photosynthetic biochemistry more than stomatal conductance (g(s)), leading to an overall reduction in leaf-scale water use efficiency (WUE). Global warming is expected to lead to more severe and frequent droughts resulting in stomatal closure, increased WUE, and potentially in reduced plant O-3 uptake and damage. It is currently unclear how the physiological responses to O-3 and water limitation interact to affect overall leaf WUE and how these WUE responses might affect ecosystem productivity. In this study, we used open top chambers to expose O-3-sensitive poplar saplings to elevated O-3 (E-O-3) and limited water availability to explore the individual and interactive effects of these stressors on WUE. We found that leaf-scale intrinsic water-use efficiency based on gas exchange measurements (iWUE(ge)) decreased under E-O-3 due to significantly reduced photosynthetic capacity, mesophyll conductance and apparent quantum yield, while g(s) was not affected by the treatment. Leaf-scale iWUE(ge) and intrinsic WUE based on isotope measurements (iWUE(iso)) increased in the plants receiving less water due to higher photosynthetic capacities and lower transpiration rates indicated by delta O-18 measurements. The overall plant growth (total number of leaves, height, stem diameter and projected area of individual leaf) was significantly reduced under low water supply. Elevated O-3 resulted in significant leaf senescence, but had no other significant main effect on morphological variables. Reduced water availability prevented O-3 -induced decreases in leaf mass per area and increases in leaf loss. No other significant O-3-water availability interactions were detected in the measured physiological or morphological variables. Our results thus suggest that drought conditions will not prevent O-3 damage to photosynthetic biochemistry in poplar and that high O-3 concentrations will decrease leaf-scale iWUE(ge) regardless of future changes in plant water availability. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/44367]  |
| 专题 | 生态环境研究中心_城市与区域生态国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Xu, Yansen,Feng, Zhaozhong,Shang, Bo,et al. Limited water availability did not protect poplar saplings from water use efficiency reduction under elevated ozone[J]. FOREST ECOLOGY AND MANAGEMENT,2020,462:1-12. |
| APA | Xu, Yansen,Feng, Zhaozhong,Shang, Bo,Yuan, Xiangyang,&Tarvainen, Lasse.(2020).Limited water availability did not protect poplar saplings from water use efficiency reduction under elevated ozone.FOREST ECOLOGY AND MANAGEMENT,462,1-12. |
| MLA | Xu, Yansen,et al."Limited water availability did not protect poplar saplings from water use efficiency reduction under elevated ozone".FOREST ECOLOGY AND MANAGEMENT 462(2020):1-12. |
入库方式： OAI收割
来源：生态环境研究中心
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。