Weak tradeoff between xylem safety and xylem-specific hydraulic efficiency across the world's woody plant species
文献类型：期刊论文
| 作者 | Fan, ZX (Fan, Ze-Xin)[ 17 ]
|
| 刊名 | NEW PHYTOLOGIST
 |
| 出版日期 | 2016 |
| 卷号 | 209期号:1页码:123-136 |
| 关键词 | cavitation embolism hydraulic conductivity mean annual precipitation mean annual temperature xylem |
| 中文摘要 | The evolution of lignified xylem allowed for the efficient transport of water under tension, but also exposed the vascular network to the risk of gas emboli and the spread of gas between xylem conduits, thus impeding sap transport to the leaves. A well-known hypothesis proposes that the safety of xylem (its ability to resist embolism formation and spread) should trade off against xylem efficiency (its capacity to transport water). We tested this safety-efficiency hypothesis in branch xylem across 335 angiosperm and 89 gymnosperm species. Safety was considered at three levels: the xylem water potentials where 12%, 50% and 88% of maximal conductivity are lost. Although correlations between safety and efficiency were weak (r(2) < 0.086), no species had high efficiency and high safety, supporting the idea for a safety-efficiency tradeoff. However, many species had low efficiency and low safety. Species with low efficiency and low safety were weakly associated (r(2) < 0.02 in most cases) with higher wood density, lower leaf-to sapwood-area and shorter stature. There appears to be no persuasive explanation for the considerable number of species with both low efficiency and low safety. These species represent a real challenge for understanding the evolution of xylem. |
| 公开日期 | 2016-01-25 |
| 源URL | [http://ir.xtbg.org.cn/handle/353005/9643]  |
| 专题 | 西双版纳热带植物园_2012年后新成立研究组 |
| 推荐引用方式 GB/T 7714 | Fan, ZX . Weak tradeoff between xylem safety and xylem-specific hydraulic efficiency across the world's woody plant species[J]. NEW PHYTOLOGIST,2016,209(1):123-136. |
| APA | Fan, ZX .(2016).Weak tradeoff between xylem safety and xylem-specific hydraulic efficiency across the world's woody plant species.NEW PHYTOLOGIST,209(1),123-136. |
| MLA | Fan, ZX ."Weak tradeoff between xylem safety and xylem-specific hydraulic efficiency across the world's woody plant species".NEW PHYTOLOGIST 209.1(2016):123-136. |
入库方式： OAI收割
来源：西双版纳热带植物园
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。