摘要
维管植物的水分传输过程一直是植物学家关注的重点,木质部是植物体内长距离运输的组织之一,为维管植物提供了一个将水分从根运输到叶的低阻力通道。木质部在结构上形成了一个相互连通的网络管道结构,外部环境要素的改变(水分胁迫、氮沉降、光照等)引起的植物体内水势及木质部网络管道结构的变化直接影响植物的水分传输过程。本文从植物水分传输驱动力和内部木质部微观结构出发,总结了水分传输机理过程,概述了影响木质部水分传输的直接和间接因素,并在全球变化背景下,在植物内部观测技术、考虑多因子的综合作用等研究方面进行了展望。
The mechanism of water transport in vascular plants is one of the most important topics in plant research.As a long-distance-transport tissue in vascular plants,xylem provides a low resistance pathway for water movement from root to leaf.Since the xylem is a structural network of interconnected conduits,altered network structure of xylem following the changes in abiotic factors（e.g.water stress,nitrogen deposition,light,etc.） directly affects the dynamics of water transport in plants.Based on the review of driving force and microstructure for xylem water transport,up-to-date understanding of the mechanism of xylem water transport was briefly summarized in this paper,and the direct and indirect impacts of abiotic factors on the xylem water transport were also discussed.Finally,a promising observation technique for xylem network structure was introduced and further studies on the interaction of various factors in xylem water transport were suggested.
出处
《生态学杂志》
CAS
CSCD
北大核心
2017年第11期3281-3288,共8页
Chinese Journal of Ecology
基金
国家自然科学基金项目(31670707
31400541
41675112)
国家重点基础研究发展计划(2013CB429902-2)
中国科学院重点部署项目(KFZD-SW-305)资助
关键词
水力导度
木质部管道结构
水分胁迫
氮沉降
hydraulic conductivity
xylem structure
water stress
nitrogen deposition
