Xylem plasticity allows rapid hydraulic adjustment to annual climatic variability
Xylem plasticity allows rapid hydraulic adjustment to annual climatic variability
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DOI：
10.1007/s00468-012-0802-8
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发表时间：
2013-06-01
影响因子：
2.3
通讯作者：
Fonti, Patrick
中科院分区：
文献类型：
--
作者：
Bryukhanova, Marina;Fonti, Patrick
由于适应，树木克服了环境的变化，并持续了几个世纪。导水细胞的解剖结构是决定植物成功的重要因素。形成细胞与环境相结合，它们的特性自然地保存在木材中。因此，它在树木年轮上的变化可以提供植物水力调节的回顾。本研究通过测量树木年轮管胞沿着的管腔和壁厚，探讨树木在不同植物水分条件下如何调节其导管系统。在低海拔地区对5株落叶落叶松和欧洲云杉的51个年轮管胞进行了沿着测定。解剖为基础的年表的年度增长业绩，水力传导和安全，建设成本。分析了年表之间的相似性以及与月气候数据的关系。大多数参数表现出较高的年度可塑性，这是部分连贯的树木之间，主要与径向生长。一般而言，夏季干旱减少了生长和潜在的水力传导的形成环，并增加了水力安全和建设成本。为了评估每年驯化的功能相关性，需要评估形成环相对于整个边材的导电性。
Thanks to acclimation, trees overcome environmental changes and endure for centuries. The anatomy of water conducting cells is an important factor determining plant success. Forming cells are coupled with the environment and their properties are naturally archived in the wood. Its variability across tree rings can thus provide a retrospective of plant's hydraulic adjustments. In this work, we measured lumen and wall thickness of tracheids along tree-rings to explore how trees regulate their conducting system under variable plant-water conditions. Tracheids were measured along 51 dated rings of five mature Larix decidua and Picea abies trees from a low elevation site. Anatomical-based chronologies of annual growth performance, hydraulic conductance and safety, and construction costs were built. Similarities among chronologies and the relation to monthly climate data were analyzed. Most parameters displayed high annual plasticity which was partly coherent among trees and mostly associated with radial growth. In general, summer drought reduced growth and potential hydraulic conductivity of the forming ring, and increased hydraulic safety and construction costs. To evaluate the functional relevance of the annual acclimation, the conductivity of the forming ring relative to the entire sapwood needs to be assessed.