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首页> 外文期刊>The New Phytologist >Hydraulics and life history of tropical dry forest tree species: coordination of species' drought and shade tolerance
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Hydraulics and life history of tropical dry forest tree species: coordination of species' drought and shade tolerance

机译：热带旱林树种的水力学和生活史：树种的干旱和耐荫性的协调

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Plant hydraulic architecture has been studied extensively, yet we know little about how hydraulic properties relate to species' life history strategies, such as drought and shade tolerance. The prevailing theories seem contradictory.We measured the sapwood (K-s) and leaf (K-l) hydraulic conductivities of 40 coexisting tree species in a Bolivian dry forest, and examined associations with functional stem and leaf traits and indices of species' drought (dry-season leaf water potential) and shade (juvenile crown exposure) tolerance.Hydraulic properties varied across species and between life-history groups (pioneers vs shade-tolerant, and deciduous vs evergreen species). In addition to the expected negative correlation of K-l with drought tolerance, we found a strong, negative correlation between K-l and species' shade tolerance. Across species, K-s and K-l were negatively correlated with wood density and positively with maximum vessel length. Consequently, drought and shade tolerance scaled similarly with hydraulic properties, wood density and leaf dry matter content. We found that deciduous species also had traits conferring efficient water transport relative to evergreen species.Hydraulic properties varied across species, corresponding to the classical trade-off between hydraulic efficiency and safety, which for these dry forest trees resulted in coordinated drought and shade tolerance across species rather than the frequently hypothesized trade-off.
机译：植物的水力结构已被广泛研究，但我们对水力特性如何与物种的生活史策略（如干旱和耐荫性）相关的了解甚少。流行的理论似乎是矛盾的。我们测量了玻利维亚干旱森林中40种同时存在的树种的边材（Ks）和叶（Kl）的水力传导率，并研究了与功能性茎和叶性状的关联以及物种干旱指数（干旱季节）叶片的水势）和遮荫（幼年树冠暴露）的耐受性。不同物种之间以及生活史群体之间的水力学特性各不相同（先驱者与耐荫性之间的关系，以及落叶与常绿树种之间的关系）。除了预期的K-1与干旱耐受性负相关外，我们还发现K-1与物种的阴影耐受性之间存在强的负相关性。跨物种，K-s和K-1与木材密度呈负相关，与最大血管长度呈正相关。因此，干旱和阴影耐受性与水硬性，木材密度和叶片干物质含量相似。我们发现，相对于常绿树种，落叶树种还具有赋予水有效运输的特性。不同树种的水力特性各不相同，这与水力效率和安全性之间的经典折衷相对应，这对于这些干燥的林木而言，导致协调的干旱和耐荫性物种，而不是经常假设的权衡。

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