Decoupled leaf and stem economics in rain forest trees
Decoupled leaf and stem economics in rain forest trees
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DOI：
10.1111/j.1461-0248.2010.01517.x
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发表时间：
2010-11-01
期刊：
影响因子：
8.8
通讯作者：
Chave, Jerome
中科院分区：
文献类型：
--
作者：
Baraloto, Christopher;Paine, C. E. Timothy;Chave, Jerome
P>；对植物功能特征的跨物种分析已经阐明了导致表现和分布差异的因素，但到目前为止，大多数研究都集中在叶或茎上。我们通过整合来自4672棵树代表668种新热带树木的13448片树叶和木材组织的功能特征数据，将这些特定于组织的功能策略分析扩展到全植物方法。以前被定义为叶片经济光谱的性状之间的强相关性反映了对快速周转的高产叶片的投资与具有长期收入来源的昂贵的实物叶片结构之间的权衡。第二个变异轴是“树干经济谱”，它在树干水平上定义了类似的权衡：致密的木材与高含水率的木材和厚皮。最重要的是，这两个轴是正交的，这表明在叶和茎水平上的权衡是独立进行的。通过将热带树木的多元生态策略简化为沿这两个光谱的位置，我们的结果为改进全球植被模型预测热带森林对全球变化的响应提供了基础。
P>Cross-species analyses of plant functional traits have shed light on factors contributing to differences in performance and distribution, but to date most studies have focused on either leaves or stems. We extend these tissue-specific analyses of functional strategy towards a whole-plant approach by integrating data on functional traits for 13 448 leaves and wood tissues from 4672 trees representing 668 species of Neotropical trees. Strong correlations amongst traits previously defined as the leaf economics spectrum reflect a tradeoff between investments in productive leaves with rapid turnover vs. costly physical leaf structure with a long revenue stream. A second axis of variation, the 'stem economics spectrum', defines a similar tradeoff at the stem level: dense wood vs. high wood water content and thick bark. Most importantly, these two axes are orthogonal, suggesting that tradeoffs operate independently at the leaf and at the stem levels. By simplifying the multivariate ecological strategies of tropical trees into positions along these two spectra, our results provide a basis to improve global vegetation models predicting responses of tropical forests to global change.