Linking leaf veins to growth and mortality rates: an example from a subtropical tree community.
Linking leaf veins to growth and mortality rates: an example from a subtropical tree community.
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将叶静脉与生长率联系起来：亚热带树群落的一个例子。
DOI：
10.1002/ece3.2311
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发表时间：
2016-09
影响因子：
2.6
通讯作者：
Swenson, Nathan G.
中科院分区：
文献类型：
--
作者：
Iida, Yoshiko;Sun, I-Fang;Price, Charles A.;Chen, Chien-Teh;Chen, Zueng-Sang;Chiang, Jyh-Min;Huang, Chun-Lin;Swenson, Nathan G.
关键词：
生态学的一个基本目标是将物种功能的变化与性能联系起来，但功能特征-性能调查取得了不同程度的成功。这表明不常测量的功能特征可能更清楚地阐明特质-绩效关系。尽管叶脉性状与资源输送率和光合能力有关，具有潜在的重要性，但很少有研究研究这些性状与社区人口统计学表现之间的关系。本文研究了亚热带森林中54种共发生物种的叶脉特征与种群率（相对生长率、RGR和死亡率）之间的关系，以及这些特征在土壤环境中的空间分布。使用分层贝叶斯方法估计人口统计率的规模相关变化。接下来，量化肯德尔等级相关性在性状和估计人口比率在给定的规模和性状和物种-平均土壤环境之间。脉系较密、微孔较小、多肉质较少或叶片较薄的物种在各种大小类别中表现出较高的RGR。叶片叶脉较密、面积较大、构造成本较低或木材较薄或密度低的物种仅在小尺寸类中与高死亡率相关。最后，与我们的预期相反，获取性状与资源丰富的土壤条件无关。本研究表明，叶脉性状与其他树种性状的相关性虽弱，但显著。由于与获取策略相关的叶片性状（如脉系较密、多肉质较少、叶片较薄）具有较高的生长率，而相似的叶片性状与死亡率无关，因此不同的途径可能影响物种的生长和生存。这项研究表明，我们仍然没有测量与资源利用策略相关的一些关键特征，这些特征决定了物种的人口统计和分布。
A fundamental goal in ecology is to link variation in species function to performance, but functional trait–performance investigations have had mixed success. This indicates that less commonly measured functional traits may more clearly elucidate trait–performance relationships. Despite the potential importance of leaf vein traits, which are expected to be related to resource delivery rates and photosynthetic capacity, there are few studies, which examine associations between these traits and demographic performance in communities. Here, we examined the associations between species traits including leaf venation traits and demographic rates (Relative Growth Rate, RGR and mortality) as well as the spatial distributions of traits along soil environment for 54 co‐occurring species in a subtropical forest. Size‐related changes in demographic rates were estimated using a hierarchical Bayesian approach. Next, Kendall's rank correlations were quantified between traits and estimated demographic rates at a given size and between traits and species‐average soil environment. Species with denser venation, smaller areoles, less succulent, or thinner leaves showed higher RGR for a wide range of size classes. Species with leaves of denser veins, larger area, cheaper construction costs or thinner, or low‐density wood were associated with high mortality rates only in small size classes. Lastly, contrary to our expectations, acquisitive traits were not related to resource‐rich edaphic conditions. This study shows that leaf vein traits are weakly, but significantly related to tree demographic performance together with other species traits. Because leaf traits associated with an acquisitive strategy such as denser venation, less succulence, and thinner leaves showed higher growth rate, but similar leaf traits were not associated with mortality, different pathways may shape species growth and survival. This study suggests that we are still not measuring some of key traits related to resource‐use strategies, which dictate the demography and distributions of species.
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