Variations of leaf and stem traits in relation to altitudinal distributions of 12 Fagaceae species of Mount Kinabalu, Borneo
Variations of leaf and stem traits in relation to altitudinal distributions of 12 Fagaceae species of Mount Kinabalu, Borneo
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DOI：
10.3759/tropics.ms19-14
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发表时间：
2020-01-01
期刊：
影响因子：
0.7
通讯作者：
Okada, Naoki
中科院分区：
文献类型：
--
作者：
Kawai, Kiyosada;Ahmad, Berhaman;Okada, Naoki
壳斗科植物在东南亚的分布具有多样性，但其机制尚不清楚。由于物种特征(形态和生理特征)可以决定它们的资源利用策略(例如，资源获取和分配的方式)，它们可能会影响它们在海拔上的分布。为了检验物种性状与海拔高度的关系，我们量化了生长在婆罗洲基纳巴卢山的12种壳斗科植物的10个叶和茎的性状及其相关性状与物种的最低、最高限度和海拔范围的变异。单位面积叶干质量(LMA)和叶片厚度高的物种垂直分布的上限较高，而与下限无关的性状。LMA、叶片厚度、叶片碳浓度和含氮量与物种的海拔高度呈正相关。这些结果表明，资源利用保守的物种具有更高的海拔极限和更宽的海拔范围，突出了叶片特征在密切相关物种之间海拔分布多样性中的作用。我们进一步认为，叶片特征的多样性可能导致热带山地森林中壳斗科物种的共存。
Fagaceae in Southeast Asia shows diverse distributions along altitude, but the underlying mechanisms remain unclear. Since species traits (morphological and physiological characteristics) can dictate their resource use strategies (e.g., the way of resource acquisition and allocation), they potentially influence their distributions along altitude. Here, to examine the linkage between species' traits and altitude, we quantified the variation of 10 leaf and stem traits of 12 Fagaceae species growing in Mount Kinabalu, Borneo and related traits to species' lowest and highest limits and altitudinal range. Species with high leaf dry mass per area (LMA) and lamina thickness showed higher upper limits of altitudinal distribution whereas no traits were correlated with the lower limits. LMA, lamina thickness, leaf carbon concentration, and nitrogen content positively covaried with species' altitudinal range. These results demonstrate that species with conservative resource use had higher altitudinal limits and wider altitudinal range, highlighting the role of leaf traits in the diversification of altitudinal distributions among closely-related species. We further suggest that diversifications in leaf traits potentially lead to the coexistence of Fagaceae species in tropical montane forests.