Alternative height strategies among 45 dicot rain forest species from tropical Queensland, Australia
Alternative height strategies among 45 dicot rain forest species from tropical Queensland, Australia
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DOI：
10.1111/j.0022-0477.2005.00992.x
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发表时间：
2005-06-01
影响因子：
5.5
通讯作者：
Westoby, M
中科院分区：
文献类型：
--
作者：
Falster, DS;Westoby, M
1潜在高度，跨越物种至少一个数量级，被认为是光捕获策略的重要指标。尽管如此，仍不清楚潜在高度如何与影响高度生长速率，茎持久性和弱光下表现的其他性状协调。我们提出，对于选择的跨越成熟森林内的光可用性和自干扰以来的时间的两个假设轴的物种集，可以观察到潜在高度和其他植物属性之间的对比相关性。我们选择了澳大利亚潮湿热带地区的45种多年生雨林物种，以跨越光可用性和演替状态的梯度，并测量了潜在高度以及影响光捕获的性状，成熟个体的更新策略。这些性状包括单位面积叶质量、叶氮、木材密度、单位长度茎质量、分支质量分数和种子质量。3潜在高度与跨越两个梯度的物种之间的许多性状显著相关。在光照和演替梯度沿着，株高与叶质量面积（-1）、叶氮和种子质量呈显著正相关，与叶面积比呈显著负相关。树高与木材密度沿着演替轴呈显著正相关，沿光梯度呈相反的关系沿着。4性状关系在两个梯度之间的斜率或截距不同，反映了不同的战略权衡。在给定的高度，演替梯度中的矮种的特点是叶质量面积较低（-1），较轻的木材，较小的种子，较低的叶氮和较低的叶面积比在分支顶端比类似大小的物种沿着光梯度。5这项研究的结果支持两个不同的，性状介导的轴之间的共存植物中的矮和高的植物物种的想法。在一些情况下，性状关系是弱或不显着的物种分组合并时，这表明分离出两套比较研究的重要性。
1 Potential height, which spans at least an order of magnitude across species, is considered an important indicator of light capture strategy. Still, it remains unclear how potential height is coordinated with other traits that influence height growth rate, stem persistence and performance in low light. We proposed that contrasting correlations between potential height and other plant attributes would be observed for sets of species selected to span two hypothetical axes of light availability within mature forest and time since disturbance.2 We selected 45 perennial rain forest species in Australia's wet tropics to span gradients of light availability and successional status and measured potential height together with traits influencing light capture and regeneration strategy on mature individuals. The traits included leaf mass per area, leaf nitrogen, wood density, stem mass per length, branch mass fraction and seed mass.3 Potential height was significantly correlated with numerous traits among species selected to span each of the two gradients. Height was positively correlated with leaf mass area(-1), leaf nitrogen and seed mass and negatively correlated with leaf area ratio at the branch tip along both light and successional gradients. Height was positively correlated with wood density along the successional axis, with the opposite relationship along the light gradient.4 Trait relationships differed in either slope or intercept between the two gradients, reflecting different strategic trade-offs. At a given height, shorter species in the successional gradient were characterized by lower leaf mass area(-1), lighter wood, smaller seeds, lower leaf nitrogen and lower leaf area ratio at the branch tip than similar sized species along the light gradient.5 The results of this study support the idea of two distinct, trait-mediated axes of coexistence among short and tall plant species within vegetation. In several cases, trait relationships were weak or non-significant when species groupings were merged, indicating the importance of separating out the two sets for comparative studies.