Warming Responses of Leaf Morphology Are Highly Variable among Tropical Tree Species
Warming Responses of Leaf Morphology Are Highly Variable among Tropical Tree Species
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DOI：
10.3390/f13020219
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发表时间：
2022-02-01
期刊：
影响因子：
2.9
通讯作者：
Wallin, Goran
中科院分区：
文献类型：
--
作者：
Manishimwe, Aloysie;Ntirugulirwa, Bonaventure;Wallin, Goran
叶形态特征随气候梯度沿着变化，但目前还不清楚这在多大程度上是驯化而不是适应的结果。了解这一点对于预测树木等长寿生物在快速变化的气候中的功能非常重要。研究了沿着海拔梯度从2400 m起的三个地点种植的18种具有早期（ES）和晚期（LS）演替策略的热带树种的叶片形态变暖响应。(15.2平均温度）至1300 m a.s.l. (20.6在卢旺达，平均气温为摄氏度。叶面积（LA）和单位面积叶质量（LMA）的大小表示下降，而叶宽/长比（W/L）的增加与变暖，但只有三分之一至一半的物种。而LA下降ES种，但大多不是在LS种，LMA和叶W/L的变化是共同的两个演替组。ES种具有较低的LMA和较高的LA和叶W/L相比，LS种。在这项研究中的幼年树的LMA和LA的值大多类似于相应的数据在卢旺达的另一个海拔梯度研究中的四个成熟树种，表明我们的研究结果也适用于成熟的森林树木。我们的结论是，叶形态变暖的反应有很大的不同演替群体和个别物种，在温暖的气候中的物种竞争力和社区组成的潜在后果。
Leaf morphological traits vary along climate gradients, but it is currently unclear to what extent this results from acclimation rather than adaptation. Knowing so is important for predicting the functioning of long-lived organisms, such as trees, in a rapidly changing climate. We investigated the leaf morphological warming responses of 18 tropical tree species with early (ES) abd late (LS) successional strategies, planted at three sites along an elevation gradient from 2400 m a.s.l. (15.2 degrees C mean temperature) to 1300 m a.s.l. (20.6 degrees C mean temperature) in Rwanda. Leaf size expressed as leaf area (LA) and leaf mass per area (LMA) decreased, while leaf width-to-length ratio (W/L) increased with warming, but only for one third to half of the species. While LA decreased in ES species, but mostly not in LS species, changes in LMA and leaf W/L were common in both successional groups. ES species had lower LMA and higher LA and leaf W/L compared to LS species. Values of LMA and LA of juvenile trees in this study were mostly similar to corresponding data on four mature tree species in another elevation-gradient study in Rwanda, indicating that our results are applicable also to mature forest trees. We conclude that leaf morphological responses to warming differ greatly between both successional groups and individual species, with potential consequences for species competitiveness and community composition in a warmer climate.