Specific leaf area correlates with temperature: new evidence of trait variation at the population, species and community levels
Specific leaf area correlates with temperature: new evidence of trait variation at the population, species and community levels
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DOI：
10.1007/s00035-015-0150-6
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发表时间：
2015-07
期刊：
影响因子：
2.7
通讯作者：
S. Rosbakh;C. Römermann;P. Poschlod
中科院分区：
文献类型：
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作者：
S. Rosbakh;C. Römermann;P. Poschlod
尽管人们提出用比叶面积 (SLA) 来反映植物对气候变化的反应，但 SLA 和温度之间的联系从未得到系统评估。利用巴伐利亚阿尔卑斯山沿温度梯度分布的 29 个钙质草原中 223 个物种的原位测量 SLA 值，我们探讨了种群（种内）、物种（种间）和群落水平上的 SLA 与温度关系，并研究了其他环境因素对群落水平上沿温度梯度的 SLA 变化的相对影响。尽管 SLA 值的种内变异性很大，但只有 14% 的研究物种的 SLA 值随温度梯度出现显着变化。在物种层面，我们发现 SLA 与温度之间存在非常弱的正相关关系 (r2= 0.04，p< 0.001)。在社区层面检测到 SLA 与温度之间存在非常强的正相关性 (r2= 0.70,p< 0.001)。除温度外，扰动对群落水平的性状变异也有显着影响。我们得出的结论是，SLA沿温度梯度的变化主要来自物种相对丰度的变化，而种群和物种水平的性状变化则受到其他环境因素的影响。因此，我们建议在采用 SLA-温度关系的研究中使用社区加权平均值，因为它们比站点内和站点间 SLA 值的基本分布揭示了更多的规则模式。
Although specific leaf area (SLA) has been proposed to reflect plant responses to climatic changes, the link between SLA and temperature has never been systematically evaluated. Using in situ measured SLA values for 223 species occurring in 29 calcareous grasslands along a temperature gradient in the Bavarian Alps, we explored the SLA–temperature relationship at population (intraspecific), species (interspecific) and community level and investigated the relative impact of other environmental factors on SLA variation along the temperature gradient at the community level. Only 14 % of the studied species showed significant changes in their SLA values along the temperature gradient, despite high intraspecific variability of the SLA values. At the species level, we revealed a very weak positive SLA–temperature relationship (r2= 0.04,p< 0.001). A very strong positive correlation between SLA and temperature was detected at the community level (r2= 0.70,p< 0.001). In addition to temperature, disturbance also had a significant influence on trait variation at the community level. We conclude that the variation in SLA along the temperature gradient comes primarily from changes in the relative abundances of species, whereas the trait variation at the population and the species levels was affected by other environmental factors. We therefore recommend the use of community-weighted mean values in studies employing SLA–temperature relationships because they reveal more regular patterns than the underlying distribution of within- and among-site SLA values.