Li Ronghua, Zhu Shidan, Chen Han Y H, John Robert, Zhou Guoyi, Zhang Deqiang, Zhang Qianmei, Ye Qing
Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, 723 Xingke Road, Tianhe District, Guangzhou, 510650, China.
Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, 723 Xingke Road, Tianhe District, Guangzhou, 510650, China.
Ecol Lett. 2015 Nov;18(11):1181-1189. doi: 10.1111/ele.12497. Epub 2015 Aug 27.
Significant changes in the composition of tree species have been observed in various forests worldwide. We hypothesised that these changes might result from variable sensitivities of species to global change, and species sensitivities might be quantified, using functional traits. Employing long-term (1978-2010) species abundance data of 48 tree species from a permanent subtropical forest plot, where multiple global change factors have been observed, including soil drying, we examined the relationships between temporal trends in abundance and suits of functional traits. We found that species with high photosynthesis rates, leaf phosphorus and nitrogen concentrations, specific leaf area, hydraulic conductivity, turgor loss point and predawn leaf water potential had increased in abundance, while species with opposite trait patterns had decreased. Our results demonstrate that functional traits underlie tree species abundance dynamics in response to drought stress, thus linking traits to compositional shifts in this subtropical forest under global changes.
全球各地的各类森林中都观察到了树种组成的显著变化。我们推测，这些变化可能是由于物种对全球变化的敏感性不同所致，并且可以利用功能性状来量化物种的敏感性。我们利用一个永久性亚热带森林样地中48种树木的长期（1978 - 2010年）物种丰度数据，该样地观测到了包括土壤干燥在内的多种全球变化因素，研究了丰度的时间趋势与一系列功能性状之间的关系。我们发现，具有高光合速率、叶片磷和氮浓度、比叶面积、水力传导率、膨压损失点和黎明前叶水势的物种丰度增加，而具有相反性状模式的物种丰度下降。我们的结果表明，功能性状是树木物种丰度动态对干旱胁迫响应的基础，从而将性状与全球变化下这片亚热带森林的组成变化联系起来。
