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The intraspecific variation of functional traits modulates drought resilience of European beech and pubescent oak
Journal of Ecology ( IF 5.3 ) Pub Date : 2021-07-09 , DOI: 10.1111/1365-2745.13743 Ester González de Andrés 1 , Teresa Rosas 2, 3 , Jesús Julio Camarero 1 , Jordi Martínez‐Vilalta 2, 3
中文翻译：
功能性状的种内变异调节欧洲山毛榉和短柔毛橡树的抗旱能力
更新日期：2021-07-09
Journal of Ecology ( IF 5.3 ) Pub Date : 2021-07-09 , DOI: 10.1111/1365-2745.13743 Ester González de Andrés 1 , Teresa Rosas 2, 3 , Jesús Julio Camarero 1 , Jordi Martínez‐Vilalta 2, 3
Affiliation
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- A higher frequency and intensity of droughts will impair forest productivity. Therefore, improving our understanding of which factors enhance tree growth resilience against drought has become a crucial issue, but we lack information at the intraspecific level.
- In this study, we investigate the role played by climatic conditions and tree characteristics in the growth response to severe droughts in two deciduous Fagaceae species near their southern distribution limit: the temperate European beech Fagus sylvatica and the Mediterranean pubescent oak Quercus pubescens. The study area is located in Catalonia, NE Spain, where 149 trees were cored covering the water availability gradient of the species in the region. In addition, tree size (diameter and height) and an ensemble of stem, leaf and hydraulic traits were collected for each tree. Growth responses to extreme droughts during the period 1980–2015 were assessed using resilience indicators based on residual basal area increment series predicted by a model including growing season water balance.
- Although resistance was unrelated to drought intensity, higher water availability improved recovery and reduced drought legacy effects. Taller trees showed higher resilience against drought, which could be explained by the relationship between the variation in tree height and functional traits, such as leaf nitrogen concentration, leaf turgor loss point and resistance to xylem embolism. For both species, trees with lower cavitation resistance, higher leaf nitrogen concentration and tighter stomatal regulation (suggested by less negative turgor loss point and carbon isotope composition) displayed better performance during and after severe droughts. Both species showed a progressive decrease in resilience and increase in legacy effects.
- Synthesis. This study highlights the relevance of analysing intraspecific variation of functional traits involved in tree water and carbon balance to improve our understanding of the resilience and variability of growth responses to drought within species.
中文翻译：
功能性状的种内变异调节欧洲山毛榉和短柔毛橡树的抗旱能力
- 更高频率和强度的干旱将损害森林生产力。因此，提高我们对哪些因素增强树木抗旱能力的理解已成为一个关键问题，但我们缺乏种内水平的信息。
- 在这项研究中，我们调查了气候条件和树木特征在靠近南部分布界限的两种落叶山毛榉科植物对严重干旱的生长响应中所起的作用：温带欧洲山毛榉Fagus sylvatica和地中海短柔毛橡木Quercus pubescens. 研究区位于西班牙东北部的加泰罗尼亚，其中 149 棵树被取芯，覆盖了该地区物种的可用水梯度。此外，还收集了每棵树的树木大小（直径和高度）以及茎、叶和水力性状的集合。1980-2015 年期间对极端干旱的生长响应是使用恢复力指标评估的，该指标基于由包括生长季节水平衡在内的模型预测的剩余基础面积增量系列。
- 尽管抗性与干旱强度无关，但更高的可用水量改善了恢复并减少了干旱遗留影响。较高的树木表现出更高的抗旱能力，这可以通过树木高度的变化与功能性状之间的关系来解释，例如叶氮浓度、叶膨大损失点和对木质部栓塞的抵抗力。对于这两个物种，具有较低空化抗性、较高叶氮浓度和更严格气孔调节（由较少的负膨胀损失点和碳同位素组成表明）的树木在严重干旱期间和之后表现出更好的表现。这两个物种都表现出复原力的逐渐下降和遗留效应的增加。
- 合成。这项研究强调了分析与树木水和碳平衡相关的功能性状的种内变异的相关性，以提高我们对物种内对干旱的生长反应的恢复力和可变性的理解。
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