Bamboo climatic tolerances are decoupled from leaf functional traits across an Andean elevation gradient
Bamboo climatic tolerances are decoupled from leaf functional traits across an Andean elevation gradient
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DOI：
10.1111/oik.09229
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发表时间：
2022-08-16
期刊：
影响因子：
3.4
通讯作者：
Feeley, Kenneth J.
中科院分区：
文献类型：
--
作者：
Fadrique, Belen;Baraloto, Chris;Feeley, Kenneth J.
温度和降水模式的广泛变化给植物物种带来了新的和综合的压力，影响了它们的性能和分布。功能性状是植物资源利用-获取策略的指标，因此它们通常用于了解植物物种的地理分布和物种对气候变化的潜在响应。到目前为止，大多数研究都针对一些易于测量的叶性状，即使其他性状，如气候耐受性，可以提供有价值的信息，直接与物种的当前和未来的分布。在这里，我们测量了叶片功能性状和指标的生理耐热性（T-50）和耐旱性（细胞膜稳定性）在28个木本竹种群从22个窄范围的物种沿着一个> 3000米的海拔梯度在秘鲁南部安第斯山脉。我们发现，竹叶功能性状保持相当恒定的组合指示的收购策略（低叶质量面积和高氮单位质量）沿着海拔梯度，尽管环境的急剧变化和快速的物种更替。不同竹种的耐热性和耐旱性在沿着梯度上差异较大，且呈负相关。竹类种群的耐旱性与海拔高度和降水季节性呈正相关，而耐热性下降，在较高，较冷的海拔。当对每个物种内的个体或每个海拔高度内的个体进行分析时，气候耐受性的两个指标没有显示出一致的关系，与耐热性和耐旱性之间潜在权衡的预期形成对比。我们还发现，所测量的叶功能性状是不好的气候耐受性的预测。我们的研究结果说明了多样性和复杂性的功能策略和环境梯度之间的关系，并强调使用基本的（即“软”）叶性状来了解植物分布和气候耐受性的局限性。
Widespread changes in temperature and precipitation patterns present plant species with new and combined stresses that affect their performance and distribution. Functional traits are indicators of plant resource use-acquisition strategies and thus they are commonly used to understand the geographic distributions of plant species and species' potential responses to climate change. To date, most studies have targeted a few easy-to-measure leaf traits even though other traits, such as climatic tolerances, could provide valuable information directly related with species' current and future distributions. Here, we measured both leaf functional traits and indices of physiological tolerance to heat (T-50) and drought (cell membrane stability) in 28 woody bamboo populations from 22 narrow-ranged species along a > 3000 m elevation gradient in the southern Peruvian Andes. We found that bamboo leaf functional traits remain fairly constant with a combination indicative of an acquisitive strategy (low leaf mass area and high nitrogen per mass) along the elevation gradient, despite drastic changes in environment and fast species turnover. Heat and drought tolerances of bamboos varied widely along the gradient and were negatively correlated to each other. Drought tolerance of bamboo populations was positively related with elevation and with precipitation seasonality while heat tolerance decreased at higher, colder elevations. When analyzed for individuals within each species or for individuals within each elevation, the two metrics of climatic tolerances did not show a consistent relationship, contrasting with the expectation of a potential tradeoff between heat and drought tolerance. We also found that the measured leaf functional traits were not good predictors of climatic tolerances. Our results illustrate the diversity and complexity of the relationships between functional strategies and environmental gradients and highlight the limitations of using basic (i.e. 'soft') leaf traits to understand plant distributions and climatic tolerances.