Inter- and intraspecific variation in stomatal pore area index along elevational gradients and its relation to leaf functional traits
Inter- and intraspecific variation in stomatal pore area index along elevational gradients and its relation to leaf functional traits
复制标题
DOI：
10.1007/s11258-016-0564-2
复制
发表时间：
2016-03-01
期刊：
影响因子：
1.7
通讯作者：
Roemermann, Christine
中科院分区：
文献类型：
--
作者：
Bucher, Solveig Franziska;Auerswald, Karl;Roemermann, Christine
气孔是气体交换的介质，因此对于光合作用和植物性能是重要的。本研究的目的是分析气孔面积指数（SPI）的生态解释能力，通过气孔大小和密度计算。我们研究了22个研究点的22个草本植物种的阳叶上的SPI分布在沿着两个海拔梯度在北方阿尔卑斯山范围从700至1800米a.s.l.。我们分析了它与其他功能性状相关的植物性能，即比叶面积（SLA），面积为基础的叶氮和碳（N-面积和C-面积，分别）以及碳歧视三角洲C-13内以及物种之间的相关性。在四个物种的一个子集，我们还测量了光饱和净光合速率在环境CO2浓度（ASAT）和气孔导度的所有网站。我们发现SPI与Asat呈正相关，但这种关系比预期的要弱。SPI的反应沿着海拔梯度是高度种特异性和相关的其他调查叶性状的变化。与功能性状的关系，但是，不同的种间和种内水平的强度和方向。大多数物种的SPI与N-面积和C-面积呈正相关，与SLA和Δ C-13呈负相关。然而，我们没有发现显着的关系，考虑到种平均值三角洲C-13和N-面积。SPI与SLA的关系最为一致，种间和种内关系无差异。这项研究表明，不同的过程可能作用于不同的
Stomata are mediators of gas exchange and thus important for photosynthesis and plant performance. The aim of this study was to analyze the ecological explanatory power of the stomatal pore area index (SPI) calculated via stomatal size and density. We studied the SPI on sun leaves of 22 herbaceous species on 22 study sites being distributed along two elevational gradients in the northern Alps ranging from 700 to 1800 m a.s.l.. We analyzed its correlation with other functional traits related to plant performance namely specific leaf area (SLA), area-based leaf nitrogen and carbon (N-area and C-area, respectively) as well as carbon discrimination Delta C-13 within as well as between species. On a subset of four species we also measured light-saturated net photosynthetic rate at ambient CO2 concentration (Asat) and stomatal conductance on all sites. We found that SPI was positively correlated with Asat, yet the relation was weaker than expected. The reaction of SPI along the elevational gradients was highly species-specific and related to variations in other investigated leaf traits. The relationship with functional traits, however, differed between the inter-and intraspecific level in strength and direction. SPI was positively related to N-area and C-area and negatively with SLA and Delta C-13 for most species. However, we found no significant relation considering species mean values for Delta C-13 and N-area. The relation of SPI to SLA was the most consistent displaying no difference when comparing the relation between and within species. This research shows that different processes may act on different