Influence of Edaphic Salinity on Leaf Morphoanatomical Functional Traits on Juvenile and Adult Trees of Red Mangrove (Rhizophora mangle): Implications with Relation to Climate Change
Influence of Edaphic Salinity on Leaf Morphoanatomical Functional Traits on Juvenile and Adult Trees of Red Mangrove (Rhizophora mangle): Implications with Relation to Climate Change
复制标题
土壤盐度对红树林幼树和成年树叶片形态解剖功能特征的影响：与气候变化相关的影响
DOI：
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发表时间：
2021
期刊：
影响因子：
2.9
通讯作者：
Jairo Humberto Medina Calderón
中科院分区：
文献类型：
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作者：
A. Sánchez;J. E. M. Pineda;Xavier Marquínez Casas;Jairo Humberto Medina Calderón
根茎红树（Rhizophora mangle L.）是分布最广的新热带红树种之一。该物种表现出巨大的物候变异性，这与它生长的沉积物的盐浓度有关。受间隙水和潮汐水盐度浓度影响最大的器官是叶片。由于高盐度导致缺水，它改变了植物的光合和水力过程。为了解两个生长阶段叶片参数变化与盐度水分胁迫之间的关系，在3个结构不同、自然盐度范围不同的红树林（寡盐：5.8 ~ 11.7实用盐度单位（PSU））中，定量分析了mangle R. mangle幼树和成树叶片的形态解剖功能性状；Euhaline: 9.2-35.6 PSU和23.9-47.7 PSU)。我们假设由盐度引起的水分胁迫会导致电导率、水储存和光合组织的改变。我们的研究结果表明，与成鱼相比，幼鱼受盐度影响的形态解剖性状数量更多，与水分积累和运输相关的性状变异更大。受到较高盐度的成鱼和幼鱼对这一因素的变化具有更强的容忍度，从而比源自低盐环境的个体更能适应高水分亏缺的环境。mangle种群之间对盐度适应性的差异可能意味着对气候变化的不同响应，其中低盐源种群将更容易受到这一现象导致的高盐化，而真盐源种群可以更有效地忍受水生压力，从而延长其持久性并随着时间的推移提供生态系统服务。
Rhizophora mangle L. is one of the most distributed species of neotropical mangroves. The species exhibits great phenological variability that is associated with saline concentrations of the sediment where it grows. Among the organs that are most affected by interstitial and tidal water salinity concentrations are the leaves. Since the hypersalinity generates water deficiency, it changes photosynthetic and hydraulic processes of the plant. To understand the relationship between the variation in leaf blade parameters and the water stress generated by salinity in two growth stages, morphoanatomical functional traits were quantified in leaves of juveniles and adults of R. mangle in three structurally different mangrove forests with different ranges of natural salinity (Oligohaline: 5.8–11.7 practical salinity units (PSU); Euhaline: 9.2–35.6 PSU and 23.9–47.7 PSU). We hypothesized that water stress caused by salinity generates modification in conductivity, water-storage, and photosynthetic tissues. Our results showed a greater number of morphoanatomical traits affected by salinity in juveniles compared to adults, greater variability in the traits associated with water accumulation and transport. Adults and juveniles subjected to higher values of salinity had traits more tolerant of variability in this factor, allowing superior adaptation to environments with high water deficit than individuals originating in oligohaline environments. This difference in adaptability to salinity between populations of R. mangle may imply different responses to climate change, where populations of oligohaline origin will be more susceptible to hypersalinization resulting from this phenomenon, while populations of euhaline origin could more effectively tolerate the aquatic stresses caused, allowing a prolongation of their permanence and the provision of their ecosystem services over time.