The Mexican tropical montane cloud forest trees occur under special and limited climatic conditions; many of these species are particularly more sensitive to drought stress. Hydric transport in leaf veins and wood features are influenced by climatic variations and individual intrinsic factors, which are essential processes influencing xylogenesis. We assessed the plastic response to climatic oscillation in two relict-endangered Magnolia schiedeana Schltdl. populations and associated the architecture of leaf vein traits with microenvironmental factors and wood anatomy features with climatic variables. The microenvironmental factors differed significantly between the two Magnolia populations and significantly influenced variation in M. schiedeana leaf venation traits. The independent chronologies developed for the two study forests were dated back 171–190 years. The climate-growth analysis showed that M. schiedeana growth is strongly related to summer conditions and growth responses to T_max, T_min, and precipitation. Our study highlights the use of dendroecological tools to detect drought effects. This association also describes modifications in vessel traits recorded before, during, and after drought events. In conclusion, our results advance our understanding of the leaf vein traits and wood anatomy plasticity in response to microenvironmental fluctuations and climate in the tropical montane cloud forest.

中文翻译：

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濒临灭绝的墨西哥云杉林木兰对气候事件的塑性响应：来自叶片通风和木质血管解剖的证据

墨西哥热带山地云雾林树木发生在特殊和有限的气候条件下。这些物种中的许多对干旱胁迫特别敏感。叶脉和木材特征中的水合运输受到气候变化和个体内在因素的影响，这是影响木糖生成的重要过程。我们评估了两个濒临灭绝的木兰schiedeana Schltdl对气候振荡的塑性响应。叶脉特征的结构及其与微环境因素的关联以及木材解剖特征与气候变量的关联。两种木兰种群之间的微环境因素差异显着，并极大地影响了分枝杆菌的变异。叶脉性状。为这两个研究林开发的独立年代学可以追溯到171-190年。气候增长分析表明，sch.deie的生长与夏季条件以及对T _max，T _min和降水的生长响应密切相关。我们的研究强调了使用树状生态学工具检测干旱影响。该关联还描述了干旱事件发生之前，之中和之后记录的容器性状的改变。总之，我们的结果使我们对热带山地云雾森林中微环境波动和气候响应下的叶脉特征和木材解剖学可塑性有了更深入的了解。