Abstract We monitored seasonal dynamics of stem water status of four coniferous species (Abies alba, Larix decidua, Picea abies and Pinus sylvestris) planted at the Borová hora Arboretum (300 m a.s.l., Zvolen valley, Central Slovakia) beyond their ecological and production optima, in the region with warmer and drier climate compared to the sites of their origin. Species-specific stem water deficit and maximum daily shrinkage were extracted from diurnal band dendrometer records of stem circumference recorded by digital band dendrometers DRL26 installed on five trees per species, and correlations with environmental variables were analysed. The seasonal stem circumference increment of all tree species was higher in 2017 than in the drier and hotter year of 2018. The greatest seasonal stem circumference increment in the observed periods of 2017 and 2018 was observed for A. alba and P. sylvestris, respectively. The highest and lowest values of daily and seasonal stem water deficit were observed for L. decidua and A. alba, respectively. The analysis of trees' short-term response to extreme climate events seems to be the promising and suitable method for detecting tree species tolerance towards drought.

中文翻译：

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缺水条件下针叶树生长和树木水分状况的种间变化

摘要 我们监测了种植在 Borová hora 植物园（斯洛伐克中部 Zvolen 山谷 300 米）的四种针叶树种（冷杉、落叶松、云杉和樟子松）的茎水分状况的季节性动态，超出了它们的生态和生产最佳状态，与它们的原产地相比，该地区气候更温暖、更干燥。从安装在每个物种五棵树上的数字带状树状仪 DRL26 记录的茎周的昼夜带状树状仪记录中提取特定物种的茎水分亏缺和最大日收缩量，并分析与环境变量的相关性。2017年所有树种的季节性茎周增量均高于2018年较干热年份。分别在 2017 年和 2018 年观察到的 A. alba 和 P. sylvestris 观察到了最大的季节性茎周增量。分别在 L. decidua 和 A. alba 中观察到最高和最低的每日和季节性茎水分亏缺值。分析树木对极端气候事件的短期反应似乎是检测树种对干旱的耐受性的有前途和合适的方法。