Tree size and site environment affects sessile oak growth and intrinsic water-use efficiency response to wet-dry years

作者：Kathiravan Meeran, Michael Grabner, Katharina Schott, Elisabeth Wächter, Marcela van Loo, Andrea Watzinger · 发表于：Forest Ecology and Management · 年份：2024 · DOI：10.1016/j.foreco.2024.122413 · 被引用次数：6 · 研究领域：Plant Water Relations and Carbon Dynamics、Forest ecology and management、Tree-ring climate responses

Drought is a significant global environmental stressor that impacts tree growth and survival, often causing substantial die-offs in temperate forests. Hence, contemporary forest management strategies increasingly aim to transition from spruce-dominated to mixed forest with more climate-resilient species such as oaks. Sessile oak ( Quercus petraea (Matt.) Liebl.), a key forest tree species, is widespread across central Europe, but its response to climate extremes, especially individual intraspecific variability, remains poorly understood. In this study, we analysed tree-ring cores from 404 sessile oak trees in Thayatal National park, Austria. We assessed radial growth through tree-ring width and evaluated intrinsic water-use efficiency (iWUE) by analyzing δ 13 C in latewood from wet (1987) and dry (1994) years. Further, we investigated the effects of site conditions, specifically light and water status inferred from potential daylight duration and the topographic wetness index (TWI), on key tree characteristics such as diameter at breast height (DBH), height, and the height-to-diameter ratio (HDR). We then examined how these factors affected iWUE and radial growth under wet and dry years, assessing radial growth's resistance, resilience, and recovery. As expected, iWUE was increased and radial growth was decreased during the dry year compared to the wet year, but there was high intraspecific variability. Tree age and size influenced these responses; age positively affected gro...