Abstract In the Australian semi-arid–arid zone, hydrological records are typically only 40–60 years long, prohibiting an understanding of long-term hydrological variability. Kati-Thanda – Lake Eyre Basin (KT-LEB), is the fifth largest terminal lake in the world, experiences highly variable flows and supports myriad flora and fauna. The opportunistic and highly irregular growth of trees in KT-LEB means that tree-ring records have not been developed in the region. E. coolabah is a keystone species in the KT-LEB and can live for more than 300 years. In this study, we find that trees in the riparian zone exhibit larger and more diffuse vessels compared to trees on the flood plain. 14C dating indicates that clear temporal variations in vessel size and density are synchronous across trees at the same site and consistent with changes in hydrological conditions recorded in instrumental records. More diffuse and larger vessels in the floodplain trees are congruous with wetter events, while bands of wood with smaller and denser vessels co-occur with drier conditions. These results suggest the species has potential as a high-resolution, albeit not annual, palaeohydrological indicator in the semi arid–arid zone - potentially a major step forward in deriving palaeohydrological tree-ring records for this region.

中文翻译：

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河岸桉树可以用于水文气候重建吗？Eucalyptus coolabah 定义古洪水事件的案例

摘要 在澳大利亚半干旱-干旱区，水文记录通常只有 40-60 年之久，无法了解长期水文变率。Kati-Thanda – 艾尔湖盆地 (KT-LEB) 是世界第五大终点湖，水流变化很大，支持无数动植物。KT-LEB 树木的机会主义和高度不规则的生长意味着该地区尚未开发树木年轮记录。E.coolabah 是 KT-LEB 中的关键物种，可以存活 300 多年。在这项研究中，我们发现与洪泛区的树木相比，河岸区的树木表现出更大、更分散的血管。14C 测年表明，船舶大小和密度的明显时间变化在同一地点的树木之间是同步的，并且与仪器记录中记录的水文条件变化一致。泛滥平原树木中更分散和更大的血管与更潮湿的事件一致，而具有更小和更密集血管的木材条带与更干燥的条件共同发生。这些结果表明，该物种有潜力作为半干旱-干旱区的高分辨率古水文指标，尽管不是一年一度的，这可能是推导该地区古水文树木年轮记录的重要一步。