Australia’s Murray-Darling Basin (MDB) is an agriculturally and ecologically valuable region impacted by water abstraction and climate change. Black Box (Eucalyptus largiflorens (Myrtaceae)), an important floodplain tree largely endemic to the Basin is of concern because its overall condition is sub-optimal. Knowledge about key aspects of Black Box tree function such as mineral nutrition remains limited. This field study examined the latter by measuring essential plant nutrients, aluminium, and soil chemistry over 12 months spanning an environmental water release event. Samples were collected 4–8 weekly from mature trees on loamy sands of the Hattah Lakes system in north-western Victoria. This commenced prior to water release, continuing through peak levels at the study sites, to recession. Paired leaf and soil samples were obtained from/beneath mature trees at 8 time-points in 2017–2018. Flooding induced mostly temporary soil chemical changes in the surface horizon, which enhanced trace-nutrient access to trees. Results suggest that the short-term flooding of Black Box on drained loamy sands likely provides nutritional advantage by generating soil chemical fluxes. They also raise questions about flooding-induced movement of nutrients through the soil profile, and about the combined effects of pedology and duration of flooding on the nutritional health of Black Box.

澳大利亚的墨累达令盆地（MDB）是受水源抽取和气候变化影响的具有农业和生态价值的地区。黑匣子（桉树largiflorens（桃金娘科）），这是该盆地特有的重要洪泛平原树，因为其总体状况欠佳。关于黑匣子树功能的关键方面（例如矿物质营养）的知识仍然有限。这项现场研究通过测量环境水释放事件中12个月内必需的植物养分，铝和土壤化学成分，对后者进行了研究。每周4-8次从维多利亚州西北部Hattah Lakes系统的质壤沙上的成熟树木中收集样品。这是在水释放之前开始的，一直持续到研究地点的峰值水平，直至衰退。在2017-2018年的8个时间点，从成熟树木/下方的成熟树木下获取了成对的叶子和土壤样品。洪水在表层引起了大部分土壤化学的暂时变化，从而增加了微量养分进入树木的机会。结果表明，在排水的壤土沙土上短期注入黑匣子可能通过产生土壤化学通量而提供营养优势。他们还提出了以下问题：水淹引起的养分在土壤中的运动，以及土壤学和水淹持续时间对黑匣子营养健康的综合影响。