Dong Z, Xu Y, Liu S, Li G, Ye M, Ma X, Li S
College of Life Science, Xinjiang Normal University, Urumqi, China.
Xinjiang Key Laboratory of Special Species Conservation and Regulatory Biology, Urumqi, China.
Plant Biol (Stuttg). 2024 Oct;26(6):1057-1066. doi: 10.1111/plb.13695. Epub 2024 Jul 16.
Tamarix ramosissima has an important role in stabilizing sand dunes in desert ecosystems. Understanding the water use strategies of T. ramosissima is essential to understand its adaptations on coppice dunes. We utilized the stable isotopes δH and δO in soil water, groundwater, and xylem water to identify monthly differences in water sources. Additionally. we explored rooting depth using HO as an artificial tracer. In May, T. ramosissima derived 75% of its water from shallow and middle soil layers. In July, it absorbed 90% water from middle and deep soil layers. In August and September, it acquired approximately 80% of its water from deep soil layers. The labelling using H as an artificial tracer indicated that the root system of T. ramosissima could reach depths >500 cm in the coppice dunes. H absorption was observed at depths of 100, 200, 300 and 400 cm. Soil water is the dominant water source for T. ramosissima in the coppice dunes because groundwater is at depths >30 m. The flexible water-use strategies of T. ramosissima enable it to effectively utilize different available water sources to adapt to the arid environment. These findings improve our understanding of water uptake patterns and drought adaptation strategies of T. ramosissima in the coppice dunes of desert ecosystems.
多枝柽柳在沙漠生态系统的沙丘稳定中起着重要作用。了解多枝柽柳的水分利用策略对于理解其在灌丛沙丘上的适应性至关重要。我们利用土壤水、地下水和木质部水中的稳定同位素δH和δO来确定水源的月度差异。此外，我们使用HO作为人工示踪剂来探究根系深度。5月，多枝柽柳75%的水分来自浅层和中层土壤层。7月，它从中层和深层土壤层吸收90%的水分。8月和9月，它约80%的水分来自深层土壤层。使用H作为人工示踪剂的标记表明，多枝柽柳的根系在灌丛沙丘中可深达>500厘米。在100、200、300和400厘米深度处观察到了H吸收。由于地下水深度>30米，土壤水是多枝柽柳在灌丛沙丘中的主要水源。多枝柽柳灵活的水分利用策略使其能够有效利用不同的可用水源以适应干旱环境。这些发现增进了我们对多枝柽柳在沙漠生态系统灌丛沙丘中的水分吸收模式和干旱适应策略的理解。
