Tamarix ramosissima is a dominant species in desert ecosystems and an ecological barrier species in arid areas, playing a crucial role in stabilizing dunes and preventing desertification. In this study, river water, groundwater, soil water, and T. ramosissima individual samples were collected from three sites in July and October 2023 at the Daliyaboyi Oasis located at the tail of the Kriya River in the hinterland of the Taklamakan Desert. The three sites are referred to as the center (SE), west (SW), and north (SN) sites within the Daliyaboyi Oasis, and each experienced different flood frequencies. The SE site experienced flooding in July and October, the SW site experienced flooding only in July, and the SN site experienced no flooding in July or October. The spatial and temporal variation in hydrogen and oxygen stable isotopes and line-conditional excess (lc-excess) in water and plant samples were analyzed, and the potential changes in water use of T. ramosissima were analyzed by the hydrogen and oxygen stable isotope and MixSIAR model. The findings indicated that the slope of SWL at the SE, SW, and SN sites was higher in July (6.77, 6.42, and 3.05, respectively) than in October (7.37, 3.30, and 2.14, respectively). The lc-excess value of the SE site did not exhibit seasonal changes; only the lc-excess values of soil water in SW and SN sites showed seasonal changes. MixSIAR results indicated frequent flood events at the SE site, with relatively constant proportions of water source utilization by T. ramosissima in July and October. In addition, shallow soil water (0–60 cm) and deeper soil water (60–80 cm) were the main water sources of T. ramosissima at SE. The SN site was slightly influenced by surface water, resulting in statistically non-significant changes in the water source utilization by T. ramosissima. Indeed, deep soil water (60–200 cm) and groundwater were the sources of water for T. ramosissima at this site. In contrast with October, the SW site experienced flood events in July, resulting in the utilization of water by T. ramosissima from the shallow soil (0–60 cm) and deep soil (60–280 cm) in July and October, respectively. Different surface water flow patterns led to different water use characteristics of T. ramosissima, which further demonstrated that T. ramosissima has high resilience and ecological plasticity. This work provides a useful reference for the implementation of effective ecological water transport measures in the Daliyaboyi Oasis and similar arid habitats.

中文翻译：

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不同地表水流频次对塔克拉玛干沙漠腹地柽柳水分利用特性的影响


柽柳（Tamarix ramosissima）是荒漠生态系统的优势种，也是干旱地区的生态屏障物种，在稳定沙丘和防止荒漠化方面发挥着至关重要的作用。在这项研究中，于 2023 年 7 月和 2023 年 10 月在位于塔克拉玛干沙漠腹地克里亚河尾部的 Daliyaboyi 绿洲的三个地点收集了河水、地下水、土壤水和 T. ramosissima 个体样本。这三个地点被称为 Daliyaboyi Oasis 内的中心 （SE）、西部 （SW） 和北部 （SN） 站点，每个站点都经历了不同的洪水频率。SE 站点在 7 月和 10 月经历了洪水，SW 站点仅在 7 月经历了洪水，SN 站点在 7 月或 10 月没有经历洪水。分析了水和植物样品中氢和氧稳定同位素和线条件过量 （lc-excess） 的时空变化，并通过氢和氧稳定同位素和 MixSIAR 模型分析了 T. ramosissima 用水的潜在变化。结果表明，7 月 SE 、 SW 和 SN 站点的 SWL 斜率 （分别为 6.77 、 6.42 和 3.05） 高于 10 月 （分别为 7.37 、 3.30 和 2.14）。SE 站点的 lc-excess 值未表现出季节性变化;只有 SW 和 SN 站点土壤水分的 LC-Excess 值表现出季节性变化。MixSIAR 结果表明 SE 站点频繁发生洪水事件，7 月和 10 月，T. ramosissima 的水源利用比例相对恒定。此外，浅层土壤水 （0–60 cm） 和深层土壤水 （60–80 cm） 是 T. ramosissima 在 SE 的主要水源。 SN 位点受地表水影响较小，导致 T. ramosissima 的水源利用变化无统计学意义。事实上，深层土壤水 （60-200 cm） 和地下水是该地点 T. ramosissima 的水源。与 10 月相比，西南地区在 7 月经历了洪水事件，导致 T. ramosissima 分别在 7 月和 10 月从浅层土壤 （0-60 cm） 和深层土壤 （60-280 cm） 中利用了水分。不同的地表水流模式导致 T. ramosissima 不同的水分利用特性，进一步证明了 T. ramosissima 具有较高的恢复能力和生态可塑性。本工作为 Daliyaboyi 绿洲及类似干旱生境实施有效的生态输水措施提供了有益参考。