氢氧稳定同位素是描述水循环过程的天然示踪剂,自来水是重要的生活用水,研究自来水中氢氧稳定同位素的变化特征有助于示踪城乡居民用水来源,为合理规划水资源调配提供参考。基于新疆352个自来水样品,对氢氧稳定同位素以及氘盈余（d=δ²H-8δ¹⁸O）的时空分布进行分析。结果表明：（1） 新疆自来水水线为δ²H=7.67δ¹⁸O+10.54（R²=0.92）,δ²H月均值的变化范围为-105.57‰~-37.82‰,δ¹⁸O的月均值在-14.48‰~-6.67‰之间,d的月均值在1.89‰~24.38‰之间波动。（2） 北疆和南疆的氢氧稳定同位素及氘盈余都存在季节变化,并且南疆的季节差异比北疆大。（3） 利用BW模型对新疆自来水中氢氧稳定同位素的空间分布进行模拟,发现南疆氢氧稳定同位素值普遍高于北疆的同位素值,并且山区同位素值低于盆地的同位素值。

Stable hydrogen and oxygen isotopes are natural tracers reflecting the water cycle process, and tap water is an important domestic water source. The variation of stable hydrogen and oxygen isotopes in tap water is useful for tracing sources of domestic water supply and provides a reference for rational water resource management. The measured isotopic data of 352 tap water samples in Xinjiang were applied to analyze the spatiotemporal variation of stable hydrogen and oxygen isotopes as well as deuterium excess (d-excess; d = δ²H - 8δ¹⁸O) in tap water. The results show that the d-excess of the tap water line in Xinjiang is δ²H = 7.67δ¹⁸O + 10.54 (R² = 0.92). The value of δ²H ranges from -105.57‰ to -37.82‰ on a monthly basis, and δ¹⁸O ranges from -14.48‰ to -6.67‰. The d-excess fluctuates from 1.89‰ to 24.38‰. The stable hydrogen and oxygen isotopes, as well as d-excess, exhibit seasonal variation in both northern and southern Xinjiang, and the seasonal difference in southern Xinjiang is greater than that in northern Xinjiang. The BW model is applied to map the stable hydrogen and oxygen isotopes in tap water. Tap water in southern Xinjiang presents higher isotopic values than northern Xinjiang, and water in the mountainous regions shows lower isotopic values than does water in the low-lying basins.