中文摘要：

土壤水是水循环的重要组成部分,其氢氧同位素组成在生态学、环境学、水文学等领域有着广泛应用。不同的提取水方法存在较大偏差,因此本研究建立了加速溶剂萃取（ASE）提取-同位素质谱（IRMS）分析土壤水中氢氧同位素的方法。ASE提取土壤水的条件是：萃取溶剂二氯甲烷,萃取温度100℃,萃取压力10.3 MPa,静态萃取时间10 min,重复提取3次,循环次数分别为4,4和3次,合并提取土壤水并经活性炭固相萃取柱（SPE）净化后,利用同位素比质谱分析土壤水的氢氧同位素组成。与过注水相比,提取土壤水的δD增加2.12‰~4.58‰,δ^18O增加-0.17‰~0.93‰,氢氧同位素的分析精度分别为0.89‰和0.37‰。

英文摘要：

Soil water is one of the most important components in hydrological cycle. The stable hydrogen and oxygen isotopes in soil water have been increasingly used in the ecological, environment and hydrological research. In view of different techniques for extracting soil water, there is significant difference in the δD and δ^18O composition. This paper presents a method for analyzing hydrogen and oxygen isotopes in soil water by using elemental analyzer and isotope ratio mass spectrometry with accelerated solvent extraction for sample pretreatment. The conditions are： extraction solvent： dichloromethane, temperature： 100℃, pressure of 10.3 MPa, static time： 10 min. The samples were extracted three times, and with cycle values of four, four and three, respectively. Comparing with the added water, the deuterium and oxygen isotope values in the extracted soil water enrich 2.12%e-4.58%e and 0.17%e-0.93%e, respectively. The reproducibility of replicate extractions of soil water is around ±0.89%e for δD and ±0.37%e for δ^18O.