Stable isotope (2H and 18O) depth profiles of pore waters and inferred soil physical parameters in the Attert catchment, Luxembourg

Depth profiles of stable water isotopes in the soil provide important information on flow and transport processes in the subsurface. We sampled depth profiles of stable water isotopes (2H and 18O) in the pore waters on two occasions at 46 sites in the Attert catchment, Luxembourg and are partly located in mixed deciduous forest and partly on grassland. These sites correspond to the sensor cluster sites of the DFG research unit CAOS. Sampling took place once between February 2012 and October 2013 and once in June 2014. Sampling procedure: We took 1-3 soil cores of 8 cm diameter in close proximity with a percussion drill (Atlas Copco Cobra, Stockholm, Sweden) at each study site within a radius of 5 m from the soil moisture sensor profiles. We drilled as deep as possible and divided the extracted soil cores into subsamples of 5 to 10 cm length and sealed the material in air tight bags (Weber Packaging, Güglingen, Germany). The soil sample depths were corrected for compaction during the drilling pro-cess and are provided as the mean depth of 5 or 10 cm soil core subsamples. For isotope analyses of the pore water, we used the direct equilibration method (Wassenaar et al., 2008). Analyses were carried out at the Chair of Hydrology, University of Freiburg. We provide detailed information about the laboratory analyses in Sprenger et al. (2015) and Sprenger et al. (2016) and the data description associated with the data.

土壤中稳定水同位素的深度剖面可为地下水流与运移过程提供关键信息。本研究于卢森堡阿泰尔特流域（Attert catchment）的46个采样点分两次采集了孔隙水中稳定水同位素（²H和¹⁸O）的深度剖面数据；这些采样点部分位于落叶混交林，部分为草地，且均隶属于德国研究基金会（DFG）CAOS研究单元的传感器集群站点。两次采样分别为2012年2月至2013年10月间的一次作业，以及2014年6月的一次作业。采样流程如下：在每个研究站点的土壤湿度传感器剖面半径5米范围内，使用冲击式钻机（Atlas Copco Cobra，瑞典斯德哥尔摩）采集1~3枚直径8 cm的土芯；尽可能深地钻孔后，将取出的土芯切割为5~10 cm长度的子样品，并封装于气密袋中（Weber Packaging，德国居格林根）。土层采样深度已针对钻井过程中的压实效应进行校正，数据以5 cm或10 cm土芯子样品的平均深度给出。孔隙水的同位素分析采用直接平衡法（Wassenaar et al., 2008），分析工作在弗莱堡大学水文学系完成。实验室分析的详细信息可参见Sprenger et al. (2015)、Sprenger et al. (2016)及本数据集配套的数据说明文档。