Growing Season D and 18O isotope data for a core from the center and moat of the BBC collapse scar: Bonanza Creek Experimental Forest Flood Plains

This data set contains D and 18O data for a core from the center and moat (0 and 6 m) of the BBC collapse scar. Two well-preserved cores from the center of the bog was collected in March 2003 with a gasoline-powered permafrost corer. Cores were stored frozen and sampled using a radial saw. The core was sampled every two cm for macrofossil, diatom analysis and chemistry.
Oxygen isotope ratios in aquatic cellulose has been shown to be a reliable tracer of lakewater isotope ratios (Sauer et al., 2001). I predicted that ?D and ?18O signatures in Sphagnum leaves would respond to enrichment and depletion in the bog water over time, providing an independent line of evidence for diatom-inferred hydrologic change.
All isotope samples were processed by the Alaska Stable Isotope Facility using a Thermo Finnigan TC EA and Deltaplus XL mass spectrometer (Thermo Electron Corporation, Bremen, Germany) in continuous flow mode. Data were reported relative to standard mean ocean water (SMOW). Instrument precision was 1.2 ? SE for ?D and 0.3 ? SE for ?18O. I separated Sphagnum leaves from the bog and moat cores, and ran whole organic matter samples for ?D and ?18O stable isotopes.
To determine the correlation between ?D and ?18O stable isotopes in peat leaves and bog water, I analyzed samples of Sphagnum and adjacent surface water. I collected surface water samples without headspace and refrigerated at 4 ?C until sample analysis. Snow samples were kept frozen until analysis. I refrigerated surface sample Sphagnum leaves from branches directly below the capitulum after harvest until analysis for ?D and ?18O stable isotopes. I identified Sphagnum samples to species.

This data set was collected to relate ?D and ?18O to fires, changes in succession, changes in hydrology, and diatom assemblages.

本数据集涵盖取自BBC塌陷疤痕中心与环沟（深度分别为0米与6米）处的泥炭岩芯的氘（deuterium, D）与氧18（oxygen-18, ¹⁸O）同位素数据。2003年3月，研究团队使用汽油动力冻土取芯器采集了两例保存完好的沼泽中心岩芯。岩芯以冷冻状态保存，并通过径向锯进行分样。该岩芯以每2厘米为间隔取样，用于大型化石、硅藻分析与化学组分检测。
水生纤维素中的氧同位素比值已被证实是湖水同位素比值的可靠示踪剂（Sauer等，2001）。本研究推测，泥炭藓（Sphagnum）叶片中的δD与δ¹⁸O同位素信号会随时间响应沼泽水体的富集与耗竭过程，从而为基于硅藻推断的水文变化提供独立佐证证据。
所有同位素样品均由阿拉斯加稳定同位素实验室（Alaska Stable Isotope Facility）采用连续流模式，通过Thermo Finnigan TC EA与Deltaplus XL质谱仪（德国不来梅赛默飞世尔科技公司）完成分析。同位素数据以标准海洋平均水（standard mean ocean water, SMOW）为参比标准进行报告。仪器精度为：δD的标准误（SE）为±1.2‰，δ¹⁸O的标准误为±0.3‰。研究者从沼泽与环沟岩芯中分离出泥炭藓叶片，并对全有机质样品开展δD与δ¹⁸O稳定同位素分析。
为明确泥炭叶片中δD与δ¹⁸O稳定同位素与沼泽水体间的相关性，本研究分析了泥炭藓样品与邻近地表水样品。地表水样品采集时无顶空，并在4℃条件下冷藏直至分析；雪样全程保持冷冻状态直至分析。研究者将采集自头状花序下方枝条的地表泥炭藓样品冷藏，直至开展δD与δ¹⁸O稳定同位素分析，并对所有泥炭藓样品进行物种鉴定。
本数据集的采集旨在建立δD与δ¹⁸O同位素信号与火灾事件、群落演替变化、水文改变以及硅藻组合之间的关联。