SPRUCE Redox-Active Subsurface Organic Matter, Marcell Experimental Forest, Minnesota, 2023

This dataset contains measurements that report on the effects of the SPRUCE experimental treatments on redox-active organic matter (RAOM) reduction (Valenzuela and Cervantes, 2021). Measurements occurred at the SPRUCE Experiment site in the Marcell Experimental Forest in northern Minnesota, USA. This work is also a follow-up to Rush et al. (2021a) which investigated effects of temperature on RAOM reduction after two years of experimental warming (Rush et al. 2021b). This follow-up dataset addresses two main questions; (i) How does warming and elevated carbon dioxide (CO2) directly affect in situ RAOM reduction, and subsequent methane (CH4) and CO2 production, across the peat depth profile? and (ii) How has long-term warming and elevated CO2 changed the total RAOM pool, and subsequent CH4 and CO2 production, across the peat depth profile? This dataset reports electron shuttling capacity (a proxy for RAOM reduction; Keller, and Takagi, 2013) and carbon dioxide (CO2) and methane (CH4) concentrations both in one-week in situ incubations (2023-05-31 to 2023-08-01) and 42-day laboratory incubations from peat collected in 2023 (2023-05-31 to 2023-06-26). Laboratory incubations also measured acetate concentrations. The 2023 laboratory incubations were also compared with laboratory incubations conducted on peat collected in 2016 (Rush et al. 2021b). This dataset contains three data files in comma-separate (.csv) format. Additional metadata are provided: three data dictionaries and a file-level metadata file in comma separate (.csv) format and a user guide in PDF (*.pdf) format.

本数据集收录了SPRUCE实验处理对氧化还原活性有机质（redox-active organic matter, RAOM）还原过程影响的实测数据（Valenzuela与Cervantes，2021）。实测工作在美国明尼苏达州北部的马塞尔实验林（Marcell Experimental Forest）SPRUCE实验站点开展。本研究亦是Rush等（2021a）的后续工作，该前期研究探究了两年实验增温对RAOM还原过程的影响（Rush等，2021b）。本后续数据集旨在解答两个核心问题：（i）在泥炭剖面中，增温与二氧化碳（carbon dioxide, CO₂）浓度升高如何直接原位影响RAOM还原过程，以及后续甲烷（methane, CH₄）与CO₂的产生？（ii）长期增温与CO₂浓度升高如何改变泥炭剖面中的总RAOM库，以及后续甲烷与CO₂的产生？本数据集记录了电子穿梭能力（electron shuttling capacity，RAOM还原的替代指标；Keller与Takagi，2013）、CO₂与CH₄浓度，相关数据来自2023年的原位培养实验（2023-05-31至2023-08-01，为期1周），以及2023年采集泥炭样本后的42天实验室培养实验（2023-05-31至2023-06-26）。实验室培养实验同时测定了乙酸盐浓度。此外，本研究还将2023年的实验室培养结果与2016年采集泥炭样本开展的实验室培养结果进行了对比（Rush等，2021b）。本数据集包含3个逗号分隔格式（.csv）的数据文件。附加元数据包括：3份数据字典、1份逗号分隔格式的文件级元数据文件，以及1份PDF格式（*.pdf）的用户指南。