Organic matter concentration and composition of experimentally burned open air and muffle furnace vegetation chars across differing burn severity and feedstock types from Pacific Northwest, USA.

This dataset represents results from an experimental study designed to compare how the chemical composition of organic matter changes across different burn conditions and feedstock materials. The dataset provides both solid and dissolved phase bulk concentration and organic matter characterization data from experimentally generated chars. Chars were created in a closed muffle furnace or on an open burn table from four different feedstock species representing vegetation commonly impacted by fire regimes across the Pacific Northwest, USA. This data can be used to compare how different burn conditions may influence resultant organic matter chemistry and help further our understanding of potential biogeochemical impacts on river corridors post-fire. Future versions of this data package will be published with additional datasets including: major anions and cations, molybdate reactive phosphorus, dissolved total phosphorus, 21 Tesla Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS), benzene polycarboxylic acids (BPCAs) concentrations and compound specific isotopic values of 13C for each BPCA, nuclear magnetic resonance (NMR) for hydrogen and phosphorus, amino acid concentrations, anhydrosugar concentrations, X-ray absorption near edge structure (XANES) for nitrogen, carbon, and phosphorus, and X-ray photoelectron spectroscopy (XPS). This list is not exhaustive and additional analyses may be included in future releases of this data package. This dataset is comprised of one data package readme, one data dictionary (dd), one file level metadata (flmd), fourteen burn table videos, burn table video metadata and three folders containing (A) data; (B) metadata and protocols; and (C) photos. The folder names of Folder A, Folder B, and the data package readme include a version number which will be updated with future iterations of this data package. Folder A includes (1) solid carbon and solid nitrogen; (2) dissolved organic carbon (DOC, measured as non-purgeable organic carbon, NPOC) and total dissolved nitrogen (TN); (3) pH; (4) thermocouple time series temperature; (5) methods codes; (6) installation methods; (7) excitation emissions matrix (EEM) methods information; and (8) a folder of excitation emissions matrix (EEM) fluorescence and absorbance spectra in dissolved organic matter and EEMs processing instructions. Folder B includes (1) international geo-sample number (IGSN) mapping file (2) burn and laboratory metadata; (3) burn protocol; (4) laboratory protocol; (5) vegetation collection metadata; and (6) vegetation collection protocol. Folder C contains photos of the solid chars. All files are .csv, .txt, .dat, .pdf, .jpg, .jpeg, or .mp4.

本数据集源自一项对比不同燃烧条件与原料材质下有机质化学成分变化规律的实验研究成果。本数据集涵盖实验制备炭的固相与溶解相整体组分浓度数据，以及有机质表征数据。实验所用炭材以美国太平洋西北地区受火灾影响频发的四种典型植被原料，分别在密闭马弗炉（muffle furnace）与开放式燃烧台（open burn table）两种条件下制备得到。本数据集可用于对比不同燃烧条件对最终有机质化学特征的影响，有助于深化我们对火灾后河流廊道潜在生物地球化学影响的认知。

本数据集包的后续版本将追加发布更多配套数据集，涵盖：主要阴、阳离子，钼反应性磷（molybdate reactive phosphorus），溶解总磷（dissolved total phosphorus），21特斯拉傅里叶变换离子回旋共振质谱（21 Tesla Fourier transform ion cyclotron resonance mass spectrometry, FTICR-MS），苯多羧酸（benzene polycarboxylic acids, BPCAs）浓度及其单体13C特异性同位素值，氢、磷核磁共振（nuclear magnetic resonance, NMR）数据，氨基酸浓度，脱水糖浓度，氮、碳、磷的X射线吸收近边结构（X-ray absorption near edge structure, XANES）光谱，以及X射线光电子能谱（X-ray photoelectron spectroscopy, XPS）数据。上述新增数据集并非全部，本数据集包的后续发布版本还可能纳入更多分析内容。

本数据集包含1份数据集包说明文档、1份数据字典（dd）、1份文件级元数据（flmd）、14段燃烧台视频及燃烧台视频元数据，同时包含3个文件夹，分别为（A）数据文件夹、（B）元数据与实验方案文件夹、（C）照片文件夹。文件夹A、文件夹B的命名以及数据集包说明文档均包含版本号，后续本数据集包更新迭代时将同步更新该版本号。

文件夹A包含以下内容：(1) 固相碳与固相氮数据；(2) 溶解有机碳（dissolved organic carbon, DOC，以不可吹扫有机碳non-purgeable organic carbon, NPOC表征）与总溶解氮（total dissolved nitrogen, TN）数据；(3) pH值数据；(4) 热电偶时间序列温度数据；(5) 方法代码；(6) 安装方案；(7) 激发发射矩阵（excitation emissions matrix, EEM）方法说明；(8) 包含溶解有机质激发发射矩阵荧光与吸收光谱数据，以及EEM处理指南的子文件夹。

文件夹B包含以下内容：(1) 国际地质样本编号（international geo-sample number, IGSN）映射文件；(2) 燃烧实验与实验室元数据；(3) 燃烧实验规程；(4) 实验室操作规程；(5) 植被采样元数据；(6) 植被采样规程。

文件夹C包含固相炭材的相关照片。本数据集所有文件格式为.csv、.txt、.dat、.pdf、.jpg、.jpeg或.mp4。