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 (v4).

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. 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 and the file name of the data package readme include a version number which will be updated with future iterations of this data package. The data folder 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; (8) a folder of excitation emissions matrix (EEM) fluorescence and absorbance spectra in dissolved organic matter and EEMs processing instructions; (9) solid state carbon-13 and solution state phosphorus nuclear magnetic resonance (13-C NMR and 31-P NMR) data and methods; (10) benzene polycarboxylic acid (BPCA) concentration and stable isotope data; (11) FTICR-MS methods; (12) Inductively coupled plasma (ICP) data for total calcium, magnesium, iron, aluminum, potassium, phosphorus, sodium, and sulfur along with sodium hydroxide-ethylenediaminetetraacetic acid (sodium hydroxide-EDTA) extractable calcium, magnesium, iron, aluminum, potassium, phosphorus, and sulfur; (13) a folder of phosphorus, carbon, and nitrogen X-ray absorption near edge structure (P-XANES, N-XANES, C-XANES) data for samples and standards; (14) P-XANES, N-XANES, C-XANES methods; (15) molybdate reactive phosphorus; and (16) folder of high resolution characterization of organic matter via 21 Tesla Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) generated through the Environmental Molecular Sciences Laboratory (EMSL; https://www.pnnl.gov/environmental-molecular-sciences-laboratory). The FTICR folder contains .txt data files and a subfolder containing instruments for using Formularity (https://omics.pnl.gov/software/formularity) and an R script to process the data based on the user's specific needs. The metadata and protocols folder 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. The folder contains photos of the solid chars. All files are .csv, .txt, .pdf, .jpg, .jpeg, .R, .ref, or .mp4. The data package was originally published October 2022 (v1). It was updated April 2023 (v2; new data files), September 2023 (v3; new and corrected data files), and September 2024 (v4; new and added/updated files). Metadata files were also updated to reflect these changes. See the change history section in the readme for more details.

本数据集呈现了一项实验研究的结果，该研究旨在比较不同燃烧条件和原料下有机质化学成分的变化。数据集包含实验生成焦炭的固相和溶解相总体浓度及有机质表征数据。焦炭通过封闭马弗炉或开放式燃烧台制备，原料为四种不同植物物种，代表美国太平洋西北地区火灾频繁影响的植被类型。这些数据可用于比较不同燃烧条件对有机质化学性质的影响，助力深化对火灾后河流廊道潜在生物地球化学效应的理解。

本数据集包含一份数据包自述文件、一份数据字典（dd）、一份文件级元数据（flmd）、14段燃烧台视频、燃烧台视频元数据，以及三个文件夹：（A）数据；（B）元数据与协议；（C）照片。文件夹名称及数据包自述文件的文件名包含版本号，将随数据包后续迭代更新。

数据文件夹包含以下内容：（1）固相碳与固相氮数据；（2）溶解有机碳（DOC，以不可吹扫有机碳（non-purgeable organic carbon, NPOC）计量）与总溶解氮（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）安装方法；（7）激发发射矩阵（excitation emissions matrix, EEM）方法信息；（8）溶解有机质中激发发射矩阵（EEM）荧光与吸收光谱文件夹及EEM处理说明；（9）固态碳-13与溶液态磷核磁共振（13-C NMR和31-P NMR）数据及方法；（10）苯多羧酸（benzene polycarboxylic acid, BPCA）浓度与稳定同位素数据；（11）傅里叶变换离子回旋共振质谱（FTICR-MS）方法；（12）电感耦合等离子体（Inductively coupled plasma, ICP）测定的总钙、镁、铁、铝、钾、磷、钠、硫数据，以及氢氧化钠-乙二胺四乙酸（sodium hydroxide-ethylenediaminetetraacetic acid, sodium hydroxide-EDTA）可提取的钙、镁、铁、铝、钾、磷、硫数据；（13）样品与标准品的磷、碳、氮X射线吸收近边结构（X-ray absorption near edge structure, XANES）数据文件夹（含P-XANES、N-XANES、C-XANES数据）；（14）P-XANES、N-XANES、C-XANES方法；（15）钼酸盐反应性磷数据；（16）通过环境分子科学实验室（Environmental Molecular Sciences Laboratory, EMSL；网址：https://www.pnnl.gov/environmental-molecular-sciences-laboratory）生成的、利用21特斯拉傅里叶变换离子回旋共振质谱（FTICR-MS）对有机质进行高分辨率表征的数据文件夹。FTICR文件夹包含.txt数据文件，以及一个子文件夹，内含Formularity（https://omics.pnl.gov/software/formularity）工具和一份R脚本，可根据用户特定需求处理数据。

元数据与协议文件夹包含：（1）国际地质样本编号（international geo-sample number, IGSN）映射文件；（2）燃烧与实验室元数据；（3）燃烧协议；（4）实验室协议；（5）植被采集元数据；（6）植被采集协议。

照片文件夹包含固相焦炭照片。所有文件格式为.csv、.txt、.pdf、.jpg、.jpeg、.R、.ref或.mp4。数据包最初发布于2022年10月（v1），并于2023年4月（v2；新增数据文件）、2023年9月（v3；新增及修正数据文件）、2024年9月（v4；新增及更新文件）进行更新。元数据文件也同步更新以反映这些变化，详情见自述文件中的变更历史部分。