Dataset on environmental characteristics of the sampling sites in the Western Guangdong–Beibu Gulf shelf, and observational and historicalin situ denitrification and anammox rates, the proportion of anammox to total nitrogen removal in sediments

This dataset comprises three Excel files supporting the study of sedimentary reactive nitrogen removal and nitrous oxide production in the western Guangdong–Beibu Gulf continental shelf. The first file, “Supplementary dataset 1,” is a compilation of published sediment nitrogen-removal measurements from continental shelves, lagoons, estuaries, and gulfs worldwide. It contains information on sampling location, geographic coordinates, water depth, bottom-water temperature, denitrification and anammox rates, and the relative contribution of anammox to total N2 production (ra). Where available, the shelf dataset also includes denitrification-derived N2O production and yield; direct denitrification supported by overlying-water nitrate (P14w); coupled nitrification–denitrification supported by sedimentary nitrification (P14n); bottom-water nitrate plus nitrite (NOx-) and ammonium (NH4+) concentrations; sediment total organic carbon (TOC), total nitrogen (TN), and chlorophyll a (Chl a); porewater NOx- and NH4+ concentrations; sediment oxygen consumption rates; and the corresponding literature references. The second file, “Source Data for Main Figures,” contains the numerical data underlying Figs. 1–3 of the main text. These data include sediment–water NOx- and NH4+ fluxes, sediment oxygen consumption rates, potential and in situ denitrification and anammox rates, the relative contribution of anammox to total nitrogen removal, denitrification-derived N2 and N2O production rates, N2O yields, and the contributions of direct denitrification and coupled nitrification–denitrification to total sediment nitrogen removal. It also includes vertical profiles of potential nitrogen-removal rates and N2O production in the sediment. Standard deviations are provided where applicable. The third file, “Source Data for Supplementary Figures,” contains the numerical data underlying Figs. S1, S2, S3, S5, S7, S8, and S9. It includes sampling-station coordinates and water depths; vertical profiles of sediment porosity and Chl a; porewater NOx-, NH4+, CO2, CH4, and N2O concentrations; comparisons between potential and in situ denitrification, anammox, N2O production, and N2O yields; sediment–water NOx- fluxes and direct denitrification rates; environmental variables used to examine controls on N2O production and yield; surface- and bottom-water N2O concentrations; and water-column temperature and salinity profiles. Standard deviations are provided where applicable, and blank cells indicate unavailable or missing data.本数据集包含三份Excel文件，用于支撑粤西-北部湾大陆架沉积活性氮去除与氧化亚氮产生相关研究。 首个文件“补充数据集1”汇编了全球大陆架、泻湖、河口及海湾已发表的沉积氮去除实测数据。内容涵盖采样地点、地理坐标、水深、底层水温、反硝化（denitrification）与厌氧氨氧化（anammox）速率，以及厌氧氨氧化对总N₂产生量的相对贡献（rₐ）。若有相关数据，该大陆架数据集还包含反硝化来源的N₂O产生量与产率、由上覆水硝酸盐支撑的直接反硝化（P₁₄w）、由沉积物硝化支撑的耦合硝化-反硝化（P₁₄n）、底层水硝酸盐+亚硝酸盐（NOₓ⁻）与铵盐（NH₄⁺）浓度、沉积物总有机碳（total organic carbon, TOC）、总氮（total nitrogen, TN）与叶绿素a（chlorophyll a, Chl a）、孔隙水NOₓ⁻与NH₄⁺浓度、沉积物耗氧速率，以及对应的参考文献。 第二个文件“主图源数据”包含正文中图1至图3对应的数值数据。这些数据包括沉积物-水界面NOₓ⁻与NH₄⁺通量、沉积物耗氧速率、潜在与原位反硝化及厌氧氨氧化速率、厌氧氨氧化对总氮去除的相对贡献、反硝化来源的N₂与N₂O产生速率、N₂O产率，以及直接反硝化与耦合硝化-反硝化对总沉积氮去除的贡献。此外还包含沉积物中潜在氮去除速率与N₂O产生量的垂直剖面。若有适用情况，会提供标准差。 第三个文件“补充图源数据”包含补充图S1、S2、S3、S5、S7、S8及S9对应的数值数据。内容涵盖采样站坐标与水深、沉积物孔隙度与Chl a的垂直剖面、孔隙水NOₓ⁻、NH₄⁺、CO₂、CH₄与N₂O浓度、潜在与原位反硝化、厌氧氨氧化、N₂O产生量及N₂O产率的对比数据、沉积物-水界面NOₓ⁻通量与直接反硝化速率、用于探究N₂O产生量与产率调控因子的环境变量、表层与底层水N₂O浓度，以及水柱温度与盐度剖面。若有适用情况会提供标准差，空白单元格表示数据不可用或缺失。