Dataset of nitrogen in rivers and streams in sub-Saharan Africa

This is a dataset on concentrations and export of all nitrogen compounds in rivers and streams in sub-Saharan Africa reported in scientific literature (n=254) until July 2024. Data are aggregated by site and, where possible, data are reported for the dry and wet season separately. In addition to concentrations and export of nitrogen compounds, data on ancillary parameters, such as pH, electrical conductivity and dissolved oxygen area also included. Each site for which (approximate) coordinates could be extracted from the original study was assigned to a land cover class based on open source data on tree cover and the extent of cropland, settlement and wetlands across Africa (see second tab in the file 'Dataset.xlsx' for land cover classes and corresponding classification conditions as well as data sources). The third tab in the file 'Dataset.xlsx' contains links to the individual studies and full references are provided in the file 'Reference list.pdf'.本数据集收录了截至2024年7月、已发表于科学文献的撒哈拉以南非洲地区河流与溪流中各类氮化合物浓度与输出负荷相关数据，共计n=254项研究。数据按站点进行聚合，且在条件允许时，分别提供旱季与雨季的观测数据。除各类氮化合物的浓度与输出负荷外，数据集同时涵盖pH值、电导率与溶解氧等辅助水质参数。对于可从原始研究中提取（近似）坐标的每个站点，本数据集基于非洲地区林木覆盖、农田、聚落与湿地的开源空间数据，将其划归至对应土地覆盖类别；土地覆盖类别、对应分类条件及数据来源详见'Dataset.xlsx'文件的第二个工作表。'Dataset.xlsx'文件的第三个工作表包含各原始研究的链接，完整参考文献列表则收录于'Reference list.pdf'文件中。