Data on carbon, nitrogen, and phosphorus forms in a north temperate river, Rivière du Nord, Québec, Canada, from 2017 to 2019

The Rivière du Nord was sampled at 13 sites along its mainstem once per season from summer 2017 to winter 2020. Sites are numbered by river kilometer (RKm) with the outlet being RKm 0. The dataset includes concentrations (ug/L or mg/L as noted) of total organic carbon, dissolved organic carbon, particulate organic carbon, total nitrogen, total dissolved nitrogen, nitrate, ammonium, dissolved organic nitrogen, total phosphorus, total dissolved phosphorus and particulate phosphorus. It also includes fluorescence metrics derived from PARAFAC EEMs: fluorescence intensities (in Raman units) of 5 dissolved organic matter components (C1-C5), and 5 indices (SUVA-254, CDOM, FI, b:a, HIX). We sampled an additional 12 sites to act as endmembers (5 mainly forested sites, 5 mainly agricultural sites, and 2 wastewater treatment plant measures). Data were used to calculate C:N:P stoichiometry in the paper "Different forms of carbon, nitrogen, and phosphorus influence ecosystem stoichiometry in a north temperate river across seasons and land uses" (https://doi.org/10.1002/lno.11960). Data were used to quantify changes in organic matter composition in the paper "Contrasting seasons and land uses alter riverine dissolved organic matter composition" (https://doi.org/10.1007/s10533-022-00979-9).北河（Rivière du Nord）于2017年夏季至2020年冬季期间，按季节对其干流的13个采样点位开展单次采样。采样点以河流公里数（river kilometer，缩写RKm）编号，河口位置对应RKm 0。本数据集涵盖总有机碳、溶解性有机碳、颗粒态有机碳、总氮、总溶解性氮、硝酸盐、铵态氮、溶解性有机氮、总磷、总溶解性磷与颗粒态磷的浓度（单位为微克每升或毫克每升，详见标注）。同时包含基于平行因子分析激发发射矩阵光谱（PARAFAC EEMs）推导的荧光参数：5种溶解性有机质组分（C1-C5）的荧光强度（以拉曼单位计），以及5项水环境光学指数——比紫外吸收值SUVA-254、有色溶解性有机质（CDOM）、荧光指数（FI）、b:a比值与腐殖化指数（HIX）。此外，研究团队额外布设12个采样点位作为端元（endmembers），其中5个以林地为主的点位、5个以农业用地为主的点位，以及2个污水处理厂监测点位。本数据集已被用于两篇学术研究论文：其一为《不同形态碳、氮、磷随季节与土地利用变化对北温带河流生态化学计量学的影响》（https://doi.org/10.1002/lno.11960），用于计算河流碳氮磷化学计量比；其二为《季节与土地利用差异改变河流溶解性有机质组成》（https://doi.org/10.1007/s10533-022-00979-9），用于量化河流有机质组成的变化特征。