Dataset for JGR.xlsx

This dataset contains the basic information of sampling sites, the measured EC values, DO concentrations, pH values, concentrations of nitrate and ammonium in each sampling sites; the measured total nitrogen (TN) contents, the δ¹⁵N values, and the nitrate reductase activity level of plant samples along the river; and the calculated fractional contribution of each N surces to plant TN, the absolute contribution of each N sources to plant TN, and the plant N preference from ammonium (NH₄⁺) to nitrate (NO₃^-) along the river sampling sites.