Abstract
AbstractHuman activities have increased the input of nitrogen and phosphorus into riverine systems. These inputs can increase algal growth that degrades aquatic ecosystems. We constructed a global database of diffuse loads (kg) and yields (kg ha−1 yr−1) of dissolved and total nitrogen and phosphorus forms for 7 years (centred around 2008) in 1,421 catchments. Yields were calculated from 640,950 measurements that were checked, filtered and harmonized from readily available sources. We used the yield data to create a georeferenced model to calculate yields of nitrogen and phosphorus forms across 6,020 catchments, globally. The database can be used to assess and inform policy to reduce nitrogen and phosphorus losses from land to freshwater, improve nutrient use efficiency on farms, and help calibrate global models being used to explore scenarios such as nutrient management efficiency in a changing climate. The source data and R code are provided at https://doi.org/10.25400/lincolnuninz.11894697.
Highlights
The loads and annual yields of nitrogen (N) and phosphorus (P) are key factors controlling the eutrophication of streams and rivers (Dodds and Smith, 2016)
Nutrients can originate from point and non-point sources
|2 non-point sources, otherwise known as diffuse sources, reflect how a range of climate and catchment characteristics interact with land use decisions (Carpenter et al, 1998; Álvarez et al, 2017)
Summary
The loads (kg) and annual yields (kg ha−1 yr−1) of nitrogen (N) and phosphorus (P) are key factors controlling the eutrophication of streams and rivers (Dodds and Smith, 2016). We combined these data with data on catchment characteristics and land use in a model to estimate the load and yield of these nutrient forms across the globe.
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