Advancing the Food-Energy–Water Nexus: Closing Nutrient Loops in Arid River Corridors
| Autor: | Ricardo González-Pinzón, Lydia H. Zeglin, Jingjing Wang, Jacob G. Mortensen, Clifford N. Dahm, David J. Van Horn |
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| Rok vydání: | 2016 |
| Předmět: |
Irrigation
Agricultural Irrigation 010504 meteorology & atmospheric sciences Nitrogen Growing season Wastewater 010501 environmental sciences 01 natural sciences Sink (geography) Nutrient Rivers Environmental Chemistry Fertilizers 0105 earth and related environmental sciences Hydrology geography geography.geographical_feature_category Aquatic ecosystem Environmental engineering Agriculture Phosphorus General Chemistry Arid Environmental science Seasons Water quality Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Environmental Science & Technology. 50:8485-8496 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/acs.est.6b01351 |
| Popis: | Closing nutrient loops in terrestrial and aquatic ecosystems is integral to achieve resource security in the food-energy-water (FEW) nexus. We performed multiyear (2005-2008), monthly sampling of instream dissolved inorganic nutrient concentrations (NH4-N, NO3-N, soluble reactive phosphorus-SRP) along a ∼ 300-km arid-land river (Rio Grande, NM) and generated nutrient budgets to investigate how the net source/sink behavior of wastewater and irrigated agriculture can be holistically managed to improve water quality and close nutrient loops. Treated wastewater on average contributed over 90% of the instream dissolved inorganic nutrients (101 kg/day NH4-N, 1097 kg/day NO3-N, 656 kg/day SRP). During growing seasons, the irrigation network downstream of wastewater outfalls retained on average 37% of NO3-N and 45% of SRP inputs, with maximum retention exceeding 60% and 80% of NO3-N and SRP inputs, respectively. Accurate quantification of NH4-N retention was hindered by low loading and high variability. Nutrient retention in the irrigation network and instream processes together limited downstream export during growing seasons, with total retention of 33-99% of NO3-N inputs and 45-99% of SRP inputs. From our synoptic analysis, we identify trade-offs associated with wastewater reuse for agriculture within the scope of the FEW nexus and propose strategies for closing nutrient loops in arid-land rivers. |
| Databáze: | OpenAIRE |
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