Advancing the Food-Energy-Water Nexus: Closing Nutrient Loops in Arid River Corridors. Mortensen, J. G., Gonzalez-Pinzon, R., Dahm, C. N., Wang, J., Zeglin, L. H., & Van Horn, D. J. Environmental Science & Technology, 50(16):8485–8496, August, 2016.
Advancing the Food-Energy-Water Nexus: Closing Nutrient Loops in Arid River Corridors [link]Paper  doi  abstract   bibtex   
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 similar to 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.
@article{mortensen_advancing_2016,
	title = {Advancing the {Food}-{Energy}-{Water} {Nexus}: {Closing} {Nutrient} {Loops} in {Arid} {River} {Corridors}},
	volume = {50},
	issn = {0013-936X},
	shorttitle = {Advancing the {Food}-{Energy}-{Water} {Nexus}: {Closing} {Nutrient} {Loops} in {Arid} {River} {Corridors}},
	url = {://WOS:000381654600009},
	doi = {10.1021/acs.est.6b01351},
	abstract = {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 similar to 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.},
	number = {16},
	journal = {Environmental Science \& Technology},
	author = {Mortensen, Jacob G. and Gonzalez-Pinzon, Ricardo and Dahm, Clifford N. and Wang, Jingjing and Zeglin, Lydia H. and Van Horn, David J.},
	month = aug,
	year = {2016},
	pages = {8485--8496}
}
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