Dr Naomi Wells
I use light stable isotopes to understand the fate and transport of key nutrients across biomes, landscapes, and scales.
Projects I've run range from measuring the ecological recovery of urban rivers after an earthquake, identifying how rice farmers can manage their fields to maximize nutrient retention/ minimize pollution, developing methods for calculating how New Zealand dairy farms impact water health, and assessing how natural 'clean up' of groundwater pollution in historic industrial sites can be strengthened.
My goal is to continue developing cutting-edge scientific tools capable of answering questions of fundamental human importance. Current projects include:
- How interactions between land use and hydrology control coastal greenhouse gas emissions
- Organic nitrogen mobility across hydrologic gradients
- Phosphate isotopes as indicators of phosphorus v. nitrogen mobility in sub-tropical estuaries.
Wells NS, Hakoun V, Brouyère S, Knöller K (2016) Multi-species measurements of nitrogen isotopic composition reveal the spatial constraints and biological drivers of ammonium attenuation across a highly contaminated groundwater system. Water Research 98: 363-375
Wells NS, Baisden WT, Horton T, Clough TJ (2016) Spatial and temporal variations in nitrogen export from a New Zealand pastoral catchment revealed by streamwater nitrate isotopic composition. Water Resources Research 52: 2840-2854
Coban O, Kuschk P, Wells NS, Strauch G, Knöller K (2015) Microbial nitrogen transformations in constructed wetlands treating contaminated groundwater. Environmental Science and Pollution Research 22(17): 12892-12839
Wells NS, Baisden WT, Clough TJ (2015) Ammonia volatilisation is not the dominant factor in determining the isotopic composition of soil nitrate in pasture systems. Agriculture, Ecosystems, and the Environment 199: 290-300
Wells NS, Clough TJ, Johnson-Beebout SE, Buresh RJ (2014) Land management between crops affects soil inorganic nitrogen balance in a tropical rice system Nutrient Cycling in Agroecosystems 100(3): 315-332
Wells NS, Baggs EM (2014) Char amendments impact soil N2O production during ammonia oxidation Soil Science Society of America Journal 78(5): 1656-1660
Wells NS, Clough TJ, Condron LM, Baisden WT, Harding JS, Dong Y, Lewis GD, Lear G (2013) Biogeochemistry and community ecology in a spring-fed urban river following a major earthquake.Environmental Pollution 182: 190-200
Clough TJ, Bertram JE, Ray JL, Condron LM, O'Callaghan M, Sherlock RR, Wells NS (2010) Impact of an unweathered wood biochar on emissions of N2O from a bovine-urine amended pasture soil. Soil Science Society of America Journal 74(3): 852-860
Bertram JE, Clough TJ, Ray JL, Condron LM, O'Callaghan M, Sherlock RR, Wells NS, Ray JL (2009) Hippuric acid and benzoic acid inhibition of ruminant urine N2O emissions Global Change Biology 15(8): 2067-2077
In preparation for submission in 2016:
Wells NS, Clough TJ, Johnson-Beebout SE, Elberling B, Baisden WT. Constraints on the strength of nitrate isotope fractionation during denitrification in freshwater systems.
Clagnan E, Thornton SF, Rolfe SA, Wells NS, Knöller K, Murphy J, Lawless A, Tuohy P, Fenton O. Insights into surface and subsurface nitrogen source and attenuation on an intensive dairy farm in south-east Ireland.
Wells NS, Kappelmeyer U, Knöller K. Temporal and spatial variations in nitrogen attenuation pathways across an ammonium plume.