title: Abiotic gas formation drives nitrogen loss from a desert ecosystem.
abstract: In arid environments such as deserts, nitrogen is often the most limiting nutrient for biological activity. The majority of the ecosystem nitrogen flux is typically thought to be driven by production and loss of reactive nitrogen species by microorganisms in the soil. We found that high soil-surface temperatures (greater than 50 degrees C), driven by solar radiation, are the primary cause of nitrogen loss in Mojave Desert soils. This abiotic pathway not only enables the balancing of arid ecosystem nitrogen budgets, but also changes our view of global nitrogen cycling and the predicted impact of climate change and increased temperatures on nitrogen bioavailability.
authors.affiliation: Department of Ecology and Evolutionary Biology, Corson Hall Room E149, Cornell University, Ithaca, NY 14853, USA. ckm27@cornell.edu
authors.forename: Carmody K
authors.initials: CK
authors.lastname: McCalley
authors.forename: Jed P
authors.initials: JP
authors.lastname: Sparks
mesh_terms: D000641:Ammonia / Q000032:analysis*; D003889:Desert Climate; D017753:Ecosystem; D005740:Gases; D006358:Hot Temperature; D032442:Larrea; D009589:Nitrogen Oxides / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D015206:Southwestern United States; D013472:Sunlight
chemical_list: D005740:Gases; D009589:Nitrogen Oxides; D012987:Soil; D000641:Ammonia