Bromus tectorum invasion alters nitrogen dynamics in an undisturbed arid grassland ecosystem

Ecology
L J SperryR D Evans

Abstract

The nonnative annual grass Bromus tectorum has successfully replaced native vegetation in many arid and semiarid ecosystems. Initial introductions accompanied grazing and agriculture, making it difficult to separate the effects of invasion from physical disturbance. This study examined N dynamics in two recently invaded, undisturbed vegetation associations (C3 and C4). The response of these communities was compared to an invaded/ disturbed grassland. The invaded/disturbed communities had higher surface NH4+ input in spring, whereas there were no differences for surface input of NO3-. Soil inorganic N was dominated by NH4+, but invaded sites had greater subsurface soil NO3-. Invaded sites had greater total soil N at the surface four years post-invasion in undisturbed communities, but total N was lower in the invaded/disturbed communities. Soil delta15N increased with depth in the noninvaded and recently invaded communities, whereas the invaded/disturbed communities exhibited the opposite pattern. Enriched foliar delta15N values suggest that Bromus assimilated subsurface NO3-, whereas the native grasses were restricted to surface N. A Rayleigh distillation model accurately described decomposition patterns in the noninvaded commun...Continue Reading

References

Nov 8, 2003·Science·Michelle A WalvoordRobert G Striegl
Sep 1, 1994·Oecologia·R D Evans, J R Ehleringer

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Citations

Apr 14, 2010·Oecologia·Laura G PerryEdward F Redente
Jul 14, 2009·Proceedings of the National Academy of Sciences of the United States of America·Ramesh Laungani, Johannes M H Knops
Mar 28, 2008·Proceedings. Biological Sciences·Alejandro G Farji-Brener, Luciana Ghermandi
Mar 28, 2009·Ecological Applications : a Publication of the Ecological Society of America·Emily C Farrer, Deborah E Goldberg
Sep 23, 2009·Ecological Applications : a Publication of the Ecological Society of America·N A Rossiter-RachorS Schmidt
Mar 10, 2010·Journal of Evolutionary Biology·L A DonovanF Ludwig
Nov 18, 2015·PloS One·Valeria L Martin-AlbarracinMartin A Nuñez
Apr 1, 2008·American Journal of Botany·Philippe M FortuneMalika L Ainouche
May 15, 2007·Ecological Applications : a Publication of the Ecological Society of America·W Matthew Vander Haegen
Nov 24, 2019·Ecological Applications : a Publication of the Ecological Society of America·Sara SoutherThomas Sisk
Apr 16, 2019·Frontiers in Veterinary Science·Dean E Biggins, David A Eads
Jan 21, 2015·Journal of Environmental Quality·Reg F NewmanBrian M Wallace
Apr 21, 2021·Environmental Monitoring and Assessment·Priyanka Srivastava, A S Raghubanshi

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