Title: Effects of water and nitrogen availability on nitrogen contribution by the legume, Lupinus argenteus Pursh
Author: Goergen, Erin; Chambers, Jeanne C.; Blank, Robert;
Source: Applied Soil Ecology. 42(3): 200-208.
Publication Series: Miscellaneous Publication
Description: Nitrogen-fixing species contribute to ecosystem nitrogen budgets, but background resource levels influence nodulation, fixation, and plant growth. We conducted a greenhouse experiment to examine the separate and interacting effects of water and N availability on biomass production, tissue N concentration, nodulation, nodule activity, and rhizodeposition of Lupinus argenteus (Pursh), a legume native to sagebrush steppe. Plants were grown in a replicated, randomized design with three levels of water and four levels of N. Additional water and N increased biomass except at the highest N level. All plants formed nodules regardless of treatment, but plants grown without N had the largest, most active nodules. Organic N was deposited into the rhizosphere of all plants, regardless of treatment, indicating that Lupinus can influence N availability while actively growing, even under water stress. High tissue N concentrations and low C:N ratios indicate that Lupinus also can provide substantial amounts of N through litter decomposition. The ability of Lupinus to affect N availability and cycling indicates that it has the potential to significantly influence N budgets and community composition within the sagebrush steppe.
Keywords: rhizodeposition, symbiotic nitrogen fixation, silver lupine, sagebrush steppe
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication. (Please specify exactly which publication you are requesting and your mailing address.)
XML: View XML
Goergen, Erin; Chambers, Jeanne C.; Blank, Robert. 2009. Effects of water and nitrogen availability on nitrogen contribution by the legume, Lupinus argenteus Pursh. Applied Soil Ecology. 42(3): 200-208.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility