Ammonium first: natural mosses prefer atmospheric ammonium but vary utilization of dissolved organic nitrogen depending on habitat and nitrogen deposition
Article first published online: 21 MAY 2013
© 2013 The Authors. New Phytologist © 2013 New Phytologist Trust
Volume 199, Issue 2, pages 407–419, July 2013
How to Cite
Liu, X.-Y., Koba, K., Makabe, A., Li, X.-D., Yoh, M. and Liu, C.-Q. (2013), Ammonium first: natural mosses prefer atmospheric ammonium but vary utilization of dissolved organic nitrogen depending on habitat and nitrogen deposition. New Phytologist, 199: 407–419. doi: 10.1111/nph.12284
- Issue published online: 19 JUN 2013
- Article first published online: 21 MAY 2013
- Manuscript Accepted: 18 MAR 2013
- Manuscript Received: 24 JAN 2013
- Sumitomo Foundation
- Creative Scientific Research. Grant Number: No. 21310008
- National Natural Science Foundation of China. Grant Numbers: Nos 40903012, 41021062, and 41273026
- JSPS. Grant Number: 09F09316
- atmospheric nitrogen deposition;
- dissolved organic nitrogen;
- nitrogen preference;
- soil nitrogen availability;
- stable nitrogen isotope
- Mosses, among all types of terrestrial vegetation, are excellent scavengers of anthropogenic nitrogen (N), but their utilization of dissolved organic N (DON) and their reliance on atmospheric N remain uncharacterized in natural environments, which obscures their roles in N cycles.
- Natural 15N abundance of N sources (nitrate (), ammonium () and DON in deposition and soil) for epilithic and terricolous mosses was analyzed at sites with different N depositions at Guiyang, China. Moss assimilation was inhibited substantially by the high supply of and DON. Therefore, contributions of and DON to moss N were partitioned using isotopic mass-balance methods.
- The N contributions averaged 56% and 46% from atmospheric , and 44% and 17% from atmospheric DON in epilithic and terricolous mosses, respectively. In terricolous mosses, soil and soil DON accounted for 16% and 21% of bulk N, which are higher than current estimations obtained using 15N-labeling methods. Moreover, anthropogenic deposition suppressed utilization of DON and soil N because of the preference of moss for under elevated deposition.
- These results underscore the dominance of, and preference for, atmospheric in moss N utilization, and highlight the importance of considering DON and soil N sources when estimating moss N sequestration and the impacts of N deposition on mosses.