, Volume 7, Issue 8, pp 793–804

How Phosphorus Availability Affects the Impact of Nitrogen Deposition on Sphagnum and Vascular Plants in Bogs


DOI: 10.1007/s10021-004-0274-9

Cite this article as:
Limpens, J., Berendse, F. & Klees, H. Ecosystems (2004) 7: 793. doi:10.1007/s10021-004-0274-9


To elucidate the impact of high nitrogen (N) deposition on intact bog vegetation, as affected by phosphorus (P) availability, we conducted a 4-year fertilization experiment with N and P at six sites, one with moderate N deposition and five with high N deposition. During the growing season, N (40 kg ha−1 ya−1), P (3 kg ha−1 y−1), or a combination of both elements was applied to the vegetation. The fertilization effects turned out to be additive in nature. Adding P decreased the inorganic N concentration and increased the P concentration in the rhizosphere at two sites. Furthermore, P stimulated Sphagnum growth and Sphagnum net primary productivity (NPP) at two sites; it also seemed to encourage growth at two other sites including the moderate-deposition site. Vascular plant growth remained largely unaffected but was depressed at one high-deposition site. Adding N increased the concentration of inorganic N in the rhizosphere at the moderate-deposition site and at two of the three high-deposition sites; vascular plant growth and litter production were encouraged at three high-deposition sites. The addition of N depressed Sphagnum height increment at four high deposition sites and reduced Sphagnum NPP at two sites. Shading by vascular plants was of minor importance in explaining the negative effects of N on Sphagnum. We conclude that because P alleviates the negative impact N has on Sphagnum by enhancing its capability to assimilate the deposited N, P availability is a major factor determining the impact of N deposition on Sphagnum production and thus on carbon sequestration in bogs.


bryophytescompetitiondepositionnutrient limitationnitrogenphosphorusraised bogsshrub–moss competition; Sphagnum

Copyright information

© Springer Science+Business Media, Inc. 2004

Authors and Affiliations

  1. 1.Nature Conservation and Plant Ecology GroupWageningen UniversityWageningenThe Netherlands