N deposition affects N availability in interstitial water, growth of Sphagnum and invasion of vascular plants in bog vegetation
Article first published online: 24 JAN 2003
Volume 157, Issue 2, pages 339–347, February 2003
How to Cite
Limpens, J., Berendse, F. and Klees, H. (2003), N deposition affects N availability in interstitial water, growth of Sphagnum and invasion of vascular plants in bog vegetation. New Phytologist, 157: 339–347. doi: 10.1046/j.1469-8137.2003.00667.x
- Issue published online: 24 JAN 2003
- Article first published online: 24 JAN 2003
- Received: 28 August 2002 Accepted: 18 October 2002
- global change;
- raised bogs;
- water chemistry
- •We studied the effects of N deposition on shrub–moss competition and the establishment and growth of invasive Betula pubescens and Molinia caerulea in intact bog vegetation removed from a site subject to 40 kg N ha −1 yr −1 .
- •Mesocosms with and without introduced Betula seedlings and Molinia sprouts were kept under a roof and received an equivalent of 0, 40 and 80 kg N ha −1 yr −1 for two growing seasons.
- •N concentration in both interstitial water and Sphagnum decreased when N input ceased and increased when N input was doubled. Molinia biomass was positively related to the inorganic N concentration in the interstitial water. Adding N increased production of Molinia and prolonged survival of Betula seedlings in the first year. Sphagnum height increment showed a hump-shaped relationship with light interception by vascular plants.
- •N deposition encouraged vascular plants to grow by enhancing N availability in the rhizosphere. Water table level and the availability of P were found to be important in explaining species-specific responses to N deposition. The underlying mechanisms and the reversibility of N effects are discussed.