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- Title
Simulated pollutant nitrogen deposition increases P demand and enhances root-surface phosphatase activities of three plant functional types in a calcareous grassland.
- Authors
Phoenix, Gareth K.; Booth, Rosemary E.; Leake, Jonathan R.; Read, David J.; Grime, J. Philip; Lee, John A.
- Abstract
• The effects of 7 yr enhanced nitrogen (N) deposition (3.5–14 g N m−2 yr−1) in combination with phosphorus (P) additions, on growth, shoot N and P content, and root-surface phosphomonoesterase (PME) activities were determined along with mycorrhizal infection rates in seedlings of a sedge ( Carex flacca), grass ( Koeleria macrantha) and forb ( Leontodon hispidus). • Seedlings were grown for 14–28 d in mesh-walled cores inserted into turfs from treated field plots enabling complete root recovery. • After 14 d, root-surface PME activity was typically more than doubled by 3.5 and 14 g N m−2 yr−1, and by 28 d the N treatments consistently gave dose-dependent effects. PME activity was reduced by P additions in the sedge and grass by 55 and 65%, respectively, and correlated with soil and shoot N and P concentrations, again most strongly in the sedge and grass. Mycorrhizal infection was least in the sedge (1%) and greater in the grass (49%) and forb (76%). • Long-term N enrichment of calcareous grassland stimulates root-surface PME in representatives of the three major higher-plant functional types. PME response to P additions was greatest in least mycorrhizal-dependant species with roots more adapted for direct P uptake.
- Subjects
POLLUTANTS; NITROGEN; PHOSPHATASES; CALCAREOUS soils; ESTERASES; GRASSLANDS; PHOSPHORUS; SEEDLINGS; COGON grass; MYCORRHIZAL plants
- Publication
New Phytologist, 2004, Vol 161, Issue 1, p279
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1046/j.1469-8137.2003.00910.x