Record ID No. |
344 |
Author(s) |
Phoenix G.K. , Booth R.E. , Leake J.R. , Read D.J. , Grime J.P. , Lee J. A. , 2003 |
Affiliation |
University of Sheffield, Department of Animal and Plant Science, Western Bank, Sheffield S10 2TN, S Yorkshire, England |
Title |
Simulated pollutant nitrogen deposition increases P demand and enhances root-surface phosphataseactivities of three plant functional types in a calcareous grassland |
Source. Vol.(no):Page |
New Phytologist. 161(1), 279-289p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Biochemistry Soil plant relations |
Sub-subjects |
Nitrogen metabolism Nutrition |
Host |
Sedge, Carexflacca, Grass, Koeleria macrantha, Forb, Leontodonhispidus |
Organism |
n.a. |
Country |
United Kingdom., Europe |
Abstracts |
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. |