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Effects of nitrogen enrichment on phosphatase activity and nitrogen: phosphorus relationships in Cladonia portentosa

Hogan, E.J.; Minnullina, G.; Smith, R.I.; Crittenden, P.D.. 2010 Effects of nitrogen enrichment on phosphatase activity and nitrogen: phosphorus relationships in Cladonia portentosa. New Phytologist, 186 (4). 911-925. 10.1111/j.1469-8137.2010.03222.x

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Abstract/Summary

• Relationships between nitrogen deposition in the UK and phosphomonoesterase (PME) activity and nitrogen (N) and phosphorus (P) concentrations in Cladonia portentosa were quantified to understand factors limiting lichen growth and to further develop biomarkers for N pollution. • Lichen was collected from sites differing either in rates of wet N (NH4+ + NO3-) deposition or in annual mean N concentration in rainfall based on both measured and modelled data sets. The PME activity, and total N and P concentrations were measured in specific horizontal strata in lichen mats and PME activity in the thallus was located using an enzyme-labelled fluorescent phosphatase substrate. • With an increase in modelled N deposition from 4.1 to 32.8 kg N ha-1 yr-1, PME activity, thallus N and N : P ratio increased by factors of 2.3, 1.4 and 1.8, respectively. Correlations with modelled data were generally stronger than with measured data and those with N deposition were stronger than those with N concentration in rainfall. The PME activity was located solely in the lichen fungus in outer regions of the thallus. • Nitrogen enrichment changes lichen N : P ratios from values typical of N limitation (for example, 10) to those indicative of P limitation (for example, 26) driving upregulation of PME activity.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/j.1469-8137.2010.03222.x
Programmes: CEH Topics & Objectives 2009 onwards > Biogeochemistry > BGC Topic 1 - Monitoring and Interpretation of Biogeochemical and Climate Changes > BGC - 1.1 - Monitor concentrations, fluxes, physico-chemical forms of current and emerging pollutants ...
CEH Sections: Billett
ISSN: 0028-646X
Additional Information. Not used in RCUK Gateway to Research.: Open access paper. Follow Official URL to access full-text
Additional Keywords: Cladonia portentosa, lichens, N : P ratio, nitrogen deposition, phosphatase, phosphorus
NORA Subject Terms: Atmospheric Sciences
Date made live: 07 Mar 2011 13:58
URI: http://nora.nerc.ac.uk/id/eprint/13699

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