Response of phosphomonoesterase activity in the lichen Cladonia portentosa to nitrogen and phosphorus enrichment in a field manipulation experiment

Hogan, E.J.; Minnullina, G.; Sheppard, L.J.; Leith, I.D.; Crittenden, P.D.. 2010 Response of phosphomonoesterase activity in the lichen Cladonia portentosa to nitrogen and phosphorus enrichment in a field manipulation experiment. New Phytologist, 186. 926-933. 10.1111/j.1469-8137.2010.03221.x

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Abstract/Summary

• Effects of nitrogen (N) enrichment on the heathland lichen Cladonia portentosa were quantified to test the hypothesis that modified N : phosphorus (P) relationships observed in this species in N-polluted natural environments are a direct effect of increased N deposition, and to evaluate potential confounding effects of N form and P availability. • Cladonia portentosa was harvested from experimental plots in lichen-rich peatland vegetation (background total N deposition of 8 kg N ha)1 yr)1) treated for 4 yr with additional wet N deposition at 0, 8, 24 and 56 kg N ha)1 yr)1 as either NH4 + or NO3 ), and with or without P added at either 0.6 or 4 kg P ha)1 yr)1. • Nitrogen enrichment increased thallus N concentration, N : P mass ratio and phosphomonoesterase (PME) activity by factors of up to 1.3, 1.4 and 1.7, respectively, effects being independent of N form. Phosphomonoesterase activity was tightly related to thallus N : P ratio with additions of P at 4 kg ha)1 yr)1 depressing PME activity by a factor of 0.4. • Nitrogen enrichment induces P-limitation in C. portentosa with attendant changes in chemical and physiological characteristics that could be used as sensitive biomarkers with which to detect low levels of N pollution.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1111/j.1469-8137.2010.03221.x
Programmes:	CEH Topics & Objectives 2009 - 2012 > Biogeochemistry > BGC Topic 2 - Biogeochemistry and Climate System Processes
UKCEH and CEH Sections/Science Areas:	Billett (to November 2013)
ISSN:	0028-646X
Additional Keywords:	Whim bog, ammonium, Cladonia portentosa, lichens, N : P ratio, nitrate, nitrogen deposition, phosphatase, phosphorus
NORA Subject Terms:	Botany Biology and Microbiology Ecology and Environment
Date made live:	16 Feb 2011 16:24 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/13441

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