期刊
NEW PHYTOLOGIST
卷 186, 期 4, 页码 926-933出版社
WILEY
DOI: 10.1111/j.1469-8137.2010.03221.x
关键词
ammonium; Cladonia portentosa; lichens; N:P ratio; nitrate; nitrogen deposition; phosphatase; phosphorus
资金
- The School of Biology, University of Nottingham
- Russian Government Scholarship
- Natural Environment Research Council [ceh010023] Funding Source: researchfish
P>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.
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