caa a22 4500 605517541 CHVBK 20210128100720.0 cr unu---uuuuu 210128e20150801xx s 000 0 eng 10.1007/s10533-015-0117-0 doi (NATIONALLICENCE)springer-10.1007/s10533-015-0117-0 Dependence of ombrotrophic peat nitrogen on phosphorus and climate [Elektronische Daten] [Hannah Toberman, Edward Tipping, John Boyle, Rachel Helliwell, Allan Lilly, Peter Henrys] Nitrogen (N) is a key, possibly limiting, nutrient in ombrotrophic peat ecosystems, and enrichment by pollutant N in atmospheric deposition (Ndep, gm−2a−1) is of concern with regard to peatland damage. We collated data on the N content of surface (depth ≤25cm, mean 15cm) ombrotrophic peat (Nsp) for 215 sites in the UK and 62 other sites around the world, including boreal, temperate and tropical locations (wider global data), and found Nsp to range from 0.5 to 4%. We examined the dependences of Nsp on surface peat phosphorus (P) content (Psp), mean annual precipitation (MAP), mean annual temperature (MAT) and Ndep. Linear regression on individual independent variables showed highly significant (p<0.001) correlations of Nsp with Psp(r2=0.23) and MAP (r2=0.14), and significant (p<0.01) but weaker correlations with MAT (r2=0.03) and Ndep (r2=0.03). A multiple regression model using log-transformed values explained 36% of the variance of the UK data, 84% of the variance of the wider global data, and 47% of the variance of the combined data, all with high significance (p<0.001). In all three cases, most of the variance was explained by Psp and MAP, but in view of a positive correlation between MAP and MAT for many of the sites, a role for MAT in controlling Nsp cannot be ruled out. There is little evidence for an effect of Ndep on Nsp. The results point to a key role of P in N fixation, and thereby C fixation, in ombrotrophic peats. Springer International Publishing Switzerland, 2015 Peat nationallicence Ombrotrophic nationallicence Nitrogen nationallicence Phosphorus nationallicence Climate nationallicence Nitrogen deposition nationallicence Toberman Hannah School of Environmental Sciences, University of Liverpool, L69 3GP, Liverpool, UK aut Tipping Edward Centre for Ecology and Hydrology, Lancaster Environment Centre, LA1 4AP, Lancaster, UK aut Boyle John School of Environmental Sciences, University of Liverpool, L69 3GP, Liverpool, UK aut Helliwell Rachel The James Hutton Institute, Craigiebuckler, AB15 8QH, Aberdeen, Scotland, UK aut Lilly Allan The James Hutton Institute, Craigiebuckler, AB15 8QH, Aberdeen, Scotland, UK aut Henrys Peter Centre for Ecology and Hydrology, Lancaster Environment Centre, LA1 4AP, Lancaster, UK aut Biogeochemistry Springer International Publishing 125/1(2015-08-01), 11-20 0168-2563 125:1<11 2015 125 10533 https://doi.org/10.1007/s10533-015-0117-0 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 review-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10533-015-0117-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Toberman Hannah School of Environmental Sciences, University of Liverpool, L69 3GP, Liverpool, UK aut NATIONALLICENCE 700 1- Tipping Edward Centre for Ecology and Hydrology, Lancaster Environment Centre, LA1 4AP, Lancaster, UK aut NATIONALLICENCE 700 1- Boyle John School of Environmental Sciences, University of Liverpool, L69 3GP, Liverpool, UK aut NATIONALLICENCE 700 1- Helliwell Rachel The James Hutton Institute, Craigiebuckler, AB15 8QH, Aberdeen, Scotland, UK aut NATIONALLICENCE 700 1- Lilly Allan The James Hutton Institute, Craigiebuckler, AB15 8QH, Aberdeen, Scotland, UK aut NATIONALLICENCE 700 1- Henrys Peter Centre for Ecology and Hydrology, Lancaster Environment Centre, LA1 4AP, Lancaster, UK aut NATIONALLICENCE 773 0- Biogeochemistry Springer International Publishing 125/1(2015-08-01), 11-20 0168-2563 125:1<11 2015 125 10533