Penny Johnes
Penny Johnes
Professor of Biogeochemistry
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Zitiert von
Zitiert von
Nutrient imbalances in agricultural development
PM Vitousek, R Naylor, T Crews, MB David, LE Drinkwater, E Holland, ...
Science 324 (5934), 1519-1520, 2009
Evaluation and management of the impact of land use change on the nitrogen and phosphorus load delivered to surface waters: the export coefficient modelling approach
PJ Johnes
Journal of hydrology 183 (3-4), 323-349, 1996
Uncertainties in annual riverine phosphorus load estimation: Impact of load estimation methodology, sampling frequency, baseflow index and catchment population density
PJ Johnes
Journal of Hydrology 332 (1-2), 241-258, 2007
Modelling the impact of land use change on water quality in agricultural catchments
PJ Johnes, AL Heathwaite
Hydrological processes 11 (3), 269-286, 1997
Nitrogen fluxes from the landscape are controlled by net anthropogenic nitrogen inputs and by climate
R Howarth, D Swaney, G Billen, J Garnier, B Hong, C Humborg, P Johnes, ...
Frontiers in Ecology and the Environment 10 (1), 37-43, 2012
Trends in nutrients
AL Heathwaite, PJ Johnes, NE Peters
Hydrological processes 10 (2), 263-293, 1996
The determination of total nitrogen and total phosphorus concentrations in freshwaters from land use, stock headage and population data: testing of a model for use in …
P Johnes, B Moss, G Phillips
Freshwater Biology 36 (2), 451-473, 1996
A comparison of models for estimating the riverine export of nitrogen from large watersheds
RB Alexander, PJ Johnes, EW Boyer, RA Smith
Biogeochemistry 57 (1), 295-339, 2002
Contribution of nitrogen species and phosphorus fractions to stream water quality in agricultural catchments
AL Heathwaite, PJ Johnes
Hydrological processes 10 (7), 971-983, 1996
A procedure for the simultaneous determination of total nitrogen and total phosphorus in freshwater samples using persulphate microwave digestion
PJ Johnes, AL Heathwaite
Water Research 26 (10), 1281-1287, 1992
Using hysteresis analysis of high-resolution water quality monitoring data, including uncertainty, to infer controls on nutrient and sediment transfer in catchments
CEM Lloyd, JE Freer, PJ Johnes, AL Collins
Science of the Total Environment 543, 388-404, 2016
The Phosphorus Indicators Tool: a simple model of diffuse P loss from agricultural land to water
AL Heathwaite, AI Fraser, PJ Johnes, M Hutchins, E Lord, D Butterfield
Soil Use and Management 19 (1), 1-11, 2003
Integrating nitrogen fluxes at the European scale
A Leip, B Achermann, G Billen, A Bleeker, A Bouwman, W de Vries, ...
Cambridge University Press, 2011
Nitrogen as a threat to European water quality
B Grizzetti, F Bouraoui, G Billen, H van Grinsven, AC Cardoso, V Thieu, ...
Cambridge University Press, 2011
Nitrogen processes in aquatic ecosystems
P Durand, L Breuer, PJ Johnes, G Billen, A Butturini, G Pinay, ...
Cambridge University Press, 2011
Nitrate in surface waters
PJ Johnes, TP Burt
John Wiley and Sons Ltd, 1993
Nitrogen flows from European watersheds to coastal marine waters
G Billen, M Silvestre, B Grizzetti, A Leip, J Garnier, M Voss, R Howarth, ...
Cambridge University Press, 2011
Steady state and dynamic modelling of nitrogen in the River Kennet: impacts of land use change since the 1930s
PG Whitehead, PJ Johnes, D Butterfield
Science of the Total Environment 282, 417-434, 2002
Physico-chemical controls on phosphorus cycling in two lowland streams. Part 2–the sediment phase
DJ Evans, PJ Johnes, DS Lawrence
Science of the Total Environment 329 (1-3), 165-182, 2004
The monitoring of ecological quality and the classification of standing waters in temperate regions: a review and proposal based on a worked scheme for British waters
B Moss, P Johnes, G Phillips
Biological Reviews 71 (2), 310-339, 1996
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