Professor Penny J Johnes

BSc, D.Phil (Oxon.)

  • BS8 1SS

    United Kingdom

  • BS8 1SS

1989 …2020

Research output per year

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Research Output

1989

The Natural History of Slapton Ley Nature Reserve XVIII: nitrogen and phosphorus losses from the catchment - an export coefficient modelling approach

Johnes, P. J. & O'Sullivan, P. E., 1989, In : Field Studies. 7, p. 287-309 23 p.

Research output: Contribution to journalArticle (Academic Journal)

1990

Hydrological processes in the Slapton catchments and their relationship to sediment and solutes losses

Burt, T. P., Johnes, P. J., Heathwaite, A., Trudgill, S. T., O'Sullivan, P. E. & Chell, K., 1990, In : Proceedings of the Hydrological Research Basins & Environment Conference. TNO 44, p. 295-302

Research output: Contribution to journalArticle (Academic Journal)

1991

Water quality trends in the Windrush catchment: Nitrogen speciation and sediment interactions

Johnes, P. J. & Burt, T. P., Aug 1991, Sediment and Stream Water Quality in a Changing Environment: Trends and Explanation. IAHS Press, Vol. 209. p. 349-357 9 p.

Research output: Chapter in Book/Report/Conference proceedingChapter in a book

1992

A procedure for the simultaneous determination of total nitrogen and total phosphorus in freshwater samples using persulphate microwave digestion

Johnes, P. & Heathwaite, A. L., 1992, In : Water Research. 26, 10, p. 1281-1287 7 p.

Research output: Contribution to journalArticle (Academic Journal)

112 Citations (Scopus)

Modelling the impact on water quality of land use change in the Windrush catchment

Johnes, P. J. & Burt, T., 1992, Land use change: causes and consequences: ITE Symposium no. 27. Whitby, M. (ed.). London: HMSO, p. 195-196

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

1993

A procedure for the digestion of natural water samples for determination of total N and total P concentrations in freshwaters

Johnes, P. J. & Heathwaite, A., 1993, Chemical analysis of natural waters in environmental research : a collection of papers presented at an International Conference on Chemical Analysis of Natural Waters in Environmental Research: analytical solutions of current problems, held at the Institute Terrestrial Ecology, Merlewood Research Station, Grange-over-Sands, Cumbria, UK, September 1991: Science of the Total Environment. Cape, J., Hilton, J., Kennedy, V. H. & Rowland, A. (eds.). 1-3 ed. Vol. 135.

Research output: Chapter in Book/Report/Conference proceedingChapter in a book

Nitrate in surface waters

Johnes, P. J. & Burt, T. P., 1993, Nitrate: processes, patterns and controls. Burt, T. P., Heathwaite, A. L. & Trudgill, S. T. (eds.). John Wiley & Sons, Ltd., p. 269-317

Research output: Chapter in Book/Report/Conference proceedingChapter in a book

12 Citations (Scopus)
1994

Auguste Thienemann and Loch Lomond - an approach to the design of a system for monitoring the state of north-temperate standing waters.

Moss, B., Johnes, P. J. & Phillips, G., 1994, Developments in Hydrobiology, 101, p. 1-12.

Research output: Contribution to specialist publicationArticle (Specialist Publication)

August Thienemann and Loch Lomond - an approach to the design of a system for monitoring the state of north-temperate standing waters

Moss, B., Johnes, P. & Phillips, G., 1994, In : Hydrobiologia. 290, p. 1-12 12 p.

Research output: Contribution to journalArticle (Academic Journal)

7 Citations (Scopus)

Lakes-Classification and Monitoring: a strategy for the classification of lakes: R&D Note 253

Johnes, P. J., Moss, B. & Phillips, G. L., 1994, National Rivers Authority R&D Note 253. Bristol: National Rivers Authority

Research output: Chapter in Book/Report/Conference proceedingOther chapter contribution

Lakes - Classification and Monitoring. NRA R&D Project Record 286/6/A

Johnes, P. J., Moss, B. & Phillips, G. L., 1994, Bristol: Environment Agency.

Research output: Book/ReportCommissioned report

1995

Ecology and management of wetlands

Hughes, J. M. R. & Johnes, P. J., 1995, The Hydrology and Hydrochemistry of British Wetlands. Hughes, J. M. R. & Heathwaite, A. L. (eds.). John Wiley & Sons, Ltd., p. 317-323

Research output: Chapter in Book/Report/Conference proceedingChapter in a book

1996

Contribution of N Species and P Fractions to Stream Water Quality in Agricultural Catchments

Heathwaite, A. L. & Johnes, P., 1996, In : Hydrological Processes. 10, 7, p. 971-983 13 p.

Research output: Contribution to journalArticle (Academic Journal)

Stream water quality and nutrient export in the Slapton Catchments

Burt, T. P., Heathwaite, A. L. & Johnes, P. J., 1996, In : Field Studies. 8, p. 613-627 15 p.

Research output: Contribution to journalArticle (Academic Journal)

14 Citations (Scopus)

The Limnology of Slapton Ley

Johnes, P. & Wilson, H. M., 1996, In : Field Studies. 8, p. 585-612 28 p.

Research output: Contribution to journalArticle (Academic Journal)

9 Citations (Scopus)

The monitoring and classification of standing waters in temperate regions - a discussion and proposal based on a worked scheme for British waters

Moss, B., Johnes, P. J. & Phillips, G. L., 1996, In : Biological Reviews. 71, 2, p. 310-339

Research output: Contribution to journalArticle (Academic Journal)

Trends in nutrients

Heathwaite, A. L., Johnes, P. & Peters, N. E., 1996, In : Hydrological Processes. 10, 2, p. 263-293 31 p.

Research output: Contribution to journalArticle (Academic Journal)

133 Citations (Scopus)
1997

Improving lake water quality in Slapton Ley National Nature Reserve, S. Devon, UK - amelioration by wetlands or catchment source management

Trudgill, S. T., Burt, T. P., Johnes, P. J. & Heathwaite, A. L., 1997, In : International Association of Hydrological Sciences Publications. 243, p. 299-312

Research output: Contribution to journalArticle (Academic Journal)

Managing Water Quality in Agricultural Catchments

Burt, T. P. & Johnes, P. J., 1997, In : Transactions of the Institute of British Geographers. 22, p. 61-68 8 p.

Research output: Contribution to journalArticle (Academic Journal)

25 Citations (Scopus)

Modelling the impact of land use change on water quality in agricultural catchments

Johnes, P. & Heathwaite, A. L., 1997, In : Hydrological Processes. 11, 3, p. 269-286 18 p.

Research output: Contribution to journalArticle (Academic Journal)

New approaches to the monitoring and classifying of standing waters

Moss, B., Johnes, P. J. & Phillips, G. L., 1997, Freshwater Quality: defining the indefinable. Boon, P. J. & Howell, D. J. (eds.). Edinburgh: HMSO, p. 118-133

Research output: Chapter in Book/Report/Conference proceedingChapter in a book

Nitrogen Speciation Dynamics in Two Contrasting Riparian Ecosystems

Prior, H., Johnes, P. J., Gibson, M. & Hughes, J. M. R., 1997, Biogeomon '97: Journal of Conference Abstracts. Cambridge University Press, p. 273

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Nutrient Speciation Dynamics in UK Rivers: Seasonality and Flow Controls

Johnes, P. J., 1997, Biogeomon '97: Journal of Conference Abstracts. 2 ed. Cambridge University Press, Vol. 2. p. 206

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

1998

Phosphorus loss from agricultural catchments: pathways and implications for management

Johnes, P. J. & Hodgkinson, R., 1998, In : Soil Use and Management. 14, p. 175-185

Research output: Contribution to journalArticle (Academic Journal)

44 Citations (Scopus)

Trial Classification of Lake Water Quality in England and Wales: R&D Technical Report E54

Johnes, P. J., Butterfield, D., Whitehead, P., Moss, B., Bennion, H. B., Curtis, C. & Patrick, S., 1998, Environment Agency.

Research output: Book/ReportCommissioned report

Trial Classification of Lake Water Quality in England and Wales: a proposed approach: R&D Technical Report 253

Johnes, P. J., Bennion, H., Curtis, C., Moss, B., Whitehead, P. & Patrick, S., 1998, Bristol: Environment Agency.

Research output: Book/ReportCommissioned report

1999

Understanding lake and catchment history as a tool for integrated lake management

Johnes, P., 1999, In : Hydrobiologia. 395/396, p. 41-60 20 p.

Research output: Contribution to journalArticle (Academic Journal)

27 Citations (Scopus)
2000

Assessing nutrient inputs and their impact in catchments, UK

Phillips, G. L. & Johnes, P. J., 2000, Implementing the Water Framework Directive: A seminar series on water. Jones, T. (ed.). Brussels: World Wide Fund for Nature, p. 39-44

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Quantification of National P Loss from Agriculture to Water.

Johnes, P., Fraser, A., Harrod, T., Butterfield, D. & Withers, P., 2000, In : Environment News. 1, 1, p. 2-3 2 p.

Research output: Contribution to journalArticle (Academic Journal)

Understanding lake and catchment history as a tool for integrated lake management

Johnes, P. J., 2000, The Ecological Bases for Lake and Reservoir Management: Developments in Hydrobiology. Harper, D. M., Brierley, W., Ferguson, A. J. D. & Phillips, G. L. (eds.). Kluwer Academic Publishers, Vol. 136. p. 41-60

Research output: Chapter in Book/Report/Conference proceedingChapter in a book

2002

A comparison of methods for estimating the riverine export of nitrogen from large watersheds

Alexander, R. B., Johnes, P. J., Boyer, E. W. & Smith, R. A., 2002, The Nitrogen Cycle at Regional to Global Scales. Boyer, E. W. & Howarth, R. W. (eds.). Springer, Dordrecht, p. 295-339

Research output: Chapter in Book/Report/Conference proceedingChapter in a book

A comparison of models for estimating the riverine export of nitrogen from large watersheds

Alexander, R. B., Johnes, P. J., Boyer, E. W. & Smith, R. A., 2002, In : Biogeochemistry. 57/58, 1, p. 295-339 45 p.

Research output: Contribution to journalArticle (Academic Journal)

136 Citations (Scopus)

Landscape, regional and global estimates of N flux from land to ocean: errors and uncertainties

Johnes, P. J. & Butterfield, D., 2002, The Nitrogen Cycle at Regional to Global Scales. Boyer, E. W. & Howarth, R. W. (eds.). Springer, Dordrecht, p. 429-476

Research output: Chapter in Book/Report/Conference proceedingChapter in a book

Landscape, regional and global estimates of nitrogen flux from land to sea: errors and uncertainties

Johnes, P. J. & Butterfield, D., 2002, In : Biogeochemistry. 57-58, 1, p. 429-476 48 p.

Research output: Contribution to journalArticle (Academic Journal)

38 Citations (Scopus)

Phosphorus and Sediment Yield Characterization In Catchments (psychic)

Withers, P. J., Quinton, J., Heathwaite, A., Johnes, P. J., Walling, D. E. & Jarvie, H., 2002, Geophysical Research Abstracts. Copernicus GmbH, p. 1287

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

51 Citations (Scopus)

Steady state and dynamic modelling of nitrogen in the River Kennet: impacts of land use change since the 1930s

Whitehead, P. G., Johnes, P. J. & Butterfield, D., 2002, In : Science of The Total Environment. 282-283, p. 417-434 18 p.

Research output: Contribution to journalArticle (Academic Journal)

69 Citations (Scopus)

The prediction of nutrients into estuaries and their subsequent behaviour: application to the Tamar and comparison with the Tweed, U.K.

Uncles, R. J., Fraser, A. I., Butterfield, D., Johnes, P. & Harrod, T. R., 2002, In : Hydrobiologia. 475-476, 1, p. 239-250 12 p.

Research output: Contribution to journalArticle (Academic Journal)

15 Citations (Scopus)
2003

Effectiveness of eutrophication control by phosphorus reduction

Johnes, P. J., Whitehead, P., Davis, S., Wade, A. & Butterfield, D., 2003, Bristol: Environment Agency, (R D Technical Report).

Research output: Working paperWorking paper and Preprints

Fal and Helford Special Areas of Conservation (cSAC) and the Tamar Estuaries complex cSAC/Special Protection Area (pSPA): estimation of diffuse and point-source nutrient inputs

Fraser, A., Butterfield, D., Uncles, R., Johnes, P. J. & Harrod, T. R., 2003, Site Characterisation of the South West European Marine Sites: Fal and Helford cSAC. Langston, W. J., Chesman, B. S., Burt, G. R., Hawkins, S. J., Readman, J. & Worsfold, P. (eds.). Plymouth, Devon, UK: Marine Biological Association of the United Kingdom, Vol. Occasional Publication 8. 160 p. (Occasional Publication of the Marine Biological Association).

Research output: Chapter in Book/Report/Conference proceedingChapter in a book

Land use for achieving ‘good ecological status’ of waterbodies in England and Wales: a theoretical exploration for nitrogen and phosphorus

Haygarth, P. M., Johnes, P. J., Butterfield, D., Foy, R. & Withers, P. J., 2003, HMSO. 30 p.

Research output: Book/ReportCommissioned report

Suspended and bed load sediment transport dynamics in two lowland UK streams--storm integrated monitoring

Evans, D., Johnes, P. & Lawrence, D., 2003, In : International Association of Hydrological Sciences Publications. 283, p. 103-110 8 p.

Research output: Contribution to journalArticle (Academic Journal)

9 Citations (Scopus)

The Phosphorus Indicators Tool: a simple model of diffuse P loss from agricultural land to water

Heathwaite, A. L., Fraser, A. I., Johnes, P. J., Hutchins, M., Lord, E. & Butterfield, D., 2003, In : Soil Use and Management. 19, 1, p. 1-11 11 p.

Research output: Contribution to journalArticle (Academic Journal)

100 Citations (Scopus)
2004

Nutrient monitoring, simulation and management within a major lowland UK river system: the Kennet

Wade, A. J., Whitehead, P., Jarvie, H. P., Neal, C., Prior, H. & Johnes, P. J., 2004, In : Mathematics and Computers in Simulation. 64, 3-4, p. 307-317 11 p.

Research output: Contribution to journalArticle (Academic Journal)

16 Citations (Scopus)

Physico-chemical controls on phosphorus cycling in two lowland streams. Part 1 - the water column

Evans, D. J. & Johnes, P., 2004, In : Science of The Total Environment. 329, 1-3, p. 145-163 19 p.

Research output: Contribution to journalArticle (Academic Journal)

49 Citations (Scopus)

Physico-chemical controls on phosphorus cycling in two lowland streams. Part 2 - The sediment phase

Evans, D. J., Johnes, P. J. & Lawrence, D. S., 2004, In : Science of The Total Environment. 329, 1-3, p. 165-182 18 p.

Research output: Contribution to journalArticle (Academic Journal)

79 Citations (Scopus)