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

1998

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

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)

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)
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

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

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)
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)

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

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)

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)