Porth Ymchwil

Professor Davey Jones

Professor of Soil and Environmental Science / Associate Pro Vice-Chancellor

Aelodaeth

Dolenni cyswllt

Lawrlwytho CV
ORCID: 0000-0002-1482-4209

Contact info

Address: Environment Centre Wales, Bangor University, Bangor, Gwynedd, LL57 2UW

Email:  d.jones@bangor.ac.uk

Tel: 07827 807516 (UK) and 00 44 1248 382579 (International)

WeChat ID: wxid_iqg8l4vzh5nl12

Researchgate profile; Google scholar profile; Twitter feed; Web of Science ResearcherID: C-7411-2011

651 - 700 o blith 707Maint y tudalen: 50
Trefnu yn ôl: Math
  1. Pennod › Ymchwil › Heb ei adolygu gan gymheiriaid
  2. Cyhoeddwyd

    Matching supply with demand.

    Murphy, D. V., Stockdale, E. A., Hoyle, F. C., Smith, J. U., Fillery, I. R., Milton, N., Cookson, W. R., Brussaard, L., Jones, D. L., Hatch, D. J. (Golygydd), Chadwick, D. R., Jarvis, S. C. & Roker, J. A. (Golygydd), 1 Ion 2004, Controlling nitrogen flows and losses. 2004 gol. Wageningen Academic Publishers, t. 101-112

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

  3. Cyhoeddwyd

    Missing N: is the solution in dissolved N?

    Macdonald, A. J., Jones, D. L., Hatch, D. J. (Golygydd), Chadwick, D. R., Jarvis, S. C. (Golygydd) & Roker, J. A. (Golygydd), 1 Ion 2004, Controlling nitrogen flows and losses. 2004 gol. Wageningen Academic Publishers, t. 600-605

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

  4. Cyhoeddwyd

    Organic acid root-tip tissue concentration in Brachiaria decumbens and Brachiaria ruziziensis

    Grundy, S. P., Jones, D. L., Godbold, D. L., Horst, W. W. (Golygydd), Sattelmacher, B. (Golygydd), Schmidhalter, U. (Golygydd), Schubert, S. (Golygydd), Von Wiren, N. (Golygydd), Wittenmayer, L. (Golygydd), Schenk, M. K. (Golygydd), Burkert, A. (Golygydd), Claassen, N. (Golygydd) & Flessa, H. (Golygydd), 1 Ion 2001, Plant nutrition - food security and sustainability of agro-ecosystems through applied and basic research.. 2001 gol. Kluwer Academic Publishers, t. 506-507

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

  5. Cyhoeddwyd

    Pathogen survival patterns in waste-derived composts destined for land restoration

    Williamson, J. C., Holmberg, J., Nason, M. A., Tandy, S., Jones, R., Healey, J. R., Jones, D. L., Vegh, B. (Golygydd) & Royle, J. (Golygydd), 1 Ion 2006, Proceedings of Waste 2006: sustainable waste and resource management, Stratford-upon-Avon, Warwickshire. 2006 gol. The Waste Conference Limited, t. 733-738

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

  6. Cyhoeddwyd

    Physical and chemical characteristics of composted wastes can be altered to make them suitable for large scale habitat creation

    Nason, M. A., Tandy, S., Williamson, J. C., Farrell, M., Healey, J. R., Jones, D. L., Vegh, B. (Golygydd) & Royle, J. (Golygydd), 1 Ion 2006, Proceedings of Waste 2006: sustainable waste and resource management, Stratford-upon-Avon, Warwickshire. 2006 gol. The Waste Conference Limited, t. 739-744

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

  7. Cyhoeddwyd

    Plants and the environment: land reclamation and remediation: Principles and practice

    Jones, D. L., Rowe, E. C., Thomas, B. (Golygydd), Murphy, D. (Golygydd) & Murray, B. (Golygydd), 1 Ion 2003, Encyclopaedia of applied plant science. 2003 gol. Academic Press, t. 741-748

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

  8. Cyhoeddwyd

    Recycling of wood ash to forests in North Wales, UK.

    Walmsley, J. D., Healey, J. R. & Jones, D. L., 1 Ion 2006, Proceedings of Second World Bioenergy Conference, 30 May-1 June 2006, Jönköping, Sweden. 2006 gol. Swedish Bioenergy Association, t. 347-351

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

  9. Cyhoeddwyd

    Rhizosphere methods in agroforestry research.

    Jones, D. L., Schroth, G. (Golygydd) & Sinclair, F., 1 Ion 2003, Trees: crops and soil fertility: concepts and research methods. 2003 gol. CAB International, t. 289-301

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

  10. Cyhoeddwyd

    Soil functioning in natural and planted woodlands on slate waste

    Williamson, J. C., Jones, D. L., Rowe, E. C., Healey, J. R., Bardgett, R., Hobbs, P., Moore, H. M. (Golygydd), Fox, H. R. (Golygydd) & Elliott, S. (Golygydd), 1 Ion 2003, Land Reclamation: Extending the Boundaries. 2003 gol. Taylor & Francis, t. 315-318

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

  11. Cyhoeddwyd

    Soil functioning in natural and planted woodlands on slate waste

    Williamson, J. C., Jones, D. L., Rowe, E. C., Healey, J. R., Bardgett, R., Hobbs, P., Moore, H. M. (Golygydd), Fox, H. R. (Golygydd) & Elliott, S. (Golygydd), 1 Ion 2003, Land reclamation. 2003 gol. Swets & Zeitlinger, t. 315-318

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

  12. Cyhoeddwyd

    The control of carbon acquisition by and growth of roots.

    Farrar, J. F., Jones, D. L., De Kroon, H. (Golygydd) & Visser, E. J. (Golygydd), 1 Ion 2003, Root Ecology. 2003 gol. Springer-Verlag Berlin and Heidelberg GmbH, t. 91-124

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

  13. Cyhoeddwyd

    Waste water treatment.

    Jones, D. L., Freeman, C., Thomas, B. (Golygydd), Murphy, D. (Golygydd) & Murray, B. (Golygydd), 1 Ion 2003, Encyclopaedia of applied plant science. 2003 gol. Academic Press, t. 772-781

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

  14. Pennod › Ymchwil › Adolygwyd gan gymheiriaid
  15. Cyhoeddwyd

    Can In-Situ Soil Nitrate Measurements Improve Nitrogen-Use Efficiency in Agricultural Systems?

    Jones, D. L., Chadwick, D. R., Rengaraj, S., Wu, D., Williams, A. P., Hill, P. W., Miller, A. J., Lark, R. M., Rosolem, C. A., Damin, V. & Shaw, R., 1 Rhag 2018, Proceedings 1466-1314. International Fertiliser Society, Cyfrol 825. t. 1-32 32 t. 825

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod › adolygiad gan gymheiriaid

  16. Cyhoeddwyd

    The role of ion transport processes in root hair tip growth in Limnobium stoloniferum

    Kochian, L. V., Shaff, J. E. & Jones, D. L., 1994, Pollen-pistil interactions and pollen tube growth. Cyfrol 12. t. 150-160 (CURRENT TOPICS IN PLANT PHYSIOLOGY : AN AMERICAN SOCIETY OF PLANT PHYSIOLOGISTS SERIES).

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod › adolygiad gan gymheiriaid

  17. Cyhoeddwyd

    Waste Water Treatment

    Jones, D., Freeman, C. & Sánchez-Rodríguez, A. R., 1 Ion 2017, Encyclopedia of Applied Plant Sciences. Thomas, B., Murray, B. G. & Murphy , D. J. (gol.). 2 gol. Elsevier, Cyfrol 3. t. 352 10 t.

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod › adolygiad gan gymheiriaid

  18. Cyfraniad i Gynhadledd › Ymchwil › Heb ei adolygu gan gymheiriaid
  19. Cyhoeddwyd

    Evaluation of spatial contamination patterns for norovirus and faecal indicator bacteria near to a coastal sewage discharge using Mytilus edulis as biosentinels

    Winterbourn, J. B., Clements, K., Malham, S., McDonald, J. & Jones, D. L., Ion 2013, 92 McLeod et al (eds.). Proc. 9th Int. Conf. Molluscan Shellfish Safety . t. 89-92

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Cyfraniad i Gynhadledd

  20. Papur › Ymchwil › Heb ei adolygu gan gymheiriaid
  21. Cyhoeddwyd

    Changes in water holding capacity of fine slate waste during decomposition of added plant litters

    Nason, M., Farrar, J. F., Healey, J. F., Jones, D. L., Williamson, J. C. & Rowe, E. C., 18 Rhag 2001.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Papur

  22. Cyhoeddwyd
  23. Cyhoeddwyd

    Overview of Biomass Energy in Wales, UK

    Walmsley, J. D., Jones, D. L. & Healey, J. R., 1 Medi 2006.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Papur

  24. Cyhoeddwyd

    Pathogen survival patterns in waste-derived composts destined for land restoration

    Williamson, J. C., Holmberg, J., Nason, M. A., Tandy, S., Jones, R., Healey, J. R. & Jones, D. L., 1 Ion 2006, t. 733-738.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Papur

  25. Cyhoeddwyd

    Re-creating a woodland and heathland on slate waste in Wales

    Williamson, J. C., Rowe, E. C., Rendell, T., Healey, J. R., Jones, D. L., Holliman, P. J. & Nason, M. A., 9 Meh 2002, t. 449-458.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Papur

  26. Cyhoeddwyd

    Recycling of Wood Ash to Forests in the UK

    Walmsley, J. D., Jones, D. L. & Healey, J. R., 1 Medi 2006.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Papur

  27. Cyhoeddwyd

    Recycling of Wood Ash to Forests: Application to PAWS Sites

    Pitman, R., Walmsley, J. D., Healey, J. R. & Jones, D. L., 1 Medi 2006.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Papur

  28. Cyhoeddwyd

    Recycling of Wood Ash to Forests: Application to PAWS Sites

    Pitman, R., Walmsley, J. D., Healey, J. R. & Jones, D. A., 1 Medi 2006.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Papur

  29. Cyhoeddwyd

    Recycling of wood ash to forests in North Wales, UK.

    Walmsley, J. D., Healey, J. R. & Jones, D. L., 30 Mai 2006, t. 347-351.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Papur

  30. Cyhoeddwyd

    Soil functioning in natural and restored systems on slate waste.

    Williamson, J. C., Jones, D. L., Bardgett, R. D., Hobbs, P. J., Rowe, E. C., Nason, M. A. & Healey, J. R., 18 Rhag 2001.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Papur

  31. Cyhoeddwyd

    Sustainable post-industrial land restoration and recreation of high biodiversity natural habitats

    Williamson, J. C., Rowe, E. C., Healey, J. R., Jones, D. L., Holliman, P. J. & Nason, M. A., 1 Ion 2002.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Papur

  32. Cyhoeddwyd

    Water and nutrient limitations to tree establishment on slate waste.

    Rowe, E. C., Williamson, J. C., Jones, D. L. & Healey, J. R., 18 Rhag 2001.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Papur

  33. Crynodeb › Ymchwil › Adolygwyd gan gymheiriaid
  34. Cyhoeddwyd

    Extreme drought influences N2O hot moment intensity and duration

    Withers, E., Cardenas, L. M., Jones, D. L. & Chadwick, D., Mai 2023, t. 473-474. 1 t.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Crynodeb › adolygiad gan gymheiriaid

  35. Erthygl › Ymchwil
  36. Cyhoeddwyd

    Testing sewage has helped track COVID – soon it could reveal much more about the UK’s health

    Jones, D. L. & Singer, A. C., 23 Maw 2022, The Conversation.

    Allbwn ymchwil: Cyfraniad at gyhoeddiad arbenigol › Erthygl

  37. Cyfraniad Arall › Ymchwil › Heb ei adolygu gan gymheiriaid
  38. Cyhoeddwyd

    How do draining and re-wetting affect carbon stores and greenhouse gas fluxes in peat soils?

    Bussell, J., Jones, D. L., Healey, J. R. & Pullin, A. S., 25 Medi 2010, The Collaboration for Environmental Evidence.

    Allbwn ymchwil: Cyfraniad arall › Cyfraniad Arall

  39. Llyfr › Ymchwil › Heb ei adolygu gan gymheiriaid
  40. Cyhoeddwyd

    Restoring habitats of high conservation value after quarrying: best practice manual

    Williamson, J. C., Rowe, E. C., Rendell, T., Healey, J. R., Jones, D. L., Holliman, P. J. & Nason, M. A., 1 Ion 2003, University of Wales, Bangor, Institute of Environmental Science.

    Allbwn ymchwil: Llyfr/Adroddiad › Llyfr

  41. Cyhoeddwyd

    Using organic wastes and composts to remediate and restore land: best practice manual

    Nason, M. A., Williamson, J., Tandy, S., Christou, M., Jones, D. L. & Healey, J. R., 1 Ion 2007, Unknown.

    Allbwn ymchwil: Llyfr/Adroddiad › Llyfr

  42. Llyfr › Ymchwil › Adolygwyd gan gymheiriaid
  43. Cyhoeddwyd

    Dissolved Organic Matter in Freshwater Ecosystems: Nature, Origins and Ecological Significance

    Johnes, P. (Golygydd), Evershed, R. P. (Golygydd), Jones, D. L. (Golygydd) & Maberly, S. C. (Golygydd), 2023, Springer.

    Allbwn ymchwil: Llyfr/Adroddiad › Llyfr › adolygiad gan gymheiriaid

  44. Adroddiad Comisiwn › Ymchwil › Heb ei adolygu gan gymheiriaid
  45. Cyhoeddwyd

    Bioreduction of fallen stock – An evaluation of in-vessel bioreduction for containment of sheep prior to disposal: Final report

    Williams, A. P., Edwards-Jones, G. & Jones, D. L., 1 Ion 2008, 2008 gol. Unknown.

    Allbwn ymchwil: Llyfr/Adroddiad › Adroddiad Comisiwn

  46. Cyhoeddwyd

    Defra Lowland Peat 2: Managing agricultural systems on lowland peat for decreased greenhouse gas emissions whilst maintaining agricultural productivity. Report to Defra for Project SP1218

    Evans, C. D., Morrison, R., Cumming, A., Bodo, A., Burden, A., Callaghan, N., Clilverd, H., Cooper, H., Cowan, N., Crabtree, D., D'Acunha, B., Freeman, B., Rhymes, J., Jovani-Sancho, J., Keith, A., McNamara, N., Musarika, S., Rylett, D., Page, S., Kaduk, J., Mills, M., Newman, T., Boum, A., Chadwick, D., Hardaker, A., Gibbons, J., Jones, D. L., Abdel-Aziz, I., Eyre, C., Mullholland, B., Baird, A., Lindsay, R., Clough, J., Hudson, M., Palmer, L. & Burton, R., 1 Maw 2023, Uk Centre for Ecology and Hydrology. 126 t.

    Allbwn ymchwil: Llyfr/Adroddiad › Adroddiad Comisiwn

  47. Cyhoeddwyd

    Science to Policy: Climate-proofing grassland productivity

    Wiik, E., Jones, D. L., Chadwick, D., Hill, P., Sanchez Rodriguez, A., Dodd, R., Turner, R., Kingston-Smith, A., Gwynn-Jones, D., Doonan, J., Scullion, J., Loka, D., Hayes, F., Robinson, D. & Toberman, H., Maw 2019, Ser Cymru National Research Network for Low Carbon, Energy and Environment. (Science to Policy)

    Allbwn ymchwil: Llyfr/Adroddiad › Adroddiad Comisiwn

  48. Adroddiad Comisiwn › Ymchwil › Adolygwyd gan gymheiriaid
  49. Cyhoeddwyd

    Final report on project SP1210: Lowland peatland systems in England and Wales – evaluating greenhouse gas fluxes and carbon balances

    Evans, C., Morrison, R., Burden, A., Williamson, J., Baird, A., Brown, E., Callahan, N., Chapman, P., Cumming, A., Dean, H., Dixon, S., Dooling, G., Evans, J., Gauci, V., Grayson, R., Haddaway, N., He, Y., Heppell, K., Holden, J., Hughes, S., Kaduk, J., Jones, D. L., Matthews, R., Menichino, N., Misselbrook, T., Page, S., Pan, G., Peacock, M., Rayment, M., Ridley, L., Robinson, I., Rylett, D., Scowen, M., Stanley, K. & Worrall, F., 2016, Centre for Ecology & Hydrology .

    Allbwn ymchwil: Llyfr/Adroddiad › Adroddiad Comisiwn › adolygiad gan gymheiriaid

  50. Erthygl adolygu › Ymchwil › Adolygwyd gan gymheiriaid
  51. Cyhoeddwyd

    A plant perspective on nitrogen cycling in the rhizosphere

    Moreau, D., Bardgett, R. D., Finlay, R. D., Jones, D. L. & Philippot, L., Ebr 2019, Yn: Functional Ecology. 33, 4, t. 540-552

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl adolygu › adolygiad gan gymheiriaid

  52. Cyhoeddwyd

    AGRONOMIC AND ENVIRONMENTAL BENEFITS OF REINTRODUCING HERB- AND LEGUME-RICH MULTISPECIES LEYS INTO ARABLE ROTATIONS: A REVIEW

    Cooledge, E. C., Chadwick, D. R., Smith, L. M. J., Leake, J. R. & Jones, D. L., Meh 2022, Yn: Frontiers of Agricultural Science and Engineering. 9, 2, t. 245-271

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl adolygu › adolygiad gan gymheiriaid

  53. Cyhoeddwyd

    Behavior of microplastics and plastic film residues in the soil environment: A critical review

    Qi, R., Jones, D. L., Li, Z., Liu, Q. & Yan, C., 10 Chwef 2020, Yn: Science of the Total Environment. 703, 134722.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl adolygu › adolygiad gan gymheiriaid

  54. Cyhoeddwyd

    Critical review of the impacts of grazing intensity on soil organic carbon storage and other soil quality indicators in extensively managed grasslands

    Abdalla, M., Hastings, A., Chadwick, D. R., Jones, D. L., Evans, C. D., Jones, M. B., Rees, R. M. & Smith, P., 1 Chwef 2018, Yn: Agriculture, Ecosystems and Environment. 253, t. 62-81

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl adolygu › adolygiad gan gymheiriaid

  55. Diurnal Rhythmicity in the Rhizosphere Microbiome-Mechanistic Insights and Significance for Rhizosphere Function

    Bending, G. D., Newman, A., Picot, E., Mushinski, R. M., Jones, D. L. & Carré, I. A., 18 Tach 2024, (E-gyhoeddi cyn argraffu) Yn: Plant, Cell and Environment.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl adolygu › adolygiad gan gymheiriaid

  56. Cyhoeddwyd

    Harnessing the Power of Next-Generation Sequencing in Wastewater-Based Epidemiology and Global Disease Surveillance

    Farkas, K., Williams, R. C., Hillary, L. S., Garcia-Delgado, A., Jameson, E., Kevill, J. L., Wade, M. J., Grimsley, J. M. S. & Jones, D. L., 30 Tach 2024, Yn: Food and Environmental Virology. 17, 1, 5.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl adolygu › adolygiad gan gymheiriaid

  57. Cyhoeddwyd

    How do draining and re-wetting affect carbon stores and greenhouse gas fluxes in peat soils? Systematic Review

    Bussell, J., Jones, D., Healey, J. & Pullin, A., 2010, Yn: Environmental Evidence. SR49.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl adolygu › adolygiad gan gymheiriaid

  58. Cyhoeddwyd

    Impacts of abiotic stresses on the physiology and metabolism of cool-season grasses: A review

    Loka, D., Harper, J., Humphreys, M., Gasior, D., Wootton-Beard, P., Gwynn-Jones, D., Scullion, J., Doonan, J., Kingston-Smith, A., Dodd, R., Wang, J., Chadwick, D., Hill, P., Jones, D., Mills, G., Hayes, F. & Robinson, D., Chwef 2019, Yn: Food and Energy Security. 8, 1, e00152.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl adolygu › adolygiad gan gymheiriaid

  59. Cyhoeddwyd

    Microplastics as an emerging threat to plant and soil health in agroecosystems

    Zhou, J., Wen, Y., Marshall, M. R., Zhao, J., Gui, H., Yang, Y., Zeng, Z., Jones, D. L. & Zang, H., 15 Medi 2021, Yn: Science of the Total Environment. 787, 147444.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl adolygu › adolygiad gan gymheiriaid

  60. Cyhoeddwyd

    Nutrient stripping: the global disparity between food security and soil nutrient stocks

    Jones, D. L., Cross, P., Withers, P., DeLuca, T., Quilliam, R., Harris, I., Chadwick, D. & Edwards-Jones, G., 8 Mai 2013, Yn: Journal of Applied Ecology. 50, t. 851-862

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl adolygu › adolygiad gan gymheiriaid

  61. Cyhoeddwyd

    Organic acids in the rhizosphere - a critical review

    Jones, D. L., 30 Awst 1998, Yn: Plant and Soil. 205, 1, t. 25-44

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl adolygu › adolygiad gan gymheiriaid

  62. Cyhoeddwyd

    Paddy soils have a much higher microbial biomass content than upland soils: A review of the origin, mechanisms, and drivers

    Wei, L., Ge, T., Zhu, Z., Ye, R., Penuelas, J., Li, Y., Lynn, T. M., Jones, D. L., Wu, J. & Kuzyakov, Y., 1 Maw 2022, Yn: Agriculture, Ecosystems and Environment. 326

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl adolygu › adolygiad gan gymheiriaid

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