Dr David Johnson
Senior lecturer
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Personal Details
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Biography
Ph.D. University of Sheffield 1998
M.Sc. Soil Science. University of Aberdeen 1994.
B.Sc. (Hons.) Environmental technology. University of Sunderland 1993
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Research Interests
I am interested in:
1. Quantifying carbon transfer between plants and soils.
2. The importance of both intra- and inter-specific diversity of plants and microbes in regulating ecosystem functioning.
3. The impact of nitrogen deposition and global climate change on semi-natural ecosystems
4. Interactions between mycorrhizal fungi and other soil organisms, including pathogenic fungi, soil invertebrates, leaf herbivores and bacteria.
5. The ecology of mycorrhizal fungi.
The are addressed using stable and radioisotope tracers in a range of ecosystems including native pine woodland, semi-natural grassland, peatlands, montane heaths and cropped systems.
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Current Research
Current research students:
1. A. Wilkinson, NERC funded. "Regulation of soil respiration by mycorrhizal fungi-does diversity matter? (with Prof Ian Alexander) 2007-2010.
2. U. Kritzler, NERC Open CASE. "The significance of ericoid mycorrhizal mycelium for carbon turnover in heathland" (with Prof I Alexander and Dr RRE Artz, Macaulay Institute). 2008-2012.
3. S. Popoola, Self funded "Interactions between mycorrhizal fungi and crop pathogens in inter-cropped farming system-implications for phosphorus uptake". 2008-2011.
4. M. F. Ahmad Ramli, Malaysian Government funded. "Phosphorus turnover in organic soils". 2008-2011.
5. Z. Babikova, NERC Open CASE. "How do interactions between herbivores and mycorrhizal fungi regulate production of plant signalling compounds and parasitoid behaviour?" (with Prof J Pickett FRS and Dr T Bruce, Rothamsted Research and Dr L Gilbert, Macaulay Institute). 2009-2012.
6. S. Smith, BBSRC "Enhancing carbon sequestration through grazing management" (with Dr R van der Wal and Dr S Woodin). 2009-2012.
7. R. Tajuddin, Malaysian Government. "Role of specialist and generalist ectomycorrhizal fungi in forests" (with Prof I Alexander). 2009-2012.
8. L. Moore, NERC. "Interactions between ectomycorrhizal fungi and lower plants" (with Dr S Woodin). 2010-2014.
9. B. Khan, British Council Commonwealth Scholarship. "Interactions between arsenic and mycorrhizal fungi in agroforestry crops" (with Prof AA Meharg). 2010-2014.
Completed studentships:
1. C. J. Trinder, BBSRC funded. "Carbon cycling in regenerating peatlands". (With Dr RRE Artz, Macaulay Institute). 2004-2007.
2. N. Papanikolaou, DEFRA/Macaulay Institute. "Impacts of increased nitrogen deposition on carbon and nutrient dynamics in montane ecosystems". 2004-2007.
3. M. T. Prendergast, NERC funded. Does carbon flux from mycorrhizal fungi stimulate N2O production in soils? (With Dr EM Baggs) 2005-2008.
4. P. Currey, 6th Century/Macaulay funded. Interactions between atmospheric nitrogen deposition and carbon dynamics in peatlands. (With Dr RRE Artz, Macaulay Institute). 2005 -2009.
5. E. Siasou, 6th Century/Greek Government. Interactions among a soil-borne pathogen, mycorrhizal fungi and rhizobacteria (With Prof K Killham and Dr D Standing). 2006-2010.
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Collaborations
Centre for Plants and the Environment, University of Western Sydney
ECOS, at EPFL Lausanne
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Research Grants
"The importance of intra- and interspecific diversity of ectomycorrhizal fungi on ecosystem functioning" October 2011-Sept 2014. NERC Standard. Value £516,797. NE/I014527/1.
"Contribution of arbuscular mycorrhizal fungi to carbon fluxes in grassland in response to climate manipulation" May 2011-October 2011. NERC Small. Value £64,928. NE/I017097/1.
"Linkages between plant functional diversity, soil biological communities and ecosystem services in agricultural grassland" June 2011-May 2016. BBSRC Responsive. Value: ~£1.5M (Aberdeen £353,238). PI: Prof RD Bardgett.
"Contribution of plant intraspecific diversity to carbon turnover in grassland" May 2010-January 2011. NERC Small Grant. Value: £51,426. NE/H010939/1.
"How do interactions between herbivores and mycorrhizal fungi regulate production of plant signalling compounds and parasitoid behaviour?" October 2009-March 2013. NERC Open CASE. Value £65,937. NE/G012008/1.
"Unravelling the functional diversity of fungi in ericaceous hair roots" NERC Small Grant (with Prof IJ Alexander). July 2009-October 2010. Value: £53,059. NE/G010404/1.
"The significance of ericoid mycorrhizal mycelium for carbon turnover in heathland" October 2008-March 2012. NERC Open CASE. Value £67,173. NE/F013760/1.
"Can plant genotypic diversity select for mycorrhizal fungal diversity in grasslands?" Royal Society. June 2006-May 2007. Value: £7700.
"Mycorrhizal interactions in native pinewoods: are ericoid and ectomycorrhizal fungi genetically and functionally distinct?" October 2004-October 2009. NERC Standard (with Prof IJ Alexander) Value: £291,966. NE/C003128/1.
"Influence of soil mesofaunal communities on carbon flux to ectomycorrhizal fungi and saprotrophic microorganisms" September 2004-September 2006. Funding: NERC. Value: £50,483. NE/C507510/1
NERC Advanced Fellowship. "Does below ground carbon allocation drive soil biodiversity in Boreal forests?" Sept. 2003-Sept 2008. Value: £243,604. NER/J/S/2002/00652
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Teaching Responsibilities
Postgraduate:
Programme coordinator (with Rene ven der Wal) of MSc Ecology/MRes Environmental Sustainability
Coordinator for PL5504 Biology and Ecology of Mycorrhizas and EK5502 Advanced Ecological Concepts
Contribute to BI5009 Experimental Design and Analysis, EV5004 Microbial Ecology and PL5303 Ecosystem Processes
Undergraduate:
Biology for Undergraduates; Ecosystem Processes; Plant Diversity
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External Responsibilities
Full member NERC Peer Review College (2008-).
Board of Advisors, New Phytologist.
NERC Tropical Forests working Group
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Selected Publications
36. Currey P, Johnson D, Sheppard LJ, Leith ID, Toberman H, Van der Wal R, Dawson LA & Artz RRE (2009) Turnover of labile and recalcitrant soil carbon differ in response to nitrate and ammonium deposition in an ombrotrophic peatland. Global Change Biology (In Press).
35. Kritzler U & Johnson D (2010) Mineralisation of carbon and plant uptake of phosphorus from microbially-derived organic matter in response to 19 years simulated nitrogen deposition. Plant & Soil 326, 311-319.
34. Grelet G-A, Johnson D, Paterson E, Anderson IC & Alexander IJ (2009) Reciprocal carbon and nitrogen transfer between an ericaceous dwarf shrub and fungi isolated from Piceirhiza bicolorata ectomycorrhizas. New Phytologist 182: 359–366. [Rapid Report]
33. Siasou E, Standing D, Killham K & Johnson D (2009) Mycorrhizal fungi increase biocontrol potential of Pseudomonas fluorescens. Soil Biology & Biochemistry 41, 1341-1343.
32. Trinder CJ, Johnson D & Artz RRE (2009) Litter type, but not plant cover, regulates initial litter decomposition and fungal community structure in a recolonising cutover peatland. Soil Biology & Biochemistry 41, 651-655.
31. Johnson D (2008) Resolving uncertainty in the carbon economy of mycorrhizal fungi. New Phytologist 180, 2-5.
30. Johnson D, Phoenix GK & Grime JP (2008) Plant community composition regulates soil respiration in grasslands. Biology Letters 4, 345–348.
29. Trinder CJ, Johnson D & Artz, RRE (2008) Interactions between fungal community structure, litter decomposition and depth of water-table in a cutover peatland. FEMS Microbiology Ecology 64, 433-448.
28. Phoenix GK, Johnson D, Grime JP & Booth RE (2008). Sustaining ecosystem services in ancient limestone grassland: importance of major component plants and community composition. Journal of Ecology 96, 894-902.
27. Trinder CJ, Artz RRE & Johnson D (2008) Contribution of plant photosynthate to soil respiration and dissolved organic carbon in a naturally recolonising cutover peatland. Soil Biology & Biochemistry 40, 1622-1628.
26. Trinder CJ, Artz RRE & Johnson D (2008) Temporal patterns of litter production by vascular plants and its decomposition rate in cut-over peatlands. Wetlands 28, 245-250.
25. Yan Y, Artz RRE & Johnson D (2008) Species-specific effects of plants colonising cutover peatlands on patterns of carbon source utilisation by soil microorganisms. Soil Biology & Biochemistry 40, 544-549.
24. Phuyal M, Artz RRE, Sheppard L, Leith I & Johnson D (2007) Long-term nitrogen deposition increases phosphorus limitation of bryophytes in an ombrotrophic bog. Plant Ecology 196, 111-121.
23. Foereid B, Dawson LA, Johnson D & Rangel-Castro JI (2006) Fate of carbon in upland grassland subjected to liming using in situ 13CO2 pulse-labelling. Plant & Soil 287, 301-311.
22. Leake JR, Ostle NJ, Rangel-Castro JI & Johnson D (2006) Carbon fluxes from plants through soil organisms determined by field 13CO2 pulse-labelling in an upland grassland. Applied Soil Ecology 33, 152-175.
21. Johnson D, Krsek M, Wellington EMH, Stott AW, Cole L, Bardgett RD, Read DJ, Leake JR (2005) Soil invertebrates disrupt carbon flow through fungal networks. Science 309: 1047-1047.
20. Johnson D, Ijdo M, Anderson IC, Alexander IJ (2005). Do plant communities influence microbial diversity and function? Comparative Biochemistry & Physiology A-Molecular & Integrative Physiology 141, S220-S220.
19. Johnson D (2005) Underworld Connections. Biologist 52, 155-160.
18. Johnson D, IJdo M, Genney DR, Anderson IC & Alexander IJ (2005) How do plants regulate the function, community structure and diversity of mycorrhizal fungi? Invited paper for Journal of Experimental Botany 56, 1751-1760.
17. Pilkington MG, Caporn SJM, Carroll JA, Cresswell N, Lee JA, Ashenden TW, Brittain SA, Emmett BA & Johnson D. (2005) Effects of increased deposition of atmospheric nitrogen on an upland Calluna moor: N and P transformations. Environmental Pollution 135, 469-480.
16. Johnson D, Leake JR & Read DJ. (2005) Liming and nitrogen fertilization affects phosphatase activities, microbial biomass and mycorrhizal colonisation in an upland grassland. Plant & Soil 271, 157-164.
15. Leake JR, Johnson D, Donnelly DP, Muckle G, Boddy L & Read DJ. (2004) Networks of power and influence: the role of mycorrhizal mycelium in controlling plant communities and agroecosystem functioning. Canadian Journal of Botany 82, 1016-1045.
14. Johnson D, Vandenkoornhuyse PJ, Leake JR, Gilbert LA, Booth RE, Grime JP, Young JPW & Read DJ. (2004) Plant communities affect arbuscular mycorrhizal fungal diversity and community composition in grassland microcosms. New Phytologist 161, 503-516.
13. Johnson D, Campbell CD, Lee JA, Callaghan T & Gwynn-Jones D. (2003) Elevated UV-B radiation affects Arctic soil microbial communities. Nature 423, 138.
12. Johnson D. (2003) Response of terrestrial microorganisms to ultraviolet-B radiation in ecosystems. Invited paper for Research in Microbiology 154, 315-320.
11. Carroll JA, Caporn SJM, Johnson D, Morecroft MD & Lee JA. (2003) The interactions between plant growth, vegetation structure and soil processes in semi-natural acidic and calcareous grasslands receiving long-term inputs of simulated pollutant nitrogen deposition. Environmental Pollution 121, 363-376.
10. Johnson D, Booth RE, Whiteley AS, Bailey MJ, Read DJ, Grime, JP & Leake JR. (2003) Plant community composition affects the biomass, activity and diversity of soil microorganisms in reconstituted calcareous grassland. European Journal of Soil Science54, 671-678.
9. Johnson D, Leake JR & Read DJ. (2002). Transfer of recent photosynthate into mycorrhizal mycelium of an upland grassland: short-term respiratory losses and accumulation of 14C. Soil Biology & Biochemistry 34, 1521-1524.
8. Johnson D, Campbell CD, Lee JA, Callaghan T & Gwynn-Jones D. (2002) Arctic microorganisms respond more to elevated UV-B radiation than CO2. Nature 416, 82-83.
7. Johnson D, Leake JR, Ostle N, Ineson P & Read DJ. (2002). In situ 13CO2 pulse-labelling of upland grassland demonstrates a rapid pathway of carbon flux from arbuscular mycorrhizal mycelium to the soil. New Phytologist 153, 327-334.
6. Johnson D, Leake JR & Read DJ. (2001). Novel in-growth core system enables functional studies of grassland mycorrhizal mycelial networks. New Phytologist 152, 555-562.
5. Carroll JA, Johnson D, Morecroft M, Taylor AFS, Caporn SJM & Lee JA (2000) The effect of long-term nitrogen additions on bryophyte cover of upland acidic grasslands. Journal of Bryology 22, 83-91.
4. Johnson D, Leake JR & Lee JA (1999). The effects of quantity and duration of simulated pollutant nitrogen deposition on root-surface phosphatase activities in calcareous and acid grasslands: a bioassay approach. New Phytologist 141, 433-442.
3. Lee JA, Caporn SJM, Carroll J, Foot JP, Johnson D, Potter L, Taylor AFS & Carroll JA (1998). Effects of ozone and atmospheric nitrogen deposition on bryophytes. In: JW Bates, NW Ashton, JG Duckett eds. Bryology for the twenty-first Century. The Centenary Symposium of the British Bryological Society. pp.331-341.
2. Johnson D, Leake JR, Lee JA & Campbell CD (1998). Changes in soil microbial biomass and microbial activities in response to seven years simulated pollutant nitrogen deposition on a heathland and two grasslands. Environmental Pollution 103, 239-250.
1. Green N, Johnson D & Wilkins BT (1996). Factors affecting the transfer of radionuclides to sheep grazing on pastures reclaimed from the sea. Journal of Environmental Radioactivity 30, 173-183.
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