Andy Midwood
Andy Midwood is a Honorary Associate of the Environmental and Biochemical Sciences department. This group is comprised of chemists and biochemists; as well as biogeochemists and hydrologists, soil scientists and mineralogists. It has extensive analysis capabilities enabling work from the molecular level to an entire river catchment scale. The group is a regular host to visitors and collaborators from a worldwide network, and with staff and students is home to over 100 people.
Current research interests
Rising atmospheric CO2 levels, the uncertainties of climate change and how all of this impacts the natural environment frames Andy’s research. He has over the last 20 years used a wide range of stable isotope applications to study soil-plant interactions and has focused particularly on soil carbon dynamics in an effort to understand how this huge terrestrial pool of carbon will respond to the changing world in which we live.
As a postdoc with Professor Tom Boutton’s Group based at Texas A&M University, he used a natural C3/C4 transition created by woody plants encroaching into a natural savannah grassland in south-west Texas to initially study soil C dynamics.
More recently working with Professor Pete Millard he developed a natural abundance 13C isotope technique to study the evolution of CO2 from soils. Broadly speaking this efflux can be divided into autotrophic respiration: that associated with plant roots and the rhizosphere, which is directly fuelled by plant derived C and heterotrophic respiration which is associated with the turnover of older C associated with organic matter. Being able to partition this efflux is potentially very powerful and allows a better understanding of the long term carbon status of a soil.
Andy has active links with a number of colleagues across the world including Pete Millard, David Whitehead and John Hunt at Landcare Research in New Zealand; Melanie Jones and Kirsten Hannam at the University of British Columbia, Okanagan and Denise Neilsen at Ag Canada in Summerland. With Professor David Robinson at University of Aberdeen he co-supervises two PhD students.
He is a Chartered Chemist and Member of the Royal Society of Chemistry, Member of the American Geophysical Union and an honorary reader at the Robert Gordon University where he lectures on mass spectrometry.
Bibliography
- Birkel, C.; Helliwell, R.C.; Thornton, B.; Gibbs, S.; Cooper, P.; Soulsby, C.; Tetzlaff, D.; Spezia, L.; Esquivel-Hernandez, G.; Sanchez-Murillo, R.; Midwood, A. (2018) Characterization of surface water isotope spatial patterns of Scotland., Journal of Geochemical Exploration, 194, 71-80.
- van der Heijden, G.; Bel, J.; Craig, C-A.; Midwood, A.J.; Mareschal, L.; Ranger, J.; Dambrine, E.; Legout, A. (2018) Measuring plant-available MG, Ca and K pools in the soil - an isotopic dilution assay., ACS Earth and Space Chemistry, 2, 292-313.
- Souza, I.D.; Arrivabene, H.P.; Craig, C-A.; Midwood, A.J.; Thornton, B.; Matsumoto, S.T.; Elliott, M.; Wunderlin, D.A.; Monferrán, M.V.; Fernandes, M.N. (2018) Interrogating pollution sources in a mangrove food web using multiple stable isotopes., Science of the Total Environment, 640-641, 501-511.
- Moinet, G.Y.K.; Hunt, J.E.; Kirschbaum, M.U.F.; Morcom, C.P.; Midwood, A.J.; Millard, P. (2018) The temperature sensitivity of soil organic matter decomposition is constrained by microbial access to substrates'., Soil Biology and Biochemistry, 116, 333-339.
- Moinet, G.Y.K.; Midwood, A.J.; Hunt, J.E.; Whitehead, D.; Hannam, K.D.; Jenkins, M.; Brewer, M.J.; Adams, M.A.; Millard, P. (2018) Estimates of rhizosphere priming effects are affected by soil disturbance., Geoderma, 313, 1-6
- Snell, H.S.K.; Robinson, D.; Midwood, A.J. (2016) Tree species' influences on soil carbon dynamics revealed with natural abundance C-13 techniques., Plant and Soil, 400, 285-296.
- Hannam, K.D.; Kehila, D.; Millard, P.; Midwood, A.J.; Neilsen, D.; Neilsen, G.H.; Forge, T.A.; Nichol, C.; Jones, M.D. (2016) Bicarbonates in irrigation water contribute to carbonate formation and CO2 production in orchard soils under drip irrigation., Geoderma, 266, 120-126.
- Hannam, K.D.; Neilsen, G.H.; Neilsen, D.; Midwood, A.J.; Millard, P.; Zhang, Z.L.; Thornton, B.; Steinke, D. (2016) Amino acid composition of grape (Vitis vinifera L.) juice in response to applications of urea to the soil or foliage., American Journal of Enology and Viticulture, 67, 47-55.
- Thornton, B.; Martin, G.; Procee, M.; Miller, D.R.; Coull, M.C.; Yao, H.-Y.; Chapman, S.J.; Hudson, G.; Midwood, A.J. (2015) Distributions of carbon and nitrogen isotopes in Scotland's topsoil: a national-scale study., European Journal of Soil Science, 66, 1002-1011.
- Snell, H.S.K.; Robinson, D.; Midwood, A.J. (2015) Sampling root-respired CO2 in-situ for C-13 measurement., Plant and Soil, 393, 259-271.
- Snell, H.S.K.; Robinson, D.; Midwood, A.J. (2014) Minimising methodological biases to improve the accuracy of partitioning soil respiration using natural abundance 13C., Rapid Communications in Mass Spectrometry, 28, 2341-2351.
- Hannam, K.D.; Neilsen, G.H.; Neilsen, D.; Rabie, W.S.; Midwood, A.J.; Millard, P. (2014) Late-season foliar urea applications can increase berry yeast-assimilable nitrogen in winegrapes (Vitis vinifera L.)., American Journal of Enology and Viticulture, 65, 89-95.
- Zakharova, A.; Midwood, A.J.; Hunt, J.E.; Graham, S.L.; Artz, R.R.E.; Turnbull, M.H.; Whitehead, D.; Millard, P. (2014) Loss of labile carbon following soil disturbance determined by measurement of respired d¹³CO., Soil Biology and Biochemistry, 68, 125-132.
- Mayor, D.J.; Gray, N.B.; Elver-Evans, J.; Midwood, A.J.; Thornton, B. (2013) Metal-macrofauna interactions determine microbial community structure and function in copper contaminated sediments., PLoS ONE, 8, Article No. e64940.
- van der Heijden, G.A.; Legout, A.; Midwood, A.J.; Craig, C.A.; Pollier, B.; Ranger, J.; Dambrine, E. (2013) Mg and Ca root uptake and vertical transfer in soils assessed by an in situ ecosystem scale multi-isotopic (26Mg & 44Ca) tracing experiment in a beech stand (Breuil-Chenue, France)., Plant and Soil, 369, 33-45.
- Thornton, B.; Zhang, Z.L.; Mayes, R.W.; Hogberg, M.N.; Midwood, A.J. (2011) Can gas chromatography combustion isotope ratio mass spectrometry be used to quantify organic compound abundance?, Rapid Communications in Mass Spectrometry, 25, 2433-2438.
- Augusto, L.; Zeller, B.; Midwood, A.J.; Swanston, C.; Dambrine, E.; Schneider, A.; Bosc, A. (2011) Two year dynamics of foliage labelling in 8 year-old Pinus pinaster trees with 15N 26Mg and 42Ca - simulation of Ca transport using an upscaling approach., Annals of Forest Science, 68, 169-178.
- Midwood, A.J.; Millard, P. (2011) Challenges in measuring the d13C of the soil surface CO2 efflux., Rapid Communications in Mass Spectrometry, 25, 232-242.
- Ascough, P.L.; Bird, M.I.; Francis, S.M.; Thornton, B.; Midwood, A.J.; Scott, A.; Apperley, D. (2011) Variability in oxidative degradation of charcoal: influence of production variables and environmental exposure., Geochimica et Cosmochimica Acta, 75, 2361-2378.
- Paterson, E.; Neilson, R.; Midwood, A.J.; Osborne, S.M.; Sim, A.; Thornton, B.; Millard, P. (2011) Altered food web structure and C-flux pathways associated with mineralisation of organic amendments to agricultural soil., Applied Soil Ecology, 48, 107-116.
- Zetsche, E.; Thornton, B.; Midwood, A.J.; Witte, U. (2011) Utilisation of different carbon sources in a shallow estuary identified through stable isotope techniques., Continental Shelf Research, 31, 832-840.
- Hogberg, M.N.; Briones, M.J.I.; Keel, S.G.; Metcalfe, D.B.; Campbell, C.; Midwood, A.J.; Thornton, B.; Hurry, V.; Linder, S.; Nasholm, T.; Hogberg, P. (2010) Quantification of effects of season and nitrogen supply on tree belowground carbon transfer., New Phytologist, 187, 485-493.
- Millard, P.; Midwood, A.J.; Hunt, J.E.; Barbour, M.M.; Whitehead, D. (2010) Quantifying the contribution of soil organic matter turnover to forest soil respiration using natural abundance delta 13C., Soil Biology and Biochemistry, 42, 935-943.
- Paterson, E.; Midwood, A.J.; Millard, P. (2009) Through the eye of the needle: A review of isotope approaches to quantify processes mediating soil carbon balance., New Phytologist, 184, 19-33.
- Midwood, A.J.; Thornton, B.; Millard, P. (2008) Measuring the 13C content of soil respired CO2 using a novel open chamber system., Rapid Communications in Mass Spectrometry, 22, 2073-2081.
- Paterson, E.; Thornton, B.; Midwood, A.J.; Osborne, S.M.; Sim, A.; Millard, P. (2008) Atmospheric CO2 enrichment and nutrient additions to planted soil increase mineralisation of soil organic matter, but do not alter microbial utilisation of plant and soil C-sources., BSSS web site
- Millard, P.; Midwood, A.J.; Hunt, J.E.; Whitehead, D.; Boutton, T. (2008) Partitioning soil surface CO2 efflux into autotrophic and heterotrophic components, using natural gradients in soil &13C in an undisturbed savannah soil., Soil Biology and Biochemistry, 40, 1575-1582.
- Midwood, A.J. (2008) Stable isotope methods for estimating the labile metal content of soils., In: Willey, N. (ed.). Phytoremediation: Methods and Reviews., Humana Press, New Jersey, Methods in Biotechnology 23, 149-159.
- Midwood, A.J.; Gebbing, T.; Wendler, R.; Sommerkorn, M.; Hunt, J.; Millard, P. (2006) Collection and storage of CO2 for 13C analysis: an application to separate soil CO2 efflux into root and soil derived components., Rapid Communications in Mass Spectrometry, 20, 3379-3384.
- Weatherall, A.; Proe, M.F.; Craig, J.; Cameron, A.D.; Midwood, A.J. (2006) Internal cycling of nitrogen, potassium and magnesium in young Sitka spruce., Tree Physiology, 26, 673-680.
- Weatherall, A.; Craig, J.; Cameron , A.D.; McKay, H.M.; Proe, M.F.; Midwood, A.J. (2006) Tracing N, K, Mg and Ca released from decomposing biomass to new tree growth. Part II: A model system simulating root decomposition on clearfell sites., Biomass and Bioenergy, 30, 1060-1066.
- Weatherall, A.; Proe, M.F.; Craig, J.; Cameron , A.D.; McKay, H.M.; Midwood, A.J. (2006) Tracing N, K, Mg and Ca released from decomposing biomass to new tree growth. Part I: A model system simulating harvest residue decomposition on conventionally harvested clearfell sites., Biomass and Bioenergy, 30, 1053-1059.
- Paterson, E., Thornton, B., Midwood, A. and Sim, A. (2005) Defoliation alters the relative contributions of recent and non-recent assimilate to root exudation from Festuca rubra., Plant Cell and Environment, 28, 1525-1533.
- Thornton, B.; Paterson, E.; Midwood, A.J.; Sim, A.; Pratt, S.M. (2004) Contribution of current carbon assimilation in supplying root exudates of Lolium perenne measured using steady-state 13C labelling., Physiologia Plantarum, 120, 434-441.
- Ayoub, A.S.; McGaw, B.A.; Shand, C.A.; Midwood, A.J. (2003) Phytoavailability of Cd and Zn in soil estimated by stable isotope exchange and chemical extraction., Plant and Soil, 252, 291-300.
- Ayoub, A.S.; McGaw, B.A.; Midwood, A.J. (2002) Determination of Cd and Zn by isotope dilution - thermal ionisation mass spectrometry using a sequential analysis procedure., Talanta, 57, 405-413.
- Midwood, A.J., Paterson, E. and Thornton, B. (2002) Steady-state 13C labeling of Lolium perenne (ryegrass): comparison of plant with root exudate isotope signatures., The 9th Canadian Continuous-Flow Isotope Ratio Mass Spectrometry Workshop, University of Newfoundland, St John's Newfoundland, August 25-28, 2002, p3.8
- Midwood, A.J.; Proe, M.F.; Harthill, J.J. (2000) Use and analysis by thermal ionisation mass spectrometry of Mg-26 and K -41to assess mineral uptake in Scots pine (Pinus sylvestris L.)., The Analyst, 125(3), 487-492.
- Proe, M.F., Midwood, A.J. and Craig, J. (2000) Use of stable isotopes to quantify nitrogen, potassium and magnesium dynamics in young Scots pine (Pinus sylvestris)., New Phytologist, 146, 461-469.
- Midwood, A.J. and McGaw, B.A. (1999) Highlight : Recent developments in the analysis of light isotopes by continuous flow isotope ratio mass spectrometry., Analytical Communications, 36, 291-294.
- Birkel, C.; Helliwell, R.C.; Thornton, B.; Gibbs, S.; Cooper, P.; Soulsby, C.; Tetzlaff, D.; Spezia, L.; Esquivel-Hernandez, G.; Sanchez-Murillo, R.; Midwood, A. (2018) Characterization of surface water isotope spatial patterns of Scotland., Journal of Geochemical Exploration, 194, 71-80.
- van der Heijden, G.; Bel, J.; Craig, C-A.; Midwood, A.J.; Mareschal, L.; Ranger, J.; Dambrine, E.; Legout, A. (2018) Measuring plant-available MG, Ca and K pools in the soil - an isotopic dilution assay., ACS Earth and Space Chemistry, 2, 292-313.
- Souza, I.D.; Arrivabene, H.P.; Craig, C-A.; Midwood, A.J.; Thornton, B.; Matsumoto, S.T.; Elliott, M.; Wunderlin, D.A.; Monferrán, M.V.; Fernandes, M.N. (2018) Interrogating pollution sources in a mangrove food web using multiple stable isotopes., Science of the Total Environment, 640-641, 501-511.
- Moinet, G.Y.K.; Hunt, J.E.; Kirschbaum, M.U.F.; Morcom, C.P.; Midwood, A.J.; Millard, P. (2018) The temperature sensitivity of soil organic matter decomposition is constrained by microbial access to substrates'., Soil Biology and Biochemistry, 116, 333-339.
- Moinet, G.Y.K.; Midwood, A.J.; Hunt, J.E.; Whitehead, D.; Hannam, K.D.; Jenkins, M.; Brewer, M.J.; Adams, M.A.; Millard, P. (2018) Estimates of rhizosphere priming effects are affected by soil disturbance., Geoderma, 313, 1-6
- Snell, H.S.K.; Robinson, D.; Midwood, A.J. (2016) Tree species' influences on soil carbon dynamics revealed with natural abundance C-13 techniques., Plant and Soil, 400, 285-296.
- Hannam, K.D.; Kehila, D.; Millard, P.; Midwood, A.J.; Neilsen, D.; Neilsen, G.H.; Forge, T.A.; Nichol, C.; Jones, M.D. (2016) Bicarbonates in irrigation water contribute to carbonate formation and CO2 production in orchard soils under drip irrigation., Geoderma, 266, 120-126.
- Hannam, K.D.; Neilsen, G.H.; Neilsen, D.; Midwood, A.J.; Millard, P.; Zhang, Z.L.; Thornton, B.; Steinke, D. (2016) Amino acid composition of grape (Vitis vinifera L.) juice in response to applications of urea to the soil or foliage., American Journal of Enology and Viticulture, 67, 47-55.
- Thornton, B.; Martin, G.; Procee, M.; Miller, D.R.; Coull, M.C.; Yao, H.-Y.; Chapman, S.J.; Hudson, G.; Midwood, A.J. (2015) Distributions of carbon and nitrogen isotopes in Scotland's topsoil: a national-scale study., European Journal of Soil Science, 66, 1002-1011.
- Snell, H.S.K.; Robinson, D.; Midwood, A.J. (2015) Sampling root-respired CO2 in-situ for C-13 measurement., Plant and Soil, 393, 259-271.
- Snell, H.S.K.; Robinson, D.; Midwood, A.J. (2014) Minimising methodological biases to improve the accuracy of partitioning soil respiration using natural abundance 13C., Rapid Communications in Mass Spectrometry, 28, 2341-2351.
- Hannam, K.D.; Neilsen, G.H.; Neilsen, D.; Rabie, W.S.; Midwood, A.J.; Millard, P. (2014) Late-season foliar urea applications can increase berry yeast-assimilable nitrogen in winegrapes (Vitis vinifera L.)., American Journal of Enology and Viticulture, 65, 89-95.
- Zakharova, A.; Midwood, A.J.; Hunt, J.E.; Graham, S.L.; Artz, R.R.E.; Turnbull, M.H.; Whitehead, D.; Millard, P. (2014) Loss of labile carbon following soil disturbance determined by measurement of respired d¹³CO., Soil Biology and Biochemistry, 68, 125-132.
- Mayor, D.J.; Gray, N.B.; Elver-Evans, J.; Midwood, A.J.; Thornton, B. (2013) Metal-macrofauna interactions determine microbial community structure and function in copper contaminated sediments., PLoS ONE, 8, Article No. e64940.
- van der Heijden, G.A.; Legout, A.; Midwood, A.J.; Craig, C.A.; Pollier, B.; Ranger, J.; Dambrine, E. (2013) Mg and Ca root uptake and vertical transfer in soils assessed by an in situ ecosystem scale multi-isotopic (26Mg & 44Ca) tracing experiment in a beech stand (Breuil-Chenue, France)., Plant and Soil, 369, 33-45.
- Thornton, B.; Zhang, Z.L.; Mayes, R.W.; Hogberg, M.N.; Midwood, A.J. (2011) Can gas chromatography combustion isotope ratio mass spectrometry be used to quantify organic compound abundance?, Rapid Communications in Mass Spectrometry, 25, 2433-2438.
- Augusto, L.; Zeller, B.; Midwood, A.J.; Swanston, C.; Dambrine, E.; Schneider, A.; Bosc, A. (2011) Two year dynamics of foliage labelling in 8 year-old Pinus pinaster trees with 15N 26Mg and 42Ca - simulation of Ca transport using an upscaling approach., Annals of Forest Science, 68, 169-178.
- Midwood, A.J.; Millard, P. (2011) Challenges in measuring the d13C of the soil surface CO2 efflux., Rapid Communications in Mass Spectrometry, 25, 232-242.
- Ascough, P.L.; Bird, M.I.; Francis, S.M.; Thornton, B.; Midwood, A.J.; Scott, A.; Apperley, D. (2011) Variability in oxidative degradation of charcoal: influence of production variables and environmental exposure., Geochimica et Cosmochimica Acta, 75, 2361-2378.
- Paterson, E.; Neilson, R.; Midwood, A.J.; Osborne, S.M.; Sim, A.; Thornton, B.; Millard, P. (2011) Altered food web structure and C-flux pathways associated with mineralisation of organic amendments to agricultural soil., Applied Soil Ecology, 48, 107-116.
- Zetsche, E.; Thornton, B.; Midwood, A.J.; Witte, U. (2011) Utilisation of different carbon sources in a shallow estuary identified through stable isotope techniques., Continental Shelf Research, 31, 832-840.
- Hogberg, M.N.; Briones, M.J.I.; Keel, S.G.; Metcalfe, D.B.; Campbell, C.; Midwood, A.J.; Thornton, B.; Hurry, V.; Linder, S.; Nasholm, T.; Hogberg, P. (2010) Quantification of effects of season and nitrogen supply on tree belowground carbon transfer., New Phytologist, 187, 485-493.
- Millard, P.; Midwood, A.J.; Hunt, J.E.; Barbour, M.M.; Whitehead, D. (2010) Quantifying the contribution of soil organic matter turnover to forest soil respiration using natural abundance delta 13C., Soil Biology and Biochemistry, 42, 935-943.
- Paterson, E.; Midwood, A.J.; Millard, P. (2009) Through the eye of the needle: A review of isotope approaches to quantify processes mediating soil carbon balance., New Phytologist, 184, 19-33.
- Midwood, A.J.; Thornton, B.; Millard, P. (2008) Measuring the 13C content of soil respired CO2 using a novel open chamber system., Rapid Communications in Mass Spectrometry, 22, 2073-2081.
- Paterson, E.; Thornton, B.; Midwood, A.J.; Osborne, S.M.; Sim, A.; Millard, P. (2008) Atmospheric CO2 enrichment and nutrient additions to planted soil increase mineralisation of soil organic matter, but do not alter microbial utilisation of plant and soil C-sources., BSSS web site
- Millard, P.; Midwood, A.J.; Hunt, J.E.; Whitehead, D.; Boutton, T. (2008) Partitioning soil surface CO2 efflux into autotrophic and heterotrophic components, using natural gradients in soil &13C in an undisturbed savannah soil., Soil Biology and Biochemistry, 40, 1575-1582.
- Midwood, A.J.; Gebbing, T.; Wendler, R.; Sommerkorn, M.; Hunt, J.; Millard, P. (2006) Collection and storage of CO2 for 13C analysis: an application to separate soil CO2 efflux into root and soil derived components., Rapid Communications in Mass Spectrometry, 20, 3379-3384.
- Weatherall, A.; Proe, M.F.; Craig, J.; Cameron, A.D.; Midwood, A.J. (2006) Internal cycling of nitrogen, potassium and magnesium in young Sitka spruce., Tree Physiology, 26, 673-680.
- Weatherall, A.; Craig, J.; Cameron , A.D.; McKay, H.M.; Proe, M.F.; Midwood, A.J. (2006) Tracing N, K, Mg and Ca released from decomposing biomass to new tree growth. Part II: A model system simulating root decomposition on clearfell sites., Biomass and Bioenergy, 30, 1060-1066.
- Weatherall, A.; Proe, M.F.; Craig, J.; Cameron , A.D.; McKay, H.M.; Midwood, A.J. (2006) Tracing N, K, Mg and Ca released from decomposing biomass to new tree growth. Part I: A model system simulating harvest residue decomposition on conventionally harvested clearfell sites., Biomass and Bioenergy, 30, 1053-1059.
- Paterson, E., Thornton, B., Midwood, A. and Sim, A. (2005) Defoliation alters the relative contributions of recent and non-recent assimilate to root exudation from Festuca rubra., Plant Cell and Environment, 28, 1525-1533.
- Thornton, B.; Paterson, E.; Midwood, A.J.; Sim, A.; Pratt, S.M. (2004) Contribution of current carbon assimilation in supplying root exudates of Lolium perenne measured using steady-state 13C labelling., Physiologia Plantarum, 120, 434-441.
- Ayoub, A.S.; McGaw, B.A.; Shand, C.A.; Midwood, A.J. (2003) Phytoavailability of Cd and Zn in soil estimated by stable isotope exchange and chemical extraction., Plant and Soil, 252, 291-300.
- Ayoub, A.S.; McGaw, B.A.; Midwood, A.J. (2002) Determination of Cd and Zn by isotope dilution - thermal ionisation mass spectrometry using a sequential analysis procedure., Talanta, 57, 405-413.
- Midwood, A.J.; Proe, M.F.; Harthill, J.J. (2000) Use and analysis by thermal ionisation mass spectrometry of Mg-26 and K -41to assess mineral uptake in Scots pine (Pinus sylvestris L.)., The Analyst, 125(3), 487-492.
- Proe, M.F., Midwood, A.J. and Craig, J. (2000) Use of stable isotopes to quantify nitrogen, potassium and magnesium dynamics in young Scots pine (Pinus sylvestris)., New Phytologist, 146, 461-469.
- Boutton, T.W., Archer, S.R. and Midwood, A.J. (1999) Stable isotopes in ecosystem science : structure, function and dynamics of a subtropical savanna., Rapid Communications in Mass Spectrometry, 13, 1263-1277.
- Midwood, A.J. and McGaw, B.A. (1999) Highlight : Recent developments in the analysis of light isotopes by continuous flow isotope ratio mass spectrometry., Analytical Communications, 36, 291-294.
- Midwood, A.J. and Boutton, T.W. (1998) Soil carbonate decomposition by acid has little effect on delta C-13 PDB of organic matter., Soil Biology and Biochemistry, 30, 1301-1307.
- Ascough, P.L.; Bird, M.I.; Francis, S.M.; Thornton, B.; Midwood, A.J.; Scott, A.; Apperley, D. (2011) Variability in oxidative degradation of charcoal: influence of production variables and environmental exposure., Geochimica et Cosmochimica Acta, 75, 2361-2378.
- Paterson, E.; Neilson, R.; Midwood, A.J.; Osborne, S.M.; Sim, A.; Thornton, B.; Millard, P. (2011) Altered food web structure and C-flux pathways associated with mineralisation of organic amendments to agricultural soil., Applied Soil Ecology, 48, 107-116.
- Midwood, A.J. (2008) Stable isotope methods for estimating the labile metal content of soils., In: Willey, N. (ed.). Phytoremediation: Methods and Reviews., Humana Press, New Jersey, Methods in Biotechnology 23, 149-159.
- Midwood, A.J., Paterson, E. and Thornton, B. (2002) Steady-state 13C labeling of Lolium perenne (ryegrass): comparison of plant with root exudate isotope signatures., The 9th Canadian Continuous-Flow Isotope Ratio Mass Spectrometry Workshop, University of Newfoundland, St John's Newfoundland, August 25-28, 2002, p3.8
- Midwood, A.J. and Proe, M.F. (1998) Use of 26Mg and 41K as tracers of mineral uptake in Scots Pine., 23rd Annual Meeting of the British Mass Spectrometry Society, University of Warwick, 13-16 Sept. p104.