Click HERE to view and download the PDFs


Publications


  1. Gallagher, M.E., Liljestrand, F.L., Hockaday, W.C., Masiello, C.A., Plant species, not climate, controls biomass O2:CO2 exchange ratios in deciduous and coniferous ecosystems. JGR-Biogeosciences 2017JG003847.
  2. Gulbranson, E. L., B. F. Jacobs, W. C. Hockaday, M.C. Wiemann, L. A. Michel, Ancient Angiosperm nitrogen uptake strategies inferred from stable isotope analysis of fossil tree rings, Oligocene, Ethiopia, Geology, 2017.DOI:10.1130/G39213.1
  3. T.L. Longbottom, W.C. Hockaday, K.S. Boling, S.I. Dworkin, Effect of ocean oxidation on the chemical structure of marine kerogen, Organic Geochemistry, (in press).
  4. Zachary P. Valdez, W.C. Hockaday, C.A. Masiello, M.E. Gallagher, G.P. Robertson, Soil Carbon and Nitrogen Responses to Nitrogen Fertilizer and Harvesting Rates in Switchgrass Cropping Systems, Bioenergy Research, 10,1, 2017. DOI: 10.1007/s12155-016-9810-7.
  5. James Chang, Jugeshwar Singh, Sungshil Kim, W.C. Hockaday, Cheolho Sim, and Sung Joon Kim, Solid-state NMR reveals differential carbohydrate utilization in diapausing Culex pipiens Nature:Scientific Reports, 6, 37350, 2016. DOI: 10.1038/srep37350.
  6. T.L. Longbottom, W.C. Hockaday, K.S. Boling, G.Y. Li, Y. Letourmy, H.L. Dong, S.I. Dworkin, Organic structural properties of kerogen as predictors of source rock type and hydrocarbon potential, Fuel, 184, 792-798, 2016. DOI: 10.1016/j.fuel.2016.07.066
  7. L.A. Pyle, W.C. Hockaday, T. Boutton, K. Zygourakis, T. Boutton, C.A. Masiello, Chemical and isotopic thresholds in charring: implications for the interpretation of charcoal mass and isotopic data, Environmental Science & Technology, 49 (24), 14057–14064, 2015. DOI: 10.1021/acs.est.5b03087
  8. W. Hockaday, M. Gallagher, C. Masiello, J. Baldock, C. Iversen, R. Norby, Forest soil carbon oxidation state and oxidative ratio responses to elevated CO2. Journal of Geophysical Research-Biogeoscience 120, 2015.DOI: 10.1002/2015JG003010.
  9. S.M. Nesmith, C.J. Wynveen, E. Dixon, C.W. Matson, B.W. Brooks, W.C. Hockaday, M. Schaum, Exploring educators’ environmental education attitudes and Efficacy: Insights from a Texas Wetland Academy, International Journal of Science Education Part B: Communication and Public Engagement. DOI: 10.1080/21548455.2015.1078519.
  10. J. Miesel, W. Hockaday, R. Kolka, P. Townsend. Soil organic matter composition and quality across fire severity gradients in coniferous and deciduous forests of the southern boreal region, Journal of Geophysical Research-Biogeosciences, 120, 1124–1141. DOI: 10.1002/2015JG002959
  11. J. Vogel, D. He, E. Jokela, W. Hockaday, E. Schuur, The effect of fertilization levels and genetic deployment on soil organic carbon constituents, chemistry, and mean residence time in managed loblolly pine (Pinus taeda L.) forests, Forest Ecology and Management (in press) DOI:10.1016/j.foreco.2015.05.020.
  12. B. Dhugana, C. Becker, B. Zekavat, W. Hockaday, C.K. Chambliss, Characterization of slow pyrolysis bio-oil from pine shavings and corn stover feedstocks by negative electrospray ionization-ion mobility high-resolution mass spectrometry, Energy and Fuels, 29(2), 744-753, 2015, DOI: 10.1021/ef5016389.
  13. M.A. Kleber, W. Hockaday, P.S. Nico, Characteristics of biochar Macromolecular Properties, IN: Biochar for Environmental Management: Science and Technology, Ed. J. Lehmann, Earthscan publishers, London, 2015.
  14. D.B. Wiedemeier, S. Abvien, W. Hockaday, M. Keiluweit, M. Kleber, C. Masiello, A.V. McBeath, P.S. Nico, L.A. Pyle, M.P.W. Schneider, R.J. Smernik, G.L. Wiesenberg, M.W.I. Schmidt, Aromaticity and degree of aromatic condensation of chars, Organic Geochemistry, 78, 135-143, 2015.
  15. J. Yao, W. Hockaday, D. Murray, J. White, The storage change of fire-derived soil charcoal in a sub-humid woodland, Journal of Geophysical Research-Biogeosciences, 119, 9, 1807-1819, 2014.
  16. M.E. Gallagher, C.A. Masiello, W. Hockaday, J.A. Baldock, S. Snapp, C.P. McSwiney, Controls on the Oxidative Ratio of Net Primary Production in Agricultural Ecosystems, Biogeochemistry, DOI 10.1007/s10533-014-0024-9, 2014.
  17. A. D. Olaitan, Behrooz Zekavat, Birendra Dhungana, W. Hockaday, C. Kevin Chambliss, Touradj Solouki, Analysis of Volatile Organic Compound Mixtures Using Radiofrequency Ionization/Mass Spectrometry, Chemical Analysis, 6, 4982-4987, 2014.
  18. Michael Nguyen, W. Hockaday, B.L.T. Lau, Probing Temperature-Dependent Organo-Mineral Interactions with molecular spectroscopy and Quartz Crystal Microgravimetry, pp. 189-195, in Soil Carbon, Progress in Soil Science series XXVI, Hartemink, A.E., McSweeney, K. (Eds.), Springer, 2014.
  19. M.P.W. Schneider, L.A. Pyle, K.L. Clark, W. Hockaday, C. Masiello, M. Schmidt, Toward a “molecular thermometer” to estimate the charring temperature of wildland charcoals derived from different biomass sources, Environmental Science & Technology, 47, 11490-11495, 2013.
  20. C. LeCroy, C. Masiello, J. Rudgers, W. Hockaday, J. Silberg, Nitrogen, Biochar, and Mycorrhizae: Alteration of the Symbiosis and Oxidation of Char Surface, Soil Biology and Biochemistry, 58,248-254, 2013
  21. B.L.T. Lau, W. Hockaday, K. Ikuma, O. Furman, A.W. Decho, A preliminary assessment of the interactions between capping agents of silver nanoparticles and environmental organic matter, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 435, 22-27, 2013.
  22. Koarashi, J., W. Hockaday, Trumbore, S., Masiello, C. Dynamics of decadally-cycling carbon in subsurface soils, Journal of Geophysical Research-Biogeosciences, 117, G03033, 2012.
  23. D.F. Cusak, O.A. Chadwick, W. Hockaday, P.M. Vistousek, Mineralogical controls on soil black carbon preservation, Global Biogeochemical Cycles, 26, GB004109, 2012.
  24. H. Sun, W. Hockaday, C.A. Masiello, K. Zygourakis, Multiple controls on the physical and chemical properties of biochars, Industrial & Engineering Chemistry Research, 51, 3587-3597, 2012.
  25. Kinney, T., C.A. Masiello, B. Dugan, W. Hockaday, M.R. Dean, K. Zygourakis, R.T. Barnes, Hydrologic properties of biochars produced at different temperatures, Biomass and Bioenergy, 34-43, 2012.
  26. D. Li, W. Hockaday, C.A. Masiello, P.M. Alvarez, Earthworm avoidance of biochar can be mitigated by wetting, Soil Biology and Biochemistry, 43, 1732-1737, 2011.
  27. J. Lehmann, M. Rillig, J. Thies, C.A. Masiello, W. Hockaday, Biochar effects on soil biota – a review, Soil Biology and Biochemistry, 43, 1812-1836, 2011.
  28. M. Gallagher, W. Hockaday, C. Masiello, S. Snapp, C. McSweeney, J. Baldock, Biochemical Suitability of crop residues for cellulosic ethanol: Disincentives to nitrogen fertilization in corn agriculture, Environmental Science & Technology, 45, 2013 – 2020, 2011.
  29. F.-W. Zeng, C. Masiello, W. Hockaday, Controls on the cycling of dissolved inorganic carbon in the Brazos River, Texas, Biogeochemistry, 104, 275-291, 2011.
  30. E. Kane*, W. Hockaday*, C. Masiello, M. Turetsky, Topographic controls on black carbon accumulation in Alaskan black spruce forest soils: implications for organic matter dynamics. Biogeochemistry, 100, 39-56, 2010. * authors contributed equally
  31. B. Nguyen, J. Lehmann, S. Joseph, W. Hockaday, C. Masiello, Temperature sensitivity of black carbon decomposition, Environmental Science & Technology, 44, 3324-3331, 2010.
  32. K. Schreiner, T. Filley, R. Blanchette, B. Bowen, R. Bolskar, W. Hockaday, and C. Masiello, White rot basidomycete-mediated decomposition of C60 fullerol, Environmental Science &Technology, 43, 3162-3168, 2009.
  33. W. Hockaday, C. Masiello, R. Smernik, J. Baldock, O. Chadwick, and J. Harden, The measurement of soil carbon oxidation state by 13C nuclear magnetic resonance, Journal of Geophysical Research-Biogeosciences, 114, G02014, doi.10.1029/2008jg000803, May 2009.
  34. W. Hockaday, J. Purcell, J. Baldock, P. Hatcher, Electrospray and photo-ionization mass spectrometry for the characterization of organic matter in natural waters: A qualitative assessment, Limnology and Oceanography: Methods, 7, 81-95, 2009.
  35. J. Fernández, W. Hockaday, C. Plaza, A. Polo, P. Hatcher, Effects of long-term soil amendment with sewage sludges on soil humic acid thermal and molecular properties, Chemosphere, 2008. Doi:10.1016/j.chemosphere.2008208.001
  36. W. Hockaday, A. Grannas, S. Kim, P. Hatcher, The transformation and mobility of charcoal black carbon in a fire-impacted watershed, Geochimica et. Cosmochimica Acta. 71, 3432-3445, 2007.
  37. K. Hammes, M. Schmidt, and 40 other authors including W. Hockaday, Comparison of quantification methods to measure fire-derived (black/elemental) carbon in soils and sediments using reference materials from soil, water, sediment, and the atmosphere, Global Biogeochemical Cycles. 21, GB3016, 2007.
  38. A. Grannas, W. Hockaday, P. Hatcher, L. Thompson, E. Mosley-Thompson, Newrevelations on the nature of water-soluble organic matter preserved in ice cores, Journal of Geophysical Research-Atmospheres, 111, D04304, 2006.
  39. W. Hockaday, S. Kim, A. Grannas, P. Hatcher, Direct molecular-level evidence for the degradation of black carbon in soils from ultrahigh resolution mass spectral analysis of dissolved organic matter from a fire impacted forest soil, Organic Geochemistry, 37, 501-510, 2006.
  40. P. Trompowsky, V. Benites, A. Pimenta, B. Madari, W. Hockaday, P. Hatcher, Characterization of humic-like substances obtained by chemical oxidation of eucalyptus charcoal, Organic Geochemistry, 36, 1480-1489, 2005.