This digital collection includes articles by Eldor A. Paul, a Senior Research Scientist at the Natural Resource Ecology Laboratory and a Professor in the Department of Soil and Crop Sciences at Colorado State University, Fort Collins. Eldor has had a lifelong interest in teaching and research in both grassland ecology and agroecosystems, ranging from wheat fields in Canada, through corn-belt rotations in the Great Lakes region of the US, into the afforested systems in California and Colorado.

Recent Submissions

  • Biological and molecular structure analyses of the controls on soil organic matter dynamics 

    Author(s):Magrini, K.; Follett, R. F.; Conant, R.; Paul, Eldor A.; Morris, S. J.
    Date Issued:2008-09
    Format:born digital; articles
    The dynamics of soil organic carbon (SOC) are controlled by the interaction of biological, physical, and chemical parameters. These are best measured by a combination of techniques such as long-term field sites with a C3↔C4 ...
  • Agriculture's role in greenhouse gas mitigation 

    Author(s):Paul, Eldor A.; Sheehan, John; Antle, John M.; Paustian, Keith
    Date Issued:2006-09
    Format:born digital; articles
    This report describes opportunities for U.S. agriculture to contribute to reducing net greenhouse gas emissions. The Pew Center on Global Climate Change was established by the Pew Charitable Trusts to bring a new cooperative ...
  • Analytical determination of concentric carbon gradients within stable soil aggregates = Détermination analytique de gradients concentriques de carbone au sein d’agrégats stables de sol 

    Author(s):Paul, Eldor A.; Smucker, Alvin J. M.
    Date Issued:1998-08
    Format:born digital; articles
    Soil aggregation dynamics directly control agricultural production and reduce environmental contamination by convection-dispersion sequestrations of most ions. Greater containment and longer residence times of most plant ...
  • Analytical determination of soil C dynamics = Détermination analytique de la dynamique du carbone du sol 

    Author(s):Haile-Mariam, Shawel; Collins, Harold P.; Paul, Eldor A.
    Date Issued:1998-08
    Format:born digital; articles
    The significance and possible management of soil organic C (SOC) in ecosystem functioning, global change and sustainable agriculture is best determined through a knowledge of its dynamics. This requires analytically ...
  • Extraction and measurement of adenosine triphosphate from marine sediment, The 

    Author(s):Paul, E. A.; Bancroft, K.; Wiebe, W. J.
    Date Issued:1976-05
    Format:born digital; articles
    A technique has been developed, using boiling sodium bicarbonate buffer, to extract adenosine triphosphate (ATP) from marine sediments and has been tested on a variety of sediments, including those with high organic content, ...
  • Automated analysis of 15N and 14C in biological samples 

    Author(s):Paul, Eldor A.; Harris, D.
    Date Issued:1989
    Format:born digital; articles
    An automated method for the simultaneous analysis of total N, total C, 15N and 14C in small plant and soil samples is described. A commercial C-N analyser - continuous flow isotope ratio mass spectrometer (ANCA-MS) has ...
  • Continuous flow isotope ratio mass spectrometry of carbon dioxide trapped as strontium carbonate 

    Author(s):Paul, Eldor A.; Porter, L. K.; Harris, D.
    Date Issued:1997
    Format:born digital; articles
    The isotopic signal provided by differential discrimination against atmospheric carbon dioxide (13CO2) by C3 and C4 plant photosynthetic pathways is being widely used to study the processes of carbon (C) fixation, soil ...
  • Carbon flow in plant microbial associations 

    Author(s):Kucey, R. M. N.; Paul, Eldor A.
    Date Issued:1981-07-24
    Format:born digital; articles
    Measurement of the distribution of the photosynthesis product in the symbiotic association of a legume, a mycorrhizal fungus, and nitrogen-fixing bacteria showed that the fungus incorporated 1 percent of the photosynthesis ...
  • Greenhouse gases in intensive agriculture: contributions of individual gases to the radiative forcing of the atmosphere 

    Author(s):Harwood, Richard R.; Paul, Eldor A.; Robertson, G. Philip
    Date Issued:2000-09-15
    Format:born digital; articles
    Agriculture plays a major role in the global fluxes of the greenhouse gases carbon dioxide, nitrous oxide, and methane. From 1991 to 1999, we measured gas fluxes and other sources of global warming potential (GWP) in cropped ...
  • Acid hydrolysis of easily dispersed and microaggregate-derived silt- and clay-sized fractions to isolate resistant soil organic matter 

    Author(s):Conant, R. T.; Paustian, K.; Paul, Eldor A.; Plante, A. F.; Six, J.
    Date Issued:2006-08
    Format:born digital; articles
    The current paradigm in soil organic matter (SOM) dynamics is that the proportion of biologically resistant SOM will increase when total SOM decreases. Recently, several studies have focused on identifying functional pools ...
  • Comparisons between P-fertilized and mycorrhizal plants 

    Author(s):Paul, Eldor A.; Bethlenfalvay, G. J.; Pacovsky, R. S.
    Date Issued:1986-01
    Format:born digital; articles
    In experimentation with vesicular-arbuscular mycorrhizal (VAM) fungi, the availability of non-VAM control plants of equal size to VAM plants is a fundamental requirement. The purpose of this work was to determine nutrient ...
  • Evaluation of carbon accrual in afforested agricultural soils 

    Author(s):Morris, Sherri J.; Haile-Mariam, Shawel; Bohm, Sven; Paul, Eldor A.
    Date Issued:2007-06
    Format:born digital; articles
    Afforestation of agricultural lands can provide economically and environmentally realistic C storage to mitigate for elevated CO2 until other actions such as reduced fossil fuel use can be taken. Soil carbon sequestration ...
  • Microbial efficiency-matrix stabilization (MEMS) framework integrates plant litter decomposition with soil organic matter stabilization: do labile plant inputs form stable soil organic matter?, The 

    Author(s):Wallenstein, Matthew D.; Denef, Karolien; Boot, Claudia M.; Cotrufo, M. Francesca; Paul, Eldor A.
    Date Issued:2013-04
    Format:born digital; articles
    The decomposition and transformation of above- and below-ground plant detritus (litter) is the main process by which soil organic matter (SOM) is formed. Yet, research on litter decay and SOM formation has been largely ...
  • Visions of a more precise soil biology 

    Author(s):Coleman, D. C.; Paul, Eldor A.; Magid, J.; Kätterer, T.; Kirchmann, H.; Andrén, O.
    Date Issued:2008-04
    Format:born digital; articles
    Soils have often been viewed as a black box. Soil biology is difficult to study with the precision we would wish, due to the presence of considerable soil heterogeneity, a huge diversity of organisms, and a plethora of ...
  • Leaching and mass balance of 15N-labeled urea applied to a Kentucky bluegrass turf 

    Author(s):Rieke, P. E.; Paul, Eldor A.; Branham, B. E.; Miltner, E. D.
    Date Issued:1996-11
    Format:born digital; articles
    The fate of urea applied to Kentucky bluegrass (Poa pratensis L.) turf was studied over a 2-yr period using a combination of intact monolith lysimeters and small plots. Soil type was a Marlette fine sandy loam (fine-loamy, ...
  • Soil organic carbon pool changes following land-use conversions 

    Author(s):Paustian, Keith; Paul, Eldor A.; Morris, Sherri J.; Merck, Roel; Six, Johan; DeGryze, Steven
    Date Issued:2004-07
    Format:born digital; articles
    Carbon (C) can be sequestered in the mineral soil after the conversion of intensively cropped agricultural fields to more extensive land uses such as afforested and natural succession ecosystems. Three land-use treatments ...
  • Sensitivity of organic matter decomposition to warming varies with its quality 

    Author(s):Steinweb, Megan; Six, Johan; Plante, Alain F.; Paul, Eldor A.; Parton, William J.; Haddix, Michelle L.; Drijber, Rhae A.; Conant, Richard T.
    Date Issued:2008-04
    Format:born digital; articles
    The relationship between organic matter (OM) lability and temperature sensitivity is disputed, with recent observations suggesting that responses of relatively more resistant OM to increased temperature could be greater ...
  • Carbon isotope ratios of Great Plains soils and in wheat-fallow systems 

    Author(s):Peterson, G. A.; Lyon, D.; Halvorson, A. D.; Leavitt, S. W.; Paul, Eldor A.; Follett, R. F.
    Date Issued:1997-07
    Format:born digital; articles
    The purposes of this study were to improve knowledge of regional vegetation patterns of C3 and C4 plants in the North American Great Plains and to use δ13C methodology and long-term research sites to determine contributions ...
  • Terrestrial carbon pools: preliminary data from the Corn Belt and Great Plains regions 

    Author(s):Hickman, Michael V.; Turco, Ronald F.; Huggins, David R.; Halvorson, Ardell D.; Lyon, Drew J.; Frye, Wilbur W.; Blevins, Robert L.; Cole, C. Vernon; Paul, Eldor A.; Collins, Harold P.; Paustian, Keith H.; Frey, Serita D.; Monz, Christopher A.; Elliott, Edward T.; Burke, Ingrid C.
    Date Issued:1994
    Format:born digital; articles
    Soil organic matter is recognized as an important component of soil quality (Granatstein & Bezdicek, 1992; Arshad & Coen, 1992). In mineral soils, many properties associated with soil quality, including nutrient mineralization, ...
  • Soil carbon dynamics in corn-based agroecosystems: results from carbon-13 natural abundance 

    Author(s):Paul, Eldor A.; Huggins, D. R.; Dick, W. A.; Christenson, D. R.; Bundy, L. G.; Blevins, R. L.; Collins, H. P.
    Date Issued:1999-05
    Format:born digital; articles
    We used natural 13C abundance in soils to calculate the fate of C4-C inputs in fields cropped to continuous corn (Zea mays L.). Soil samples were collected from eight cultivated and six adjacent, noncultivated sites of the ...

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