Cited by 1,358Soil Carbon and Nitrogen DynamicsSustainable Agricultural Systems AnalysisLand Use and Ecosystem Services

Greenhouse Gases in Intensive Agriculture: Contributions of Individual Gases to the Radiative Forcing of the Atmosphere

Open access
Robertson, G. Philip, Paul, Eldor A., Harwood, Richard R.·2000·Science

Abstract

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 and nearby unmanaged ecosystems. Net GWP (grams of carbon dioxide equivalents per square meter per year) ranged from 110 in our conventional tillage systems to −211 in early successional communities. None of the annual cropping systems provided net mitigation, although soil carbon accumulation in no-till systems came closest to mitigating all other sources of GWP. In all but one ecosystem, nitrous oxide production was the single greatest source of GWP. In the late successional system, GWP was neutral because of significant methane oxidation. These results suggest additional opportunities for lessening the GWP of agronomic systems.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1126/science.289.5486.1922

Cites

10 of 10 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Rotations of annual and perennial crops are common and the diversity of individual crops will affect greenhouse-gas fluxes of the cropping system.

    “Rotations of annual and perennial crops are common and the diversity of individual crops will affect GHG fluxes of the cropping system (Robertson et al. 2000).”

    From LIFE-CYCLE ASSESSMENT OF NET GREENHOUSE-GAS FLUX FOR BIOENERGY CROPPING SYSTEMS (2007) · cites this paper as Robertson et al. 2000

    The supplied passages (labeled Abstract; page not supplied) report different N₂O fluxes for alfalfa and poplar, supporting the point that crop choice can affect greenhouse-gas fluxes. But the paper studies a corn–soybean–wheat rotation and separate perennial crop systems; it does not say that rotations mixing annual and perennial crops are common or measure the effect of diversity within such rotations. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Data from soybean and alfalfa cropping in Canada and Michigan suggest that IPCC (2000) methodology overestimates N2O emissions from N fixers.

    “Data from soybean and alfalfa cropping in Canada (Rochette et al. 2004) and Michigan (Robertson et al. 2000) suggest that IPCC (2000) methodology overestimates N2O emissions from N fixers.”

    From LIFE-CYCLE ASSESSMENT OF NET GREENHOUSE-GAS FLUX FOR BIOENERGY CROPPING SYSTEMS (2007) · cites this paper as Robertson et al. 2000

    The paper reports N₂O measurements from soybean rotations and alfalfa in the Midwest United States, and says alfalfa fluxes were equivalent to those from annual crops. Our copy mentions IPCC methodology, but the relevant passage is garbled and does not establish that it overestimates emissions from nitrogen-fixing crops. The Canada data are attributed to a different citation in the citing sentence. (LLM, conf=0.78)

    Experimental — accuracy not yet measured
  • In a nine year study in Michigan, United States, five to six times smaller N2O emissions were measured for a poplar plantation compared with conventional cropland systems.

    “In a nine year study in Michigan, United States, five to six times smaller N 2 O emissions were measured for a poplar plantation compared with conventional cropland systems (Robertson et al., 2000).”
  • The major sources of greenhouse-gas fluxes associated with crop production are soil nitrous oxide emissions, soil CO2 and methane fluxes, and CO2 emissions associated with agricultural inputs and farm equipment operation.

    “The major sources of GHG fluxes associated with crop production are soil nitrous oxide (N2O) emissions, soil CO2 and methane (CH4) fluxes, and CO2 emissions associated with agricultural inputs and farm equipment operation (Robertson et al. 2000, Del Grosso et al. 2001 a , West and Marland 2002).”

    From LIFE-CYCLE ASSESSMENT OF NET GREENHOUSE-GAS FLUX FOR BIOENERGY CROPPING SYSTEMS (2007) · cites this paper as Robertson et al. 2000

  • Perennials sequester much more carbon in soil.

    “and, importantly, to sequester much more carbon in soil (Robertson et al., 2000;Kardol and Wardle, 2010).”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 6

  1. M. Prather et al., in Climate Change 1994, J. T. Houghton et al., Eds. (Cambridge Univ. Press, New York, 1995), pp. 73-126.
  2. K. Paustian, G. P. Robertson, E. T. Elliott, in Soil Management and the Greenhouse Effect, Advances in Soil Science, R. Lal, J. Kimble, E. Levine, B. A. Stewart, Eds. (CRC Press, Boca Raton, FL, 1995), pp. 69-84.
  3. L. E. Drinkwater, P. Wagoner, M. Sarrantonio, Nature 396, 262 (1998).
  4. A. R. Mosier, D. Schimel, D. Valetine, K. Bronson, W. Parton, Nature 350, 330 (1991).
  5. K. A. Smith, G. P. Robertson, J. M. Melillo, in Global Atmospheric-Biospheric Chemistry, R. Prinn, Ed. (Ple- num, New York, 1994), pp. 179-204.
  6. W. H. Schlesinger, Science 284, 2095 (1999).

Cited by

Sorted by citations

Authors
Robertson, G. P., Paul, E. A., & Harwood, R. R.
Affiliations
Michigan State University (US)
Corresponding author
Robertson, G. Philip
Venue
Science
Published
2000-09-15
Volume
289
Issue
5486
Pages
1922-1925
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W2156101426
Cited by
1,358
References
10
Citations by year
2026: 18 · 2025: 31 · 2024: 31 · 2023: 33 · 2022: 46 · 2021: 55 · 2020: 63 · 2019: 41 · 2018: 51 · 2017: 63 · 2016: 76 · 2015: 72 · 2014: 66 · 2013: 76 · 2012: 85
FWCI
89.29
Type
journal article
Language
en
Open access
Locations
  • Science (publishedVersion)
  • PubMed (publishedVersion)
  • Digital Collections of Colorado (Colorado State University) (submittedVersion)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Sustainable Agricultural Systems Analysis
  • Physical Sciences › Environmental Science › Global and Planetary Change › Land Use and Ecosystem Services
Keywords
greenhouse gases, radiative forcing, global warming potential, nitrous oxide, methane, carbon dioxide, agricultural emissions, soil carbon accumulation, no-tillage, conventional tillage, early successional communities, late-successional forest, methane oxidation, greenhouse gas emissions reduction

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review