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Science 30 October 1998:
Vol. 282. no. 5390, pp. 893 - 896
DOI: 10.1126/science.282.5390.893
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Review
Long-Term Agroecosystem Experiments: Assessing Agricultural Sustainability and Global Change
Paul E. Rasmussen,
*
Keith W. T. Goulding,
James R. Brown,
Peter R. Grace,
H. Henry Janzen,
Martin Körschens
Long-term agroecosystem experiments can be defined as
large-scale field experiments more than 20 years old that study crop production, nutrient cycling, and environmental impacts of agriculture. They provide a resource for evaluating biological, biogeochemical, and
environmental dimensions of agricultural sustainability; for predicting
future global changes; and for validating model competence and
performance. A systematic assessment is needed to determine the merits
of all known experiments and to identify any that may exist in tropical
and subtropical environments. The establishment of an international
network to coordinate data collection and link sites would facilitate
more precise prediction of agroecosystem sustainability and future
global change.
P. E. Rasmussen, U.S. Department of Agriculture,
Agricultural Research Service, Columbia Plateau Conservation
Research Center, Pendleton, OR 97801, USA. K. W. T. Goulding, Institute of Arable Crops Research-Rothamsted, Harpenden,
Hertfordshire, AL5 2JQ, UK. J. R. Brown, Department of Soil
and Atmospheric Science, University of Missouri, Columbia, MO 65211, USA. P. R. Grace, CIMMYT-International Maize and Wheat
Improvement Center, Lisboa 27, Apdo Postal 6-641, 06600 Mexico DF,
Mexico. H. H. Janzen, Agriculture and Agri-Food Canada,
Lethbridge, Alberta T1J 4B1, Canada. M. Körschens, Centre for
Environmental Research-Leipzig-Halle, Hallesche Strasse 44, Bad
Lauchstad D-06246, Germany.
*
To whom correspondence should be addressed. E-mail:
paul.rasmussen{at}orst.edu
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