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Do increases in agricultural yield spare land for nature?

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dc.contributor.author Ewers, Robert Mark en
dc.contributor.author Scharlemann, Jorn P. W. en
dc.contributor.author Balmford, Andrew en
dc.contributor.author Green, Rhys E. en
dc.date.accessioned 2011-02-09T20:03:00Z
dc.date.available 2011-02-09T20:03:00Z
dc.date.issued 2009
dc.identifier.citation Ewers, Robert Mark, Scharlemann, Jorn P. W., Balmford, Andrew, and Green, Rhys E. 2009. "<a href="https://repository.si.edu/handle/10088/11885">Do increases in agricultural yield spare land for nature?</a>." <em>Global Change Biology</em>. 15 (7):1716&ndash;1726. <a href="https://doi.org/10.1111/j.1365-2486.2009.01849.x">https://doi.org/10.1111/j.1365-2486.2009.01849.x</a> en
dc.identifier.issn 1354-1013
dc.identifier.uri http://hdl.handle.net/10088/11885
dc.description.abstract Feeding a rapidly expanding human population will require a large increase in the supply of agricultural products during the coming decades. This may lead to the transformation of many landscapes from natural vegetation cover to agricultural land use, unless increases in crop yields reduce the need for new farmland. Here, we assess the evidence that past increases in agricultural yield have spared land for wild nature.We investigated the relationship between the change in the combined energy yield of the 23 most energetically important food crops over the period 1979 1999 and the change in per capita cropland area for 124 countries over the same period. Per capita area of the 23 staple crops tended to decrease in developing countries where large yield increases occurred. However, this was counteracted by a tendency for the area used to grow crops other than staples to increase in the countries where staple crop yields increased. There remained a weak tendency in developing countries for the per capita area of all cropland to decline as staple crop yield increased, a pattern that was most evident in developing countries with the highest per capita food supplies. In developed countries, there was no evidence that higher staple crop yields were associated with decreases in per capita cropland area. This may be because high agricultural subsidies in developed countries override any land-sparing pattern that might otherwise occur. Declines in the area of natural forest were smaller in countries where the yield of staple crops increased most, when the negative effects of human population increases on forest area were controlled for. Our results show that land-sparing is a weak process that occurs under a limited set of circumstances, but that it can have positive outcomes for the conservation of wild nature. en
dc.relation.ispartof Global Change Biology en
dc.title Do increases in agricultural yield spare land for nature? en
dc.type Journal Article en
dc.identifier.srbnumber 78961
dc.identifier.doi 10.1111/j.1365-2486.2009.01849.x
rft.jtitle Global Change Biology
rft.volume 15
rft.issue 7
rft.spage 1716
rft.epage 1726
dc.description.SIUnit NH-EOL en
dc.description.SIUnit STRI en
dc.citation.spage 1716
dc.citation.epage 1726

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