The impact of water erosion on global maize and wheat productivity

17449 10 95351 3 293766 document 95351 erosion_impact_final.pdf application/pdf e70f077088c72420560ee4ada0e78eda MD5 1736449 2021-09-28 10:52:27 https://pure.iiasa.ac.at/id/eprint/17449/1/erosion_impact_final.pdf 17449 1 1 application/pdf text en public cc_by_nc_nd_4

erosion_impact_final.pdf

2023-09-28 accepted 95352 2 293770 document 95352 lightbox.jpg image/png 3f6345ff0fb3caceeb413f42a6e16e4c MD5 39076 2021-09-28 11:02:46 https://pure.iiasa.ac.at/id/eprint/17449/2/lightbox.jpg 17449 2 2 image/png other Thumbnails conversion from text to thumbnail_lightbox en staffonly

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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/95351 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/95351 http://eprints.org/relation/isIndexCodesVersionOf https://pure.iiasa.ac.at/id/document/95351 archive 353 disk0/00/01/74/49 2021-09-28 07:52:16 2023-09-28 03:00:03 2021-09-28 07:52:16 article show Carr T.W. Balkovič J. 1977 0000-0003-2955-4931 Dodds P.E. Folberth C. 2033 0000-0002-6738-5238 Skalský R. 1986 0000-0002-0983-6897 The impact of water erosion on global maize and wheat productivity pub BNR AFE Water erosion; Crop production change; Global-gridded crop model; EPIC; Fertilizer replacement costs Water erosion removes soil nutrients, soil carbon, and in extreme cases can remove topsoil altogether. Previous studies have quantified crop yield losses from water erosion using a range of methods, applied mostly to single plots or fields, and cannot be systematically compared. This study assesses the worldwide impact of water erosion on maize and wheat production using a global gridded modeling approach for the first time. The EPIC crop model is used to simulate the global impact of water erosion on maize and wheat yields, from 1980 to 2010, for a range of field management strategies. Maize and wheat yields were reduced by a median of 3% annually in grid cells affected by water erosion, which represent approximately half of global maize and wheat cultivation areas. Water erosion reduces the annual global production of maize and wheat by 8.9 million tonnes and 5.6 million tonnes, with a value of $3.3bn globally. Nitrogen fertilizer necessary to reduce losses is valued at $0.9bn. As cropland most affected by water erosion is outside major maize and wheat production regions, the production losses account for less than 1% of the annual global production by volume. Countries with heavy rainfall, hilly agricultural regions and low fertilizer use are most vulnerable to water erosion. These characteristics are most common in South and Southeast Asia, sub-Saharan Africa and South and Central America. Notable uncertainties remain around large-scale water erosion estimates that will need to be addressed by better integration of models and observations. Yet, an integrated bio-physical modeling framework – considering plant growth, soil processes and input requirements – as presented herein can provide a link between robust water erosion estimates, economics and policy-making so far lacking in global agricultural assessments. 2021-12-01 published Elsevier 10.1016/j.agee.2021.107655 23 92 287 public Agriculture, Ecosystems & Environment 322 e107655 TRUE 1873-2305 Observation-based system for monitoring and verification of greenhouse gases (VERIFY, H2020 776810) Coordination of International Research Cooperation on soil CArbon Sequestration in Agriculture (CIRCASA, H2020 774378) yes info:eu-repo/grantAgreement/EC/H2020/776810/EU//VERIFY; Coordination of International Research Cooperation on soil CArbon Sequestration in Agriculture (CIRCASA, H2020 774378) info:eu-repo/semantics/article info:eu-repo/semantics/embargoedAccess