A Modelling Approach to Global Nitrate Leaching Caused by Anthropogenic Fertilisation
Identifieur interne : 001069 ( Main/Curation ); précédent : 001068; suivant : 001070A Modelling Approach to Global Nitrate Leaching Caused by Anthropogenic Fertilisation
Auteurs : Bin-Le Lin [Japon] ; A. Sakoda [Japon] ; R. Shibasaki [Japon] ; M. Suzuki [Japon]Source :
- Water Research [ 0043-1354 ] ; 2001.
Abstract
Water quality associated with nitrate (NO3−) leaching from agricultural soils is an important environmental issue. This paper describes a new modelling approach to quantitatively evaluate the effect of the use of fertilisers on global nitrate leaching. A global process-based simulation model was previously developed for the nitrogen cycle in terrestrial ecosystems, in which soil inorganic nitrogen in the form of ammonium (NH4+) and NO3− was considered. After introducing data on world fertiliser consumption (FAO, 1995) into the steady-state model, the extent of disturbance to the nitrogen cycle caused by fertilisation was calculated. Although fertilisation resulted in an annual increase in net primary production (NPP, represented as carbon) of 18 Gtyear−1, NO3− leaching and gaseous losses of nitrogen oxides and ammonia were also accelerated. Most regions with heavy fertiliser application (over 100kgha−1year−1) showed a high annual leaching load equal to or more than 20kgha−1year−1. About 2.5% of the land area occupied by terrestrial ecosystems suffered a serious leaching load of more than 30kgha−1year−1. Of the total amount of applied fertilisers (138Tgyear−1) 19% was lost to NO3− leaching, 8% to gaseous ammonia, and 3% to gaseous nitrogen oxides. The rest was assumed to be fixed in the ecosystems through vegetation uptake.
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DOI: 10.1016/S0043-1354(00)00484-X
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Suzuki</name><affiliation wicri:level="1"><country xml:lang="fr">Japon</country><wicri:regionArea>The United Nations University, 5-53-67, Jingumae, Shibuya-ku, Tokyo 150-8304</wicri:regionArea><placeName><settlement type="city">Tokyo</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Water Research</title><title level="j" type="abbrev">WR</title><idno type="ISSN">0043-1354</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="2001">2001</date><biblScope unit="volume">35</biblScope><biblScope unit="issue">8</biblScope><biblScope unit="page" from="1961">1961</biblScope><biblScope unit="page" to="1968">1968</biblScope></imprint><idno type="ISSN">0043-1354</idno></series><idno type="istex">A8D0566F5B852D6CCCC0C56A17181A53A0C63DAB</idno><idno type="DOI">10.1016/S0043-1354(00)00484-X</idno><idno type="PII">S0043-1354(00)00484-X</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0043-1354</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Water quality associated with nitrate (NO3−) leaching from agricultural soils is an important environmental issue. This paper describes a new modelling approach to quantitatively evaluate the effect of the use of fertilisers on global nitrate leaching. A global process-based simulation model was previously developed for the nitrogen cycle in terrestrial ecosystems, in which soil inorganic nitrogen in the form of ammonium (NH4+) and NO3− was considered. After introducing data on world fertiliser consumption (FAO, 1995) into the steady-state model, the extent of disturbance to the nitrogen cycle caused by fertilisation was calculated. Although fertilisation resulted in an annual increase in net primary production (NPP, represented as carbon) of 18 Gtyear−1, NO3− leaching and gaseous losses of nitrogen oxides and ammonia were also accelerated. Most regions with heavy fertiliser application (over 100kgha−1year−1) showed a high annual leaching load equal to or more than 20kgha−1year−1. About 2.5% of the land area occupied by terrestrial ecosystems suffered a serious leaching load of more than 30kgha−1year−1. Of the total amount of applied fertilisers (138Tgyear−1) 19% was lost to NO3− leaching, 8% to gaseous ammonia, and 3% to gaseous nitrogen oxides. The rest was assumed to be fixed in the ecosystems through vegetation uptake.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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