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Ecosystem C and N dynamics affected by a modified spring barley trait with increased nitrogen use - a simulation case study
Department of Crop Production Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
Department of Soil and Environment, Swedish University of Agricultural Sciences, Uppsala, Sweden.
Högskolan i Gävle, Akademin för utbildning och ekonomi, Avdelningen för ekonomi, Nationalekonomi. Department of Soil and Environment, Swedish University of Agricultural Sciences, Uppsala, Sweden.
Department of Soil and Environment, Swedish University of Agricultural Sciences, Uppsala, Sweden.
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2018 (Engelska)Ingår i: Acta Agriculturae Scandinavica - Section B, ISSN 0906-4710, E-ISSN 1651-1913, Vol. 68, nr 3, s. 230-242Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

To what extent might a crop with increased plant N uptake efficiency and/or N demand increase plant biomass and soil carbon storage, decrease N leaching, and reduce the need for N fertilisation? This was assessed for a fertilised sandy loam site in central Sweden cultivated with spring barley for a four year period using a process based crop and soil simulation model (SOILN) calibrated to fit observations of field experiments with non-modified crops. Crop properties were changed in accordance with previous model applications to other crops with higher N uptake and utilisation efficiencies, to resemble potential effects of breeding. For the modified crops a doubling of daily uptake efficiency of soil mineral N and/or increase of radiation use efficiency by 30%, increased plant biomass by 3%-30%, decreased N leaching by 1%-30% and increased soil organic carbon (SOC) content by 1-12 g C m-2 year-1. The larger changes were mainly due to increased uptake efficiency. Fertilisation of the modified spring barley crop could be reduced while still producing the same plant biomass as the non-modified crop. The plant biomass to N leaching ratio of the modified crops increased. The simulated changes in plant biomass and SOC were sensitive to weather conditions suggesting that in situ experiments would need to cover a large range of weather conditions to evaluate the performance of new crop traits under climatic variability. The study suggests a strong need that field experiments are accompanied with model applications, when exploring the potential of the modified crops under variable conditions.

Ort, förlag, år, upplaga, sidor
Taylor & Francis , 2018. Vol. 68, nr 3, s. 230-242
Nyckelord [en]
Plant breeding; N uptake; N utilisation; N leaching; SOC; sandy loam; Sweden
Nationell ämneskategori
Nationalekonomi Ekologi
Identifikatorer
URN: urn:nbn:se:hig:diva-25408DOI: 10.1080/09064710.2017.1385835ISI: 000427196000005Scopus ID: 2-s2.0-85030850140OAI: oai:DiVA.org:hig-25408DiVA, id: diva2:1149583
Forskningsfinansiär
Mistra - Stiftelsen för miljöstrategisk forskning
Anmärkning

Mistra Biotech research programme (Biotechnology for Sustainable and Competitive Agriculture and Food Systems) - Mistra (the Swedish Foundation for Strategic Environmental Research)

Tillgänglig från: 2017-10-16 Skapad: 2017-10-16 Senast uppdaterad: 2018-04-03Bibliografiskt granskad

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Collentine, Dennis

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