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Ecosystem C and N dynamics affected by a modified spring barley trait with increased nitrogen use - a simulation case study
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- Eckersten, Henrik (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för växtproduktionsekologi,Department of Crop Production Ecology,Department of Crop Production Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden
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- Marstorp, Håkan (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment,Department of Soil and Environment, Swedish University of Agricultural Sciences, Uppsala, Sweden
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- Collentine, Dennis (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Högskolan i Gävle,Nationalekonomi,Department of Soil and Environment, Swedish University of Agricultural Sciences, Uppsala, Sweden,Institutionen för mark och miljö,University of Gävle
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- (creator_code:org_t)
- 2017-10-09
- 2018
- English.
- In: Acta Agriculturae Scandinavica - Section B. - : Taylor & Francis. - 0906-4710 .- 1651-1913. ; 68:3, s. 230-242
- Journal article (peer-reviewed)
Abstract
Subject headings
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- 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.
Subject headings
- SAMHÄLLSVETENSKAP -- Ekonomi och näringsliv -- Nationalekonomi (hsv//swe)
- SOCIAL SCIENCES -- Economics and Business -- Economics (hsv//eng)
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Jordbruksvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Agricultural Science (hsv//eng)
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Markvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Soil Science (hsv//eng)
Keyword
- Plant breeding; N uptake; N utilisation; N leaching; SOC; sandy loam; Sweden
Publication and Content Type
- ref (subject category)
- art (subject category)
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- SOCIAL SCIENCES
- and Economics and Bu ...
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- and Biological Scien ...
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