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Does nitrogen transfer between plants confound N-15-based quantifications of N-2 fixation?
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- Carlsson, Georg (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för norrländsk jordbruksvetenskap,Biosystem och teknologi,Department of Agricultural Research for Northern Sweden,Department of Biosystems and Technology
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- Huss-Danell, Kerstin (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för norrländsk jordbruksvetenskap,Department of Agricultural Research for Northern Sweden
- (creator_code:org_t)
- 2013-09-05
- 2014
- English.
- In: Plant and Soil. - : Springer Science and Business Media LLC. - 0032-079X .- 1573-5036. ; 374, s. 345-358
- Journal article (peer-reviewed)
Abstract
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- Transfer of fixed N from legumes to non-legume reference plants may alter the N-15 signature of the reference plant as compared to the soil N available to the legume. This study investigates how N transfer influences the result of N-15-based N-2 fixation measurements.We labelled either legumes or non-legumes with N-15 and performed detailed analyses of N-15 enrichment in mixed plant communities in the field. The results were used in a conceptual model comparing how different N transfer scenarios influenced the N-15 signatures of legumes and reference plants, and how the resulting N-2 fixation estimate was influenced by using reference plants in pure stand or in mixture with the legume.Based on isotopic signatures, N transfer was detected in all directions: from legume to legume, from legume to non-legume, from non-legume to legume, from non-legume to non-legume. In the scenario of multidirectional N transfer, N-2 fixation was overestimated by using a reference plant in pure stand.Fixed N transferred to neighbouring reference plants modifies the N-15 signature of the soil N available both to the reference plant and the N-2-fixing legume. This provides strong support for using reference plants growing in mixture with the legumes for reliable quantifications of N-2 fixation.
Subject headings
- LANTBRUKSVETENSKAPER -- Annan lantbruksvetenskap -- Övrig annan lantbruksvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Other Agricultural Sciences -- Other Agricultural Sciences not elsewhere specified (hsv//eng)
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
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