Mechanisms of nitrogen transfer in a model clover-ryegrass pasture : a 15N-tracer approach
© The Author(s) 2022.
| Veröffentlicht in: | Plant and soil. - 1998. - 480(2022), 1-2 vom: 01., Seite 369-389 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2022
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| Zugriff auf das übergeordnete Werk: | Plant and soil |
| Schlagworte: | Journal Article 15N-stable isotope probing Clover Nitrogen transfer Soil microbial community |
| Zusammenfassung: | © The Author(s) 2022. Purpose: Nitrogen (N) transfer from white clover (Trifolium repens cv.) to ryegrass (Lolium perenne cv.) has the potential to meet ryegrass N requirements. This study aimed to quantify N transfer in a mixed pasture and investigate the influence of the microbial community and land management on N transfer Methods: Split root 15N-labelling of clover quantified N transfer to ryegrass via exudation, microbial assimilation, decomposition, defoliation and soil biota. Incorporation into the microbial protein pool was determined using compound-specific 15N-stable isotope probing approaches Results: N transfer to ryegrass and soil microbial protein in the model system was relatively small, with one-third arising from root exudation. N transfer to ryegrass increased with no microbial competition but soil microbes also increased N transfer via shoot decomposition. Addition of mycorrhizal fungi did not alter N transfer, due to the source-sink nature of this pathway, whilst weevil grazing on roots decreased microbial N transfer. N transfer was bidirectional, and comparable on a short-term scale Conclusions: N transfer was low in a model young pasture established from soil from a permanent grassland with long-term N fertilisation. Root exudation and decomposition were major N transfer pathways. N transfer was influenced by soil biota (weevils, mycorrhizae) and land management (e.g. grazing). Previous land management and the role of the microbial community in N transfer must be considered when determining the potential for N transfer to ryegrass Supplementary Information: The online version contains supplementary material available at 10.1007/s11104-022-05585-0 |
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| Beschreibung: | Date Revised 12.07.2023 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 0032-079X |
| DOI: | 10.1007/s11104-022-05585-0 |