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Title
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Phosphorus addition increased carbon partitioning to autotrophic respiration but not to biomass production in an experiment with Zea mays
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Author
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Abstract
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| Plant carbon (C) partitioning ‐ the relative use of photosynthates for biomass production, respiration, and other plant functions ‐ is a key but poorly understood ecosystem process. In an experiment with Zea mays , with or without arbuscular mycorrhizal fungi (AMF), we investigated the effect of phosphorus (P) fertilization and AMF on plant C partitioning. Based on earlier studies, we expected C partitioning to biomass production (i.e., biomass production efficiency; BPE) to increase with increasing P addition due to reduced C partitioning to AMF. However, although plant growth was clearly stimulated by P addition, BPE did not increase. Instead, C partitioning to autotrophic respiration increased. These results contrasted with our expectations and with a previous experiment in the same set‐up where P addition increased BPE while no effect on autotropic respiration was found. The comparison of both experiments suggests a key role for AMF in explaining these contrasts. Whereas in the previous experiment substantial C partitioning to AMF reduced BPE under low P, in the current experiment, C partitioning to AMF was too low to directly influence BPE. Our results illustrate the complex influence of nutrient availability and mycorrhizal symbiosis on plant C partitioning. |
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Language
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English
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Source (journal)
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Plant, cell and environment. - Oxford, 1978, currens
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Publication
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Hoboken
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Wiley
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2020
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ISSN
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0140-7791
[print]
1365-3040
[online]
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DOI
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10.1111/PCE.13785
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Volume/pages
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43
:9
(2020)
, p. 2054-2065
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ISI
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000537124600001
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Pubmed ID
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32400909
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Full text (Publisher's DOI)
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Full text (open access)
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Full text (publisher's version - intranet only)
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