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| Titel |
Rapid transfer of photosynthetic carbon through the plant-soil system in differently managed species-rich grasslands |
| VerfasserIn |
G. B. Deyn, H. Quirk, S. Oakley, N. Ostle, R. D. Bardgett |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 5 ; Nr. 8, no. 5 (2011-05-13), S.1131-1139 |
| Datensatznummer |
250005811
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| Publikation (Nr.) |
 copernicus.org/bg-8-1131-2011.pdf |
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| Zusammenfassung |
| Plant-soil interactions are central to short-term carbon (C) cycling through
the rapid transfer of recently assimilated C from plant roots to soil biota.
In grassland ecosystems, changes in C cycling are likely to be influenced by
land use and management that changes vegetation and the associated soil
microbial communities. Here we tested whether changes in grassland
vegetation composition resulting from management for plant diversity
influences short-term rates of C assimilation and transfer from plants to
soil microbes. To do this, we used an in situ 13C-CO2 pulse-labelling approach to measure differential C uptake among different
plant species and the transfer of the plant-derived 13C to key groups
of soil microbiota across selected treatments of a long-term plant diversity
grassland restoration experiment. Results showed that plant taxa differed
markedly in the rate of 13C assimilation and concentration: uptake was
greatest and 13C concentration declined fastest in Ranunculus repens, and assimilation
was least and 13C signature remained longest in mosses. Incorporation
of recent plant-derived 13C was maximal in all microbial phosopholipid
fatty acid (PLFA) markers at 24 h after labelling. The greatest incorporation
of 13C was in the PLFA 16:1ω5, a marker for arbuscular
mycorrhizal fungi (AMF), while after 1 week most 13C was retained in
the PLFA18:2ω6,9 which is indicative of assimilation of
plant-derived 13C by saprophytic fungi. Our results of 13C
assimilation and transfer within plant species and soil microbes were
consistent across management treatments. Overall, our findings suggest that
plant diversity restoration management may not directly affect the C
assimilation or retention of C by individual plant taxa or groups of soil
microbes, it can impact on the fate of recent C by changing their relative
abundances in the plant-soil system. Moreover, across all treatments we
found that plant-derived C is rapidly transferred specifically to AMF and
decomposer fungi, indicating their consistent key role in the cycling of
recent plant derived C. |
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