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Temporal patterns of carbon flow from grassland vegetation to soil microorganisms measured using 13C-labelling and signature fatty acids

Birgander, Johanna LU and Olsson, Pål Axel LU (2021) In Plant and Soil
Abstract

Purpose: We investigated how the C flow from plants to microorganisms varies throughout the year in a temperate grassland. Additionally, we investigated how the C flow relates to saprotrophic activity and vegetation changes. Methods: In situ stable isotope pulse labelling (13CO2) was employed to estimate the flow of recently plant-derived C to soil microorganisms by using signature fatty acids. Bacterial and fungal growth was estimated using radio-labelling in laboratory incubations. Results: The C flow from plants to arbuscular mycorrhizal (AM) fungi peaked during the warmer parts of the year, but saprotrophic microorganisms showed little temporal variation in C flow. Also saprotrophic fungi received considerable... (More)

Purpose: We investigated how the C flow from plants to microorganisms varies throughout the year in a temperate grassland. Additionally, we investigated how the C flow relates to saprotrophic activity and vegetation changes. Methods: In situ stable isotope pulse labelling (13CO2) was employed to estimate the flow of recently plant-derived C to soil microorganisms by using signature fatty acids. Bacterial and fungal growth was estimated using radio-labelling in laboratory incubations. Results: The C flow from plants to arbuscular mycorrhizal (AM) fungi peaked during the warmer parts of the year, but saprotrophic microorganisms showed little temporal variation in C flow. Also saprotrophic fungi received considerable amounts of C from plants throughout the year. Bacterial and fungal growth showed temporal variation with a growth peak in August for both. This suggests a shift in the C source from mainly rhizosphere C in colder parts of the year, to older C-sources in warmer parts of the year (August). Conclusion: We conclude that AM fungi, saprotrophic fungi and bacteria differ in the amount of recently-fixed C they receive from plants throughout the year. Hence, temporal patterns need to be considered to understand ecosystem functioning. The studied plant community included winter annuals, which potentially maintain a high C flow to saprotrophic fungi during the cold season.

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publication status
epub
subject
keywords
Arbuscular mycorrhiza (AM), Fatty acids, PLFA, C, Rhizosphere, Season, Temporal patterns
in
Plant and Soil
publisher
Springer
external identifiers
  • scopus:85100797734
ISSN
0032-079X
DOI
10.1007/s11104-021-04854-8
language
English
LU publication?
yes
id
e6aba19b-2006-4702-bce8-510edb201692
date added to LUP
2021-03-03 08:14:13
date last changed
2021-03-03 08:14:13
@article{e6aba19b-2006-4702-bce8-510edb201692,
  abstract     = {<p>Purpose: We investigated how the C flow from plants to microorganisms varies throughout the year in a temperate grassland. Additionally, we investigated how the C flow relates to saprotrophic activity and vegetation changes. Methods: In situ stable isotope pulse labelling (<sup>13</sup>CO<sub>2</sub>) was employed to estimate the flow of recently plant-derived C to soil microorganisms by using signature fatty acids. Bacterial and fungal growth was estimated using radio-labelling in laboratory incubations. Results: The C flow from plants to arbuscular mycorrhizal (AM) fungi peaked during the warmer parts of the year, but saprotrophic microorganisms showed little temporal variation in C flow. Also saprotrophic fungi received considerable amounts of C from plants throughout the year. Bacterial and fungal growth showed temporal variation with a growth peak in August for both. This suggests a shift in the C source from mainly rhizosphere C in colder parts of the year, to older C-sources in warmer parts of the year (August). Conclusion: We conclude that AM fungi, saprotrophic fungi and bacteria differ in the amount of recently-fixed C they receive from plants throughout the year. Hence, temporal patterns need to be considered to understand ecosystem functioning. The studied plant community included winter annuals, which potentially maintain a high C flow to saprotrophic fungi during the cold season.</p>},
  author       = {Birgander, Johanna and Olsson, Pål Axel},
  issn         = {0032-079X},
  language     = {eng},
  month        = {02},
  publisher    = {Springer},
  series       = {Plant and Soil},
  title        = {Temporal patterns of carbon flow from grassland vegetation to soil microorganisms measured using 13C-labelling and signature fatty acids},
  url          = {http://dx.doi.org/10.1007/s11104-021-04854-8},
  doi          = {10.1007/s11104-021-04854-8},
  year         = {2021},
}