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Drought decreases incorporation of recent plant photosynthate into soil food webs regardless of their trophic complexity

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Drought decreases incorporation of recent plant photosynthate into soil food webs regardless of their trophic complexity. / Chomel, Mathilde; Lavallee, Jocelyn M.; Alvarez‐segura, Nil et al.
In: Global Change Biology, Vol. 25, No. 10, 31.10.2019, p. 3549-3561.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Chomel, M, Lavallee, JM, Alvarez‐segura, N, De Castro, F, Rhymes, JM, Caruso, T, De Vries, FT, Baggs, EM, Emmerson, MC, Bardgett, RD & Johnson, D 2019, 'Drought decreases incorporation of recent plant photosynthate into soil food webs regardless of their trophic complexity', Global Change Biology, vol. 25, no. 10, pp. 3549-3561. https://doi.org/10.1111/gcb.14754

APA

Chomel, M., Lavallee, J. M., Alvarez‐segura, N., De Castro, F., Rhymes, J. M., Caruso, T., De Vries, F. T., Baggs, E. M., Emmerson, M. C., Bardgett, R. D., & Johnson, D. (2019). Drought decreases incorporation of recent plant photosynthate into soil food webs regardless of their trophic complexity. Global Change Biology, 25(10), 3549-3561. https://doi.org/10.1111/gcb.14754

Vancouver

Chomel M, Lavallee JM, Alvarez‐segura N, De Castro F, Rhymes JM, Caruso T et al. Drought decreases incorporation of recent plant photosynthate into soil food webs regardless of their trophic complexity. Global Change Biology. 2019 Oct 31;25(10):3549-3561. Epub 2019 Aug 10. doi: 10.1111/gcb.14754

Author

Chomel, Mathilde ; Lavallee, Jocelyn M. ; Alvarez‐segura, Nil et al. / Drought decreases incorporation of recent plant photosynthate into soil food webs regardless of their trophic complexity. In: Global Change Biology. 2019 ; Vol. 25, No. 10. pp. 3549-3561.

Bibtex

@article{6519e1efa9544ab9abb4f08d4f2d071b,
title = "Drought decreases incorporation of recent plant photosynthate into soil food webs regardless of their trophic complexity",
abstract = "Theory suggests that more complex food webs promote stability and can buffer the effects of perturbations, such as drought, on soil organisms and ecosystem functions. Here, we tested experimentally how soil food web trophic complexity modulates the response to drought of soil functions related to carbon cycling and the capture and transfer below-ground of recent photosynthate by plants. We constructed experimental systems comprising soil communities with one, two or three trophic levels (microorganisms, detritivores and predators) and subjected them to drought. We investigated how food web trophic complexity in interaction with drought influenced litter decomposition, soil CO 2 efflux, mycorrhizal colonization, fungal production, microbial communities and soil fauna biomass. Plants were pulse-labelled after the drought with 13 C-CO 2 to quantify the capture of recent photosynthate and its transfer below-ground. Overall, our results show that drought and soil food web trophic complexity do not interact to affect soil functions and microbial community composition, but act independently, with an overall stronger effect of drought. After drought, the net uptake of 13 C by plants was reduced and its retention in plant biomass was greater, leading to a strong decrease in carbon transfer below-ground. Although food web trophic complexity influenced the biomass of Collembola and fungal hyphal length, 13 C enrichment and the net transfer of carbon from plant shoots to microbes and soil CO 2 efflux were not affected significantly by varying the number of trophic groups. Our results indicate that drought has a strong effect on above-ground-below-ground linkages by reducing the flow of recent photosynthate. Our results emphasize the sensitivity of the critical pathway of recent photosynthate transfer from plants to soil organisms to a drought perturbation, and show that these effects may not be mitigated by the trophic complexity of soil communities, at least at the level manipulated in this experiment. ",
keywords = "plant-soil interaction, pulse-labelling, root-derived C, Collembola, Acari, microorganisms, soil biodiversity, stable isotope",
author = "Mathilde Chomel and Lavallee, {Jocelyn M.} and Nil Alvarez‐segura and {De Castro}, Francisco and Rhymes, {Jennifer M.} and Tancredi Caruso and {De Vries}, {Franciska T.} and Baggs, {Elizabeth M.} and Emmerson, {Mark C.} and Bardgett, {Richard D.} and David Johnson",
year = "2019",
month = oct,
day = "31",
doi = "10.1111/gcb.14754",
language = "English",
volume = "25",
pages = "3549--3561",
journal = "Global Change Biology",
issn = "1354-1013",
publisher = "Blackwell Publishing Ltd",
number = "10",

}

RIS

TY - JOUR

T1 - Drought decreases incorporation of recent plant photosynthate into soil food webs regardless of their trophic complexity

AU - Chomel, Mathilde

AU - Lavallee, Jocelyn M.

AU - Alvarez‐segura, Nil

AU - De Castro, Francisco

AU - Rhymes, Jennifer M.

AU - Caruso, Tancredi

AU - De Vries, Franciska T.

AU - Baggs, Elizabeth M.

AU - Emmerson, Mark C.

AU - Bardgett, Richard D.

AU - Johnson, David

PY - 2019/10/31

Y1 - 2019/10/31

N2 - Theory suggests that more complex food webs promote stability and can buffer the effects of perturbations, such as drought, on soil organisms and ecosystem functions. Here, we tested experimentally how soil food web trophic complexity modulates the response to drought of soil functions related to carbon cycling and the capture and transfer below-ground of recent photosynthate by plants. We constructed experimental systems comprising soil communities with one, two or three trophic levels (microorganisms, detritivores and predators) and subjected them to drought. We investigated how food web trophic complexity in interaction with drought influenced litter decomposition, soil CO 2 efflux, mycorrhizal colonization, fungal production, microbial communities and soil fauna biomass. Plants were pulse-labelled after the drought with 13 C-CO 2 to quantify the capture of recent photosynthate and its transfer below-ground. Overall, our results show that drought and soil food web trophic complexity do not interact to affect soil functions and microbial community composition, but act independently, with an overall stronger effect of drought. After drought, the net uptake of 13 C by plants was reduced and its retention in plant biomass was greater, leading to a strong decrease in carbon transfer below-ground. Although food web trophic complexity influenced the biomass of Collembola and fungal hyphal length, 13 C enrichment and the net transfer of carbon from plant shoots to microbes and soil CO 2 efflux were not affected significantly by varying the number of trophic groups. Our results indicate that drought has a strong effect on above-ground-below-ground linkages by reducing the flow of recent photosynthate. Our results emphasize the sensitivity of the critical pathway of recent photosynthate transfer from plants to soil organisms to a drought perturbation, and show that these effects may not be mitigated by the trophic complexity of soil communities, at least at the level manipulated in this experiment.

AB - Theory suggests that more complex food webs promote stability and can buffer the effects of perturbations, such as drought, on soil organisms and ecosystem functions. Here, we tested experimentally how soil food web trophic complexity modulates the response to drought of soil functions related to carbon cycling and the capture and transfer below-ground of recent photosynthate by plants. We constructed experimental systems comprising soil communities with one, two or three trophic levels (microorganisms, detritivores and predators) and subjected them to drought. We investigated how food web trophic complexity in interaction with drought influenced litter decomposition, soil CO 2 efflux, mycorrhizal colonization, fungal production, microbial communities and soil fauna biomass. Plants were pulse-labelled after the drought with 13 C-CO 2 to quantify the capture of recent photosynthate and its transfer below-ground. Overall, our results show that drought and soil food web trophic complexity do not interact to affect soil functions and microbial community composition, but act independently, with an overall stronger effect of drought. After drought, the net uptake of 13 C by plants was reduced and its retention in plant biomass was greater, leading to a strong decrease in carbon transfer below-ground. Although food web trophic complexity influenced the biomass of Collembola and fungal hyphal length, 13 C enrichment and the net transfer of carbon from plant shoots to microbes and soil CO 2 efflux were not affected significantly by varying the number of trophic groups. Our results indicate that drought has a strong effect on above-ground-below-ground linkages by reducing the flow of recent photosynthate. Our results emphasize the sensitivity of the critical pathway of recent photosynthate transfer from plants to soil organisms to a drought perturbation, and show that these effects may not be mitigated by the trophic complexity of soil communities, at least at the level manipulated in this experiment.

KW - plant-soil interaction

KW - pulse-labelling

KW - root-derived C

KW - Collembola

KW - Acari

KW - microorganisms

KW - soil biodiversity

KW - stable isotope

U2 - 10.1111/gcb.14754

DO - 10.1111/gcb.14754

M3 - Journal article

C2 - 31301198

VL - 25

SP - 3549

EP - 3561

JO - Global Change Biology

JF - Global Change Biology

SN - 1354-1013

IS - 10

ER -