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Seasonality alters drivers of soil enzyme activity in subalpine grassland soil undergoing climate change

Seasonality alters drivers of soil enzyme activity in subalpine grassland soil undergoing climate change
Seasonality alters drivers of soil enzyme activity in subalpine grassland soil undergoing climate change
In mountain ecosystems with marked seasonality, climate change can affect various processes in soils, potentially modifying long-term key soil services via change in soil organic carbon (C) storage. Based on a four-year soil transplantation experiment in Swiss subalpine grasslands, we investigated how imposed climate warming and reduced precipitation modified the drivers of soil carbon enzyme potential activities across winter and summer seasons. Specifically, we used structural equation models (SEMs) to identify biotic (microbial community structure, abundance and activity) and abiotic (quantity and quality of organic matter resources) drivers of soil C-enzymes (hydrolase and oxidase) in two seasons under two different climate scenarios. We found contrasting impacts of the climate manipulation on the drivers of C-enzymes between winter and summer. In winter, no direct effect of climate manipulation (reduced rainfall and warming) on enzyme activity was observed. Yet, climate indirectly down-regulated enzyme activity through a decrease in the availability of water extractable organic carbon (WEOC) labile resources. During summer, reduced soil moisture –induced by the climate manipulation– directly reduced soil microbial biomass, which led to a decrease in C-enzyme activity. In general, across both seasons, neither microbial community structure, nor organic matter quality were strong determinants of enzymatic activity. In particular organic matter recalcitrance (aromaticity) was not found as a general driver of either hydrolase or oxidase C-enzyme potential activities, though we did observe higher C-enzyme activities led to an increase of particulate organic matter recalcitrance in the summer season. Overall, our results highlight the seasonality of climate change effects on soil organic matter enzymatic decomposition, providing a comprehensive picture of seasonal potential cause and effect relationships governing C mineralization in subalpine grasslands.
0038-0717
266-274
Puissant, Jérémy
46cab6fc-b57f-4746-aa57-888c24432e70
Jassey, Vincent E.J.
17b9b576-bb3b-4739-830e-744034e5e24a
Mills, Robert T.E.
2631dc09-8166-40a0-a414-f2314e5f1c03
Robroek, Bjorn J.M.
06dcb269-687c-41db-ab73-f61899617f92
Gavazov, Konstantin
de3efabe-3d7a-4781-b20d-499d4e2ddefe
De Danieli, Sebastien
6ae9ad2a-6bfc-450e-a72a-0c721851ea2d
Spiegelberger, Thomas
a05b2734-bc7c-45c7-bda9-ab371164148a
Griffiths, Robert
0ca50094-9394-4c2a-bbeb-8d7e843aff66
Buttler, Alexandre
df5e7c83-0729-4d2c-9534-0331eb8155c8
Brun, Jean-Jacques
d63a4187-aa9a-4e50-8700-50027acedf97
Cécillon, Lauric
c322c60a-d78f-472f-bbf0-fc1e754c7341
Puissant, Jérémy
46cab6fc-b57f-4746-aa57-888c24432e70
Jassey, Vincent E.J.
17b9b576-bb3b-4739-830e-744034e5e24a
Mills, Robert T.E.
2631dc09-8166-40a0-a414-f2314e5f1c03
Robroek, Bjorn J.M.
06dcb269-687c-41db-ab73-f61899617f92
Gavazov, Konstantin
de3efabe-3d7a-4781-b20d-499d4e2ddefe
De Danieli, Sebastien
6ae9ad2a-6bfc-450e-a72a-0c721851ea2d
Spiegelberger, Thomas
a05b2734-bc7c-45c7-bda9-ab371164148a
Griffiths, Robert
0ca50094-9394-4c2a-bbeb-8d7e843aff66
Buttler, Alexandre
df5e7c83-0729-4d2c-9534-0331eb8155c8
Brun, Jean-Jacques
d63a4187-aa9a-4e50-8700-50027acedf97
Cécillon, Lauric
c322c60a-d78f-472f-bbf0-fc1e754c7341

Puissant, Jérémy, Jassey, Vincent E.J., Mills, Robert T.E., Robroek, Bjorn J.M., Gavazov, Konstantin, De Danieli, Sebastien, Spiegelberger, Thomas, Griffiths, Robert, Buttler, Alexandre, Brun, Jean-Jacques and Cécillon, Lauric (2018) Seasonality alters drivers of soil enzyme activity in subalpine grassland soil undergoing climate change. Soil Biology and Biochemistry, 124, 266-274. (doi:10.1016/j.soilbio.2018.06.023).

Record type: Article

Abstract

In mountain ecosystems with marked seasonality, climate change can affect various processes in soils, potentially modifying long-term key soil services via change in soil organic carbon (C) storage. Based on a four-year soil transplantation experiment in Swiss subalpine grasslands, we investigated how imposed climate warming and reduced precipitation modified the drivers of soil carbon enzyme potential activities across winter and summer seasons. Specifically, we used structural equation models (SEMs) to identify biotic (microbial community structure, abundance and activity) and abiotic (quantity and quality of organic matter resources) drivers of soil C-enzymes (hydrolase and oxidase) in two seasons under two different climate scenarios. We found contrasting impacts of the climate manipulation on the drivers of C-enzymes between winter and summer. In winter, no direct effect of climate manipulation (reduced rainfall and warming) on enzyme activity was observed. Yet, climate indirectly down-regulated enzyme activity through a decrease in the availability of water extractable organic carbon (WEOC) labile resources. During summer, reduced soil moisture –induced by the climate manipulation– directly reduced soil microbial biomass, which led to a decrease in C-enzyme activity. In general, across both seasons, neither microbial community structure, nor organic matter quality were strong determinants of enzymatic activity. In particular organic matter recalcitrance (aromaticity) was not found as a general driver of either hydrolase or oxidase C-enzyme potential activities, though we did observe higher C-enzyme activities led to an increase of particulate organic matter recalcitrance in the summer season. Overall, our results highlight the seasonality of climate change effects on soil organic matter enzymatic decomposition, providing a comprehensive picture of seasonal potential cause and effect relationships governing C mineralization in subalpine grasslands.

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Accepted/In Press date: 23 June 2018
e-pub ahead of print date: 25 July 2018
Published date: September 2018

Identifiers

Local EPrints ID: 423490
URI: http://eprints.soton.ac.uk/id/eprint/423490
ISSN: 0038-0717
PURE UUID: 477aa6a9-a6d1-4401-b165-3766075dad3a
ORCID for Bjorn J.M. Robroek: ORCID iD orcid.org/0000-0002-6714-0652

Catalogue record

Date deposited: 24 Sep 2018 16:30
Last modified: 22 Nov 2021 06:41

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Contributors

Author: Jérémy Puissant
Author: Vincent E.J. Jassey
Author: Robert T.E. Mills
Author: Bjorn J.M. Robroek ORCID iD
Author: Konstantin Gavazov
Author: Sebastien De Danieli
Author: Thomas Spiegelberger
Author: Robert Griffiths
Author: Alexandre Buttler
Author: Jean-Jacques Brun
Author: Lauric Cécillon

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