Microbial response to warming and cellulose addition in a maritime Antarctic soil
Abstract Maritime Antarctic King George Island (South Shetland Islands) has experienced rapid warming in recent decades, but the impacts on soil organic matter (SOM) decomposition remain ambiguous. Most vegetation cover is dominated by bryophytes (mosses), whereas a few vascular plants, such as Desc...
Published in: | Permafrost and Periglacial Processes |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2023
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/ppp.2182 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2182 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ppp.2182 |
id |
crwiley:10.1002/ppp.2182 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/ppp.2182 2024-09-15T17:47:43+00:00 Microbial response to warming and cellulose addition in a maritime Antarctic soil Pradel, Paulina Bravo, León A. Merino, Carolina Trefault, Nicole Rodríguez, Rodrigo Knicker, Heike Jara, Claudia Larama, Giovanni Matus, Francisco 2023 http://dx.doi.org/10.1002/ppp.2182 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2182 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ppp.2182 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 34, issue 3, page 370-383 ISSN 1045-6740 1099-1530 journal-article 2023 crwiley https://doi.org/10.1002/ppp.2182 2024-08-30T04:10:29Z Abstract Maritime Antarctic King George Island (South Shetland Islands) has experienced rapid warming in recent decades, but the impacts on soil organic matter (SOM) decomposition remain ambiguous. Most vegetation cover is dominated by bryophytes (mosses), whereas a few vascular plants, such as Deschampsia antarctica and Colobanthus quitensis grow interspersed. Therefore, SOM is mainly enriched with carbohydrates and C‐alkyl, provided by mosses, which lack lignin as a precursor for aromatic compounds and humus formation. However, there is no clear answer to how substrate and temperature increase changes in Antarctic microbial respiration. We determined in what way SOM mineralization changes with temperature and substrate addition by characterizing the temperature sensitivity (Q 10 ) of soil respiration in an open‐top chamber warming experiment. We hypothesized that: (a) cold‐tolerant microorganisms are well adapted to growing in maritime Antarctic soils (~ 0°C), so would not respond to low and moderate temperature increases because they undergo various metabolic mechanism adjustments until they experience increasing temperatures toward optimum growth (e.g., by enzyme production); and (b) cellulose, as a complex carbonaceous substrate of vegetated areas in Maritime Antarctic soils, activates microorganisms, increasing the Q 10 of soil organic carbon (SOC) mineralization. Soils (5–10 cm) were sampled after four consecutive years of experimental warming for SOC composition, microbial community structure, and C mineralization at 4, 12, and 20°C with and without cellulose addition. Functional group chemoheterotrophs, represented mainly by Proteobacteria, decomposed more refractory SOC (aromatic compounds), as indicated by nuclear magnetic resonance (NMR) spectroscopy, in ambient plots than in warming plots where plants were growing. The C‐CO 2 efflux from the incubation experiment remained stable below 12°C but sharply increased at 20°C. Q 10 varied between 0.4 and 4 and was reduced at 20°C, whereas cellulose ... Article in Journal/Newspaper Antarc* Antarctic Antarctica King George Island Permafrost and Periglacial Processes South Shetland Islands Wiley Online Library Permafrost and Periglacial Processes 34 3 370 383 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Maritime Antarctic King George Island (South Shetland Islands) has experienced rapid warming in recent decades, but the impacts on soil organic matter (SOM) decomposition remain ambiguous. Most vegetation cover is dominated by bryophytes (mosses), whereas a few vascular plants, such as Deschampsia antarctica and Colobanthus quitensis grow interspersed. Therefore, SOM is mainly enriched with carbohydrates and C‐alkyl, provided by mosses, which lack lignin as a precursor for aromatic compounds and humus formation. However, there is no clear answer to how substrate and temperature increase changes in Antarctic microbial respiration. We determined in what way SOM mineralization changes with temperature and substrate addition by characterizing the temperature sensitivity (Q 10 ) of soil respiration in an open‐top chamber warming experiment. We hypothesized that: (a) cold‐tolerant microorganisms are well adapted to growing in maritime Antarctic soils (~ 0°C), so would not respond to low and moderate temperature increases because they undergo various metabolic mechanism adjustments until they experience increasing temperatures toward optimum growth (e.g., by enzyme production); and (b) cellulose, as a complex carbonaceous substrate of vegetated areas in Maritime Antarctic soils, activates microorganisms, increasing the Q 10 of soil organic carbon (SOC) mineralization. Soils (5–10 cm) were sampled after four consecutive years of experimental warming for SOC composition, microbial community structure, and C mineralization at 4, 12, and 20°C with and without cellulose addition. Functional group chemoheterotrophs, represented mainly by Proteobacteria, decomposed more refractory SOC (aromatic compounds), as indicated by nuclear magnetic resonance (NMR) spectroscopy, in ambient plots than in warming plots where plants were growing. The C‐CO 2 efflux from the incubation experiment remained stable below 12°C but sharply increased at 20°C. Q 10 varied between 0.4 and 4 and was reduced at 20°C, whereas cellulose ... |
format |
Article in Journal/Newspaper |
author |
Pradel, Paulina Bravo, León A. Merino, Carolina Trefault, Nicole Rodríguez, Rodrigo Knicker, Heike Jara, Claudia Larama, Giovanni Matus, Francisco |
spellingShingle |
Pradel, Paulina Bravo, León A. Merino, Carolina Trefault, Nicole Rodríguez, Rodrigo Knicker, Heike Jara, Claudia Larama, Giovanni Matus, Francisco Microbial response to warming and cellulose addition in a maritime Antarctic soil |
author_facet |
Pradel, Paulina Bravo, León A. Merino, Carolina Trefault, Nicole Rodríguez, Rodrigo Knicker, Heike Jara, Claudia Larama, Giovanni Matus, Francisco |
author_sort |
Pradel, Paulina |
title |
Microbial response to warming and cellulose addition in a maritime Antarctic soil |
title_short |
Microbial response to warming and cellulose addition in a maritime Antarctic soil |
title_full |
Microbial response to warming and cellulose addition in a maritime Antarctic soil |
title_fullStr |
Microbial response to warming and cellulose addition in a maritime Antarctic soil |
title_full_unstemmed |
Microbial response to warming and cellulose addition in a maritime Antarctic soil |
title_sort |
microbial response to warming and cellulose addition in a maritime antarctic soil |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1002/ppp.2182 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2182 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ppp.2182 |
genre |
Antarc* Antarctic Antarctica King George Island Permafrost and Periglacial Processes South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctica King George Island Permafrost and Periglacial Processes South Shetland Islands |
op_source |
Permafrost and Periglacial Processes volume 34, issue 3, page 370-383 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.2182 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
34 |
container_issue |
3 |
container_start_page |
370 |
op_container_end_page |
383 |
_version_ |
1810497212126330880 |