Response of CO2 and CH4 emissions from Arctic tundra soils to a multifactorial manipulation of water table, temperature and thaw depth
Significant uncertainties persist concerning how Arctic soil tundra carbon emission responds to environmental changes. In this study, 24 cores were sampled from drier (high centre polygons and rims) and wetter (low centre polygons and troughs) permafrost tundra ecosystems. We examined how soil CO _2...
Published in: | Environmental Research: Ecology |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
IOP Publishing
2023
|
Subjects: | |
Online Access: | https://doi.org/10.1088/2752-664X/ad089d https://doaj.org/article/c2a396f81d9747b4b64cf9e352f75313 |
id |
ftdoajarticles:oai:doaj.org/article:c2a396f81d9747b4b64cf9e352f75313 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:c2a396f81d9747b4b64cf9e352f75313 2023-12-31T10:03:21+01:00 Response of CO2 and CH4 emissions from Arctic tundra soils to a multifactorial manipulation of water table, temperature and thaw depth K Best D Zona E Briant Chun-Ta Lai D A Lipson K R McEwing S J Davidson W C Oechel 2023-01-01T00:00:00Z https://doi.org/10.1088/2752-664X/ad089d https://doaj.org/article/c2a396f81d9747b4b64cf9e352f75313 EN eng IOP Publishing https://doi.org/10.1088/2752-664X/ad089d https://doaj.org/toc/2752-664X doi:10.1088/2752-664X/ad089d 2752-664X https://doaj.org/article/c2a396f81d9747b4b64cf9e352f75313 Environmental Research: Ecology, Vol 2, Iss 4, p 045003 (2023) wetlands permafrost climate change Ecology QH540-549.5 article 2023 ftdoajarticles https://doi.org/10.1088/2752-664X/ad089d 2023-12-03T01:39:04Z Significant uncertainties persist concerning how Arctic soil tundra carbon emission responds to environmental changes. In this study, 24 cores were sampled from drier (high centre polygons and rims) and wetter (low centre polygons and troughs) permafrost tundra ecosystems. We examined how soil CO _2 and CH _4 fluxes responded to laboratory-based manipulations of soil temperature (and associated thaw depth) and water table depth, representing current and projected conditions in the Arctic. Similar soil CO _2 respiration rates occurred in both the drier and the wetter sites, suggesting that a significant proportion of soil CO _2 emission occurs via anaerobic respiration under water-saturated conditions in these Arctic tundra ecosystems. In the absence of vegetation, soil CO _2 respiration rates decreased sharply within the first 7 weeks of the experiment, while CH _4 emissions remained stable for the entire 26 weeks of the experiment. These patterns suggest that soil CO _2 emission is more related to plant input than CH _4 production and emission. The stable and substantial CH _4 emission observed over the entire course of the experiment suggests that temperature limitations, rather than labile carbon limitations, play a predominant role in CH _4 production in deeper soil layers. This is likely due to the presence of a substantial source of labile carbon in these carbon-rich soils. The small soil temperature difference (a median difference of 1 °C) and a more substantial thaw depth difference (a median difference of 6 cm) between the high and low temperature treatments resulted in a non-significant difference between soil CO _2 and CH _4 emissions. Although hydrology continued to be the primary factor influencing CH _4 emissions, these emissions remained low in the drier ecosystem, even with a water table at the surface. This result suggests the potential absence of a methanogenic microbial community in high-centre polygon and rim ecosystems. Overall, our results suggest that the temperature increases reported for ... Article in Journal/Newspaper Arctic Climate change permafrost Tundra Directory of Open Access Journals: DOAJ Articles Environmental Research: Ecology 2 4 045003 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
wetlands permafrost climate change Ecology QH540-549.5 |
spellingShingle |
wetlands permafrost climate change Ecology QH540-549.5 K Best D Zona E Briant Chun-Ta Lai D A Lipson K R McEwing S J Davidson W C Oechel Response of CO2 and CH4 emissions from Arctic tundra soils to a multifactorial manipulation of water table, temperature and thaw depth |
topic_facet |
wetlands permafrost climate change Ecology QH540-549.5 |
description |
Significant uncertainties persist concerning how Arctic soil tundra carbon emission responds to environmental changes. In this study, 24 cores were sampled from drier (high centre polygons and rims) and wetter (low centre polygons and troughs) permafrost tundra ecosystems. We examined how soil CO _2 and CH _4 fluxes responded to laboratory-based manipulations of soil temperature (and associated thaw depth) and water table depth, representing current and projected conditions in the Arctic. Similar soil CO _2 respiration rates occurred in both the drier and the wetter sites, suggesting that a significant proportion of soil CO _2 emission occurs via anaerobic respiration under water-saturated conditions in these Arctic tundra ecosystems. In the absence of vegetation, soil CO _2 respiration rates decreased sharply within the first 7 weeks of the experiment, while CH _4 emissions remained stable for the entire 26 weeks of the experiment. These patterns suggest that soil CO _2 emission is more related to plant input than CH _4 production and emission. The stable and substantial CH _4 emission observed over the entire course of the experiment suggests that temperature limitations, rather than labile carbon limitations, play a predominant role in CH _4 production in deeper soil layers. This is likely due to the presence of a substantial source of labile carbon in these carbon-rich soils. The small soil temperature difference (a median difference of 1 °C) and a more substantial thaw depth difference (a median difference of 6 cm) between the high and low temperature treatments resulted in a non-significant difference between soil CO _2 and CH _4 emissions. Although hydrology continued to be the primary factor influencing CH _4 emissions, these emissions remained low in the drier ecosystem, even with a water table at the surface. This result suggests the potential absence of a methanogenic microbial community in high-centre polygon and rim ecosystems. Overall, our results suggest that the temperature increases reported for ... |
format |
Article in Journal/Newspaper |
author |
K Best D Zona E Briant Chun-Ta Lai D A Lipson K R McEwing S J Davidson W C Oechel |
author_facet |
K Best D Zona E Briant Chun-Ta Lai D A Lipson K R McEwing S J Davidson W C Oechel |
author_sort |
K Best |
title |
Response of CO2 and CH4 emissions from Arctic tundra soils to a multifactorial manipulation of water table, temperature and thaw depth |
title_short |
Response of CO2 and CH4 emissions from Arctic tundra soils to a multifactorial manipulation of water table, temperature and thaw depth |
title_full |
Response of CO2 and CH4 emissions from Arctic tundra soils to a multifactorial manipulation of water table, temperature and thaw depth |
title_fullStr |
Response of CO2 and CH4 emissions from Arctic tundra soils to a multifactorial manipulation of water table, temperature and thaw depth |
title_full_unstemmed |
Response of CO2 and CH4 emissions from Arctic tundra soils to a multifactorial manipulation of water table, temperature and thaw depth |
title_sort |
response of co2 and ch4 emissions from arctic tundra soils to a multifactorial manipulation of water table, temperature and thaw depth |
publisher |
IOP Publishing |
publishDate |
2023 |
url |
https://doi.org/10.1088/2752-664X/ad089d https://doaj.org/article/c2a396f81d9747b4b64cf9e352f75313 |
genre |
Arctic Climate change permafrost Tundra |
genre_facet |
Arctic Climate change permafrost Tundra |
op_source |
Environmental Research: Ecology, Vol 2, Iss 4, p 045003 (2023) |
op_relation |
https://doi.org/10.1088/2752-664X/ad089d https://doaj.org/toc/2752-664X doi:10.1088/2752-664X/ad089d 2752-664X https://doaj.org/article/c2a396f81d9747b4b64cf9e352f75313 |
op_doi |
https://doi.org/10.1088/2752-664X/ad089d |
container_title |
Environmental Research: Ecology |
container_volume |
2 |
container_issue |
4 |
container_start_page |
045003 |
_version_ |
1786820786748653568 |