Temporal, Spatial, and Temperature Controls on Organic Carbon Mineralization and Methanogenesis in Arctic High-Centered Polygon Soils
Warming temperatures in continuous permafrost zones of the Arctic will alter both hydrological and geochemical soil conditions, which are strongly linked with heterotrophic microbial carbon (C) cycling. Heterogeneous permafrost landscapes are often dominated by polygonal features formed by expanding...
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ftdoajarticles:oai:doaj.org/article:2d631d0664b5432083b4011cfa1750f5 2023-05-15T14:53:08+02:00 Temporal, Spatial, and Temperature Controls on Organic Carbon Mineralization and Methanogenesis in Arctic High-Centered Polygon Soils Taniya Roy Chowdhury Erin C. Berns Ji-Won Moon Baohua Gu Liyuan Liang Stan D. Wullschleger David E. Graham 2021-01-01T00:00:00Z https://doi.org/10.3389/fmicb.2020.616518 https://doaj.org/article/2d631d0664b5432083b4011cfa1750f5 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmicb.2020.616518/full https://doaj.org/toc/1664-302X 1664-302X doi:10.3389/fmicb.2020.616518 https://doaj.org/article/2d631d0664b5432083b4011cfa1750f5 Frontiers in Microbiology, Vol 11 (2021) anaerobic carbon mineralization methanogenesis mcrA permafrost Arctic tundra Microbiology QR1-502 article 2021 ftdoajarticles https://doi.org/10.3389/fmicb.2020.616518 2022-12-31T04:06:28Z Warming temperatures in continuous permafrost zones of the Arctic will alter both hydrological and geochemical soil conditions, which are strongly linked with heterotrophic microbial carbon (C) cycling. Heterogeneous permafrost landscapes are often dominated by polygonal features formed by expanding ice wedges: water accumulates in low centered polygons (LCPs), and water drains outward to surrounding troughs in high centered polygons (HCPs). These geospatial differences in hydrology cause gradients in biogeochemistry, soil C storage potential, and thermal properties. Presently, data quantifying carbon dioxide (CO2) and methane (CH4) release from HCP soils are needed to support modeling and evaluation of warming-induced CO2 and CH4 fluxes from tundra soils. This study quantifies the distribution of microbial CO2 and CH4 release in HCPs over a range of temperatures and draws comparisons to previous LCP studies. Arctic tundra soils were initially characterized for geochemical and hydraulic properties. Laboratory incubations at −2, +4, and +8°C were used to quantify temporal trends in CO2 and CH4 production from homogenized active layer organic and mineral soils in HCP centers and troughs, and methanogen abundance was estimated from mcrA gene measurements. Results showed that soil water availability, organic C, and redox conditions influence temporal dynamics and magnitude of gas production from HCP active layer soils during warming. At early incubation times (2–9 days), higher CO2 emissions were observed from HCP trough soils than from HCP center soils, but increased CO2 production occurred in center soils at later times (>20 days). HCP center soils did not support methanogenesis, but CH4-producing trough soils did indicate methanogen presence. Consistent with previous LCP studies, HCP organic soils showed increased CO2 and CH4 production with elevated water content, but HCP trough mineral soils produced more CH4 than LCP mineral soils. HCP mineral soils also released substantial CO2 but did not show a strong ... Article in Journal/Newspaper Arctic Ice permafrost Tundra wedge* Directory of Open Access Journals: DOAJ Articles Arctic Frontiers in Microbiology 11 |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
anaerobic carbon mineralization methanogenesis mcrA permafrost Arctic tundra Microbiology QR1-502 |
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anaerobic carbon mineralization methanogenesis mcrA permafrost Arctic tundra Microbiology QR1-502 Taniya Roy Chowdhury Erin C. Berns Ji-Won Moon Baohua Gu Liyuan Liang Stan D. Wullschleger David E. Graham Temporal, Spatial, and Temperature Controls on Organic Carbon Mineralization and Methanogenesis in Arctic High-Centered Polygon Soils |
topic_facet |
anaerobic carbon mineralization methanogenesis mcrA permafrost Arctic tundra Microbiology QR1-502 |
description |
Warming temperatures in continuous permafrost zones of the Arctic will alter both hydrological and geochemical soil conditions, which are strongly linked with heterotrophic microbial carbon (C) cycling. Heterogeneous permafrost landscapes are often dominated by polygonal features formed by expanding ice wedges: water accumulates in low centered polygons (LCPs), and water drains outward to surrounding troughs in high centered polygons (HCPs). These geospatial differences in hydrology cause gradients in biogeochemistry, soil C storage potential, and thermal properties. Presently, data quantifying carbon dioxide (CO2) and methane (CH4) release from HCP soils are needed to support modeling and evaluation of warming-induced CO2 and CH4 fluxes from tundra soils. This study quantifies the distribution of microbial CO2 and CH4 release in HCPs over a range of temperatures and draws comparisons to previous LCP studies. Arctic tundra soils were initially characterized for geochemical and hydraulic properties. Laboratory incubations at −2, +4, and +8°C were used to quantify temporal trends in CO2 and CH4 production from homogenized active layer organic and mineral soils in HCP centers and troughs, and methanogen abundance was estimated from mcrA gene measurements. Results showed that soil water availability, organic C, and redox conditions influence temporal dynamics and magnitude of gas production from HCP active layer soils during warming. At early incubation times (2–9 days), higher CO2 emissions were observed from HCP trough soils than from HCP center soils, but increased CO2 production occurred in center soils at later times (>20 days). HCP center soils did not support methanogenesis, but CH4-producing trough soils did indicate methanogen presence. Consistent with previous LCP studies, HCP organic soils showed increased CO2 and CH4 production with elevated water content, but HCP trough mineral soils produced more CH4 than LCP mineral soils. HCP mineral soils also released substantial CO2 but did not show a strong ... |
format |
Article in Journal/Newspaper |
author |
Taniya Roy Chowdhury Erin C. Berns Ji-Won Moon Baohua Gu Liyuan Liang Stan D. Wullschleger David E. Graham |
author_facet |
Taniya Roy Chowdhury Erin C. Berns Ji-Won Moon Baohua Gu Liyuan Liang Stan D. Wullschleger David E. Graham |
author_sort |
Taniya Roy Chowdhury |
title |
Temporal, Spatial, and Temperature Controls on Organic Carbon Mineralization and Methanogenesis in Arctic High-Centered Polygon Soils |
title_short |
Temporal, Spatial, and Temperature Controls on Organic Carbon Mineralization and Methanogenesis in Arctic High-Centered Polygon Soils |
title_full |
Temporal, Spatial, and Temperature Controls on Organic Carbon Mineralization and Methanogenesis in Arctic High-Centered Polygon Soils |
title_fullStr |
Temporal, Spatial, and Temperature Controls on Organic Carbon Mineralization and Methanogenesis in Arctic High-Centered Polygon Soils |
title_full_unstemmed |
Temporal, Spatial, and Temperature Controls on Organic Carbon Mineralization and Methanogenesis in Arctic High-Centered Polygon Soils |
title_sort |
temporal, spatial, and temperature controls on organic carbon mineralization and methanogenesis in arctic high-centered polygon soils |
publisher |
Frontiers Media S.A. |
publishDate |
2021 |
url |
https://doi.org/10.3389/fmicb.2020.616518 https://doaj.org/article/2d631d0664b5432083b4011cfa1750f5 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice permafrost Tundra wedge* |
genre_facet |
Arctic Ice permafrost Tundra wedge* |
op_source |
Frontiers in Microbiology, Vol 11 (2021) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmicb.2020.616518/full https://doaj.org/toc/1664-302X 1664-302X doi:10.3389/fmicb.2020.616518 https://doaj.org/article/2d631d0664b5432083b4011cfa1750f5 |
op_doi |
https://doi.org/10.3389/fmicb.2020.616518 |
container_title |
Frontiers in Microbiology |
container_volume |
11 |
_version_ |
1766324545832091648 |