Soil respiration of alpine meadow is controlled by freeze–thaw processes of active layer in the permafrost region of the Qinghai–Tibet Plateau
Freezing and thawing action of the active layer plays a significant role in soil respiration ( R s ) in permafrost regions. However, little is known about how the freeze–thaw processes affect the R s dynamics in different stages of the alpine meadow underlain by permafrost in the Qinghai–Tibet Plate...
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ftdoajarticles:oai:doaj.org/article:d9e78c28baee45da8d3da158116939fc 2023-05-15T17:56:58+02:00 Soil respiration of alpine meadow is controlled by freeze–thaw processes of active layer in the permafrost region of the Qinghai–Tibet Plateau J. Wang Q. Wu Z. Yuan H. Kang 2020-09-01T00:00:00Z https://doi.org/10.5194/tc-14-2835-2020 https://doaj.org/article/d9e78c28baee45da8d3da158116939fc EN eng Copernicus Publications https://tc.copernicus.org/articles/14/2835/2020/tc-14-2835-2020.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-14-2835-2020 1994-0416 1994-0424 https://doaj.org/article/d9e78c28baee45da8d3da158116939fc The Cryosphere, Vol 14, Pp 2835-2848 (2020) Environmental sciences GE1-350 Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.5194/tc-14-2835-2020 2022-12-31T11:35:19Z Freezing and thawing action of the active layer plays a significant role in soil respiration ( R s ) in permafrost regions. However, little is known about how the freeze–thaw processes affect the R s dynamics in different stages of the alpine meadow underlain by permafrost in the Qinghai–Tibet Plateau (QTP). We conducted continuous in situ measurements of R s and freeze–thaw processes of the active layer at an alpine meadow site in the Beiluhe permafrost region of the QTP and divided the freeze–thaw processes into four different stages in a complete freeze–thaw cycle, comprising the summer thawing (ST) stage, autumn freezing (AF) stage, winter cooling (WC) stage, and spring warming (SW) stage. We found that the freeze–thaw processes have various effects on the R s dynamics in different freeze–thaw stages. The mean R s ranged from 0.12 to 3.18 µ mol m −2 s −1 across the stages, with the lowest value in WC and highest value in ST. Q 10 among the different freeze–thaw stages changed greatly, with the maximum ( 4.91±0.35 ) in WC and minimum ( 0.33±0.21 ) in AF. Patterns of R s among the ST, AF, WC, and SW stages differed, and the corresponding contribution percentages of cumulative R s to total R s of a complete freeze–thaw cycle ( 1692.98±51.43 g CO 2 m −2 ) were 61.32±0.32 %, 8.89±0.18 %, 18.43±0.11 %, and 11.29±0.11 %, respectively. Soil temperature ( T s ) was the most important driver of R s regardless of soil water status in all stages. Our results suggest that as climate change and permafrost degradation continue, great changes in freeze–thaw process patterns may trigger more R s emissions from this ecosystem because of a prolonged ST stage. Article in Journal/Newspaper permafrost The Cryosphere Directory of Open Access Journals: DOAJ Articles The Cryosphere 14 9 2835 2848 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
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Environmental sciences GE1-350 Geology QE1-996.5 J. Wang Q. Wu Z. Yuan H. Kang Soil respiration of alpine meadow is controlled by freeze–thaw processes of active layer in the permafrost region of the Qinghai–Tibet Plateau |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
Freezing and thawing action of the active layer plays a significant role in soil respiration ( R s ) in permafrost regions. However, little is known about how the freeze–thaw processes affect the R s dynamics in different stages of the alpine meadow underlain by permafrost in the Qinghai–Tibet Plateau (QTP). We conducted continuous in situ measurements of R s and freeze–thaw processes of the active layer at an alpine meadow site in the Beiluhe permafrost region of the QTP and divided the freeze–thaw processes into four different stages in a complete freeze–thaw cycle, comprising the summer thawing (ST) stage, autumn freezing (AF) stage, winter cooling (WC) stage, and spring warming (SW) stage. We found that the freeze–thaw processes have various effects on the R s dynamics in different freeze–thaw stages. The mean R s ranged from 0.12 to 3.18 µ mol m −2 s −1 across the stages, with the lowest value in WC and highest value in ST. Q 10 among the different freeze–thaw stages changed greatly, with the maximum ( 4.91±0.35 ) in WC and minimum ( 0.33±0.21 ) in AF. Patterns of R s among the ST, AF, WC, and SW stages differed, and the corresponding contribution percentages of cumulative R s to total R s of a complete freeze–thaw cycle ( 1692.98±51.43 g CO 2 m −2 ) were 61.32±0.32 %, 8.89±0.18 %, 18.43±0.11 %, and 11.29±0.11 %, respectively. Soil temperature ( T s ) was the most important driver of R s regardless of soil water status in all stages. Our results suggest that as climate change and permafrost degradation continue, great changes in freeze–thaw process patterns may trigger more R s emissions from this ecosystem because of a prolonged ST stage. |
format |
Article in Journal/Newspaper |
author |
J. Wang Q. Wu Z. Yuan H. Kang |
author_facet |
J. Wang Q. Wu Z. Yuan H. Kang |
author_sort |
J. Wang |
title |
Soil respiration of alpine meadow is controlled by freeze–thaw processes of active layer in the permafrost region of the Qinghai–Tibet Plateau |
title_short |
Soil respiration of alpine meadow is controlled by freeze–thaw processes of active layer in the permafrost region of the Qinghai–Tibet Plateau |
title_full |
Soil respiration of alpine meadow is controlled by freeze–thaw processes of active layer in the permafrost region of the Qinghai–Tibet Plateau |
title_fullStr |
Soil respiration of alpine meadow is controlled by freeze–thaw processes of active layer in the permafrost region of the Qinghai–Tibet Plateau |
title_full_unstemmed |
Soil respiration of alpine meadow is controlled by freeze–thaw processes of active layer in the permafrost region of the Qinghai–Tibet Plateau |
title_sort |
soil respiration of alpine meadow is controlled by freeze–thaw processes of active layer in the permafrost region of the qinghai–tibet plateau |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-14-2835-2020 https://doaj.org/article/d9e78c28baee45da8d3da158116939fc |
genre |
permafrost The Cryosphere |
genre_facet |
permafrost The Cryosphere |
op_source |
The Cryosphere, Vol 14, Pp 2835-2848 (2020) |
op_relation |
https://tc.copernicus.org/articles/14/2835/2020/tc-14-2835-2020.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-14-2835-2020 1994-0416 1994-0424 https://doaj.org/article/d9e78c28baee45da8d3da158116939fc |
op_doi |
https://doi.org/10.5194/tc-14-2835-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
9 |
container_start_page |
2835 |
op_container_end_page |
2848 |
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1766165302607872000 |