Cooling and wetting of soil decelerated ground freezing–thawing processes of the active layer in Xing'an permafrost regions in Northeast China
The accelerated or decelerated freezing–thawing processes of the active layer in Xing'an permafrost regions are crucial for the protection of permafrost. To better understand the freezing–thawing processes of the active layer and its driving factors, according to the observation from 2017 to 20...
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KeAi Communications Co., Ltd.
2023-02-01
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| Series: | Advances in Climate Change Research |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674927823000114 |
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| author | Bo-Quan Lu Shu-Ying Zang Li-Quan Song Li Sun Miao Li Di Bing |
| author_facet | Bo-Quan Lu Shu-Ying Zang Li-Quan Song Li Sun Miao Li Di Bing |
| author_sort | Bo-Quan Lu |
| collection | DOAJ |
| description | The accelerated or decelerated freezing–thawing processes of the active layer in Xing'an permafrost regions are crucial for the protection of permafrost. To better understand the freezing–thawing processes of the active layer and its driving factors, according to the observation from 2017 to 2020 of soil temperature and water content in the active layer of forest and peatland in two representative hemiboreal ecosystems in the Da Xing'anling Mountains, Northeast China, the study explored in detail the effects of climatic conditions and local factors on the hydrothermal and freezing–thawing processes of active layer soils. The results showed that during the freezing–thawing cycles of 2017–2020, freezing and thawing start times in the peatland and forest ecosystems soils were generally delayed, and it took longer for the active layer soil to completely thaw than to freeze. The annual average soil temperature in the peatland's active layer (5–80 cm) was 0.7–2.0 °C lower than that in the forest, and the annual average soil moisture content on the peatland was 5.5%–26.7% higher than that in the forest. Compared with the forest ecosystem soils, the ground surface freezing time of the peatland was delayed by 3–10 d, and the freezing rate decreased by 1.1–1.5 cm d−1, while the beginning time of thawing was advanced by 22–27 d, and the thawing rate decreased by 1.3–1.4 cm d−1. In the process of decreasing soil temperature and increasing soil moisture content, the freezing and thawing rate of the active layer would be reduced, decelerating the freezing–thawing processes of the active layer in the process of decreasing soil temperature and increasing soil moisture content. The results provide the key original data for studying the formation and evolution of active layer and permafrost in the Xing'an permafrost regions in Northeast China and can be used to validate the prediction of ecosystem succession under the combined influences of climate change and permafrost degradation. |
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| format | Article |
| id | doaj.art-49ae9011949e4eee8e8617924540ab60 |
| institution | Directory Open Access Journal |
| issn | 1674-9278 |
| language | English |
| last_indexed | 2024-04-09T23:43:34Z |
| publishDate | 2023-02-01 |
| publisher | KeAi Communications Co., Ltd. |
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| series | Advances in Climate Change Research |
| spelling | doaj.art-49ae9011949e4eee8e8617924540ab602023-03-18T04:40:44ZengKeAi Communications Co., Ltd.Advances in Climate Change Research1674-92782023-02-01141126135Cooling and wetting of soil decelerated ground freezing–thawing processes of the active layer in Xing'an permafrost regions in Northeast ChinaBo-Quan Lu0Shu-Ying Zang1Li-Quan Song2Li Sun3Miao Li4Di Bing5Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regions, Harbin Normal University, Harbin 150025, China; Heilongjiang Province Collaborative Innovation Center of Cold Region Ecological Safety, Harbin 150025, ChinaHeilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regions, Harbin Normal University, Harbin 150025, China; Heilongjiang Province Collaborative Innovation Center of Cold Region Ecological Safety, Harbin 150025, China; Corresponding author. Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regions, Harbin Normal University, Harbin 150025, China.Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regions, Harbin Normal University, Harbin 150025, China; Heilongjiang Province Collaborative Innovation Center of Cold Region Ecological Safety, Harbin 150025, ChinaHeilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regions, Harbin Normal University, Harbin 150025, China; Heilongjiang Province Collaborative Innovation Center of Cold Region Ecological Safety, Harbin 150025, ChinaHeilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regions, Harbin Normal University, Harbin 150025, China; Heilongjiang Province Collaborative Innovation Center of Cold Region Ecological Safety, Harbin 150025, ChinaHeilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regions, Harbin Normal University, Harbin 150025, China; Heilongjiang Province Collaborative Innovation Center of Cold Region Ecological Safety, Harbin 150025, ChinaThe accelerated or decelerated freezing–thawing processes of the active layer in Xing'an permafrost regions are crucial for the protection of permafrost. To better understand the freezing–thawing processes of the active layer and its driving factors, according to the observation from 2017 to 2020 of soil temperature and water content in the active layer of forest and peatland in two representative hemiboreal ecosystems in the Da Xing'anling Mountains, Northeast China, the study explored in detail the effects of climatic conditions and local factors on the hydrothermal and freezing–thawing processes of active layer soils. The results showed that during the freezing–thawing cycles of 2017–2020, freezing and thawing start times in the peatland and forest ecosystems soils were generally delayed, and it took longer for the active layer soil to completely thaw than to freeze. The annual average soil temperature in the peatland's active layer (5–80 cm) was 0.7–2.0 °C lower than that in the forest, and the annual average soil moisture content on the peatland was 5.5%–26.7% higher than that in the forest. Compared with the forest ecosystem soils, the ground surface freezing time of the peatland was delayed by 3–10 d, and the freezing rate decreased by 1.1–1.5 cm d−1, while the beginning time of thawing was advanced by 22–27 d, and the thawing rate decreased by 1.3–1.4 cm d−1. In the process of decreasing soil temperature and increasing soil moisture content, the freezing and thawing rate of the active layer would be reduced, decelerating the freezing–thawing processes of the active layer in the process of decreasing soil temperature and increasing soil moisture content. The results provide the key original data for studying the formation and evolution of active layer and permafrost in the Xing'an permafrost regions in Northeast China and can be used to validate the prediction of ecosystem succession under the combined influences of climate change and permafrost degradation.http://www.sciencedirect.com/science/article/pii/S1674927823000114Freezing–thawing processesHydrothermal dynamicsActive layerHemiboreal ecosystemsXing'an permafrost |
| spellingShingle | Bo-Quan Lu Shu-Ying Zang Li-Quan Song Li Sun Miao Li Di Bing Cooling and wetting of soil decelerated ground freezing–thawing processes of the active layer in Xing'an permafrost regions in Northeast China Advances in Climate Change Research Freezing–thawing processes Hydrothermal dynamics Active layer Hemiboreal ecosystems Xing'an permafrost |
| title | Cooling and wetting of soil decelerated ground freezing–thawing processes of the active layer in Xing'an permafrost regions in Northeast China |
| title_full | Cooling and wetting of soil decelerated ground freezing–thawing processes of the active layer in Xing'an permafrost regions in Northeast China |
| title_fullStr | Cooling and wetting of soil decelerated ground freezing–thawing processes of the active layer in Xing'an permafrost regions in Northeast China |
| title_full_unstemmed | Cooling and wetting of soil decelerated ground freezing–thawing processes of the active layer in Xing'an permafrost regions in Northeast China |
| title_short | Cooling and wetting of soil decelerated ground freezing–thawing processes of the active layer in Xing'an permafrost regions in Northeast China |
| title_sort | cooling and wetting of soil decelerated ground freezing thawing processes of the active layer in xing an permafrost regions in northeast china |
| topic | Freezing–thawing processes Hydrothermal dynamics Active layer Hemiboreal ecosystems Xing'an permafrost |
| url | http://www.sciencedirect.com/science/article/pii/S1674927823000114 |
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