Response of soil hydrothermal processes within the active layer to variable alpine vegetation in the Yangtze River Source Area, Qinghai-Tibet plateau
Study region: The source region of the Yangtze River in the Qinghai-Tibet Plateau, China. Study focus: In the context of global warming, conducting a comprehensive study on the hydrothermal processes and their influencing factors in the permafrost active layer of the Tibetan Plateau is crucial for g...
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ftdoajarticles:oai:doaj.org/article:6caecde629c944b8bab68c287b5f705c 2024-09-15T17:34:55+00:00 Response of soil hydrothermal processes within the active layer to variable alpine vegetation in the Yangtze River Source Area, Qinghai-Tibet plateau Bin Yang Yanghai Duan Jingyi Zhao Changhai Tan Ji-mi Gesang Long Chen Yanggang Zhao Xunxun Zhang 2024-08-01T00:00:00Z https://doi.org/10.1016/j.ejrh.2024.101850 https://doaj.org/article/6caecde629c944b8bab68c287b5f705c EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S2214581824001988 https://doaj.org/toc/2214-5818 2214-5818 doi:10.1016/j.ejrh.2024.101850 https://doaj.org/article/6caecde629c944b8bab68c287b5f705c Journal of Hydrology: Regional Studies, Vol 54, Iss , Pp 101850- (2024) Active layer Permafrost Hydrothermal process Freeze-thaw index Alpine grasslands Yangtze River Source Area (YRSA) Physical geography GB3-5030 Geology QE1-996.5 article 2024 ftdoajarticles https://doi.org/10.1016/j.ejrh.2024.101850 2024-08-05T17:50:08Z Study region: The source region of the Yangtze River in the Qinghai-Tibet Plateau, China. Study focus: In the context of global warming, conducting a comprehensive study on the hydrothermal processes and their influencing factors in the permafrost active layer of the Tibetan Plateau is crucial for gaining a better understanding of the ecohydrological processes in alpine grasslands. In this study, we analyzed differences in soil temperature and humidity change patterns in the active layer of four alpine grassland types in the Totuohe Basin of the Yangtze River source area. We aimed to discuss the influence of vegetation, soil, and other factors on the hydrothermal mechanism of the active layer. The main research results are as follows: (1) Significant differences in the active layer's hydrothermal regime, with higher vegetation cover correlating to lower thaw indices and better moisture conditions. (2) Vegetation and water content strongly influence thermal conditions and active layer thickness. In high-cover alpine meadows, ground surface temperature is lower with a 200 cm active layer, while swamp meadows have a shallowest layer at 160 cm. (3) Deeper active layer moisture is influenced by freezing and thawing, while shallower layers are affected by warm-season precipitation and soil texture. (4) Negative heat fluxes in the topsoil of alpine swamp and high-cover meadows indicate substantial heat release, likely contributing to permafrost preservation due to high active layer water content. New hydrological insights for the region: (1) Vegetation cover significantly influences the thermal and moisture conditions of the active layer, with higher vegetation associated with lower thaw indices and better moisture conditions.(2) Soil moisture distribution within the active layer is controlled by both freeze-thaw cycles and warm-season precipitation, indicating complex interactions between seasonal processes and soil properties. Article in Journal/Newspaper Active layer thickness permafrost Directory of Open Access Journals: DOAJ Articles Journal of Hydrology: Regional Studies 54 101850 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Active layer Permafrost Hydrothermal process Freeze-thaw index Alpine grasslands Yangtze River Source Area (YRSA) Physical geography GB3-5030 Geology QE1-996.5 |
spellingShingle |
Active layer Permafrost Hydrothermal process Freeze-thaw index Alpine grasslands Yangtze River Source Area (YRSA) Physical geography GB3-5030 Geology QE1-996.5 Bin Yang Yanghai Duan Jingyi Zhao Changhai Tan Ji-mi Gesang Long Chen Yanggang Zhao Xunxun Zhang Response of soil hydrothermal processes within the active layer to variable alpine vegetation in the Yangtze River Source Area, Qinghai-Tibet plateau |
topic_facet |
Active layer Permafrost Hydrothermal process Freeze-thaw index Alpine grasslands Yangtze River Source Area (YRSA) Physical geography GB3-5030 Geology QE1-996.5 |
description |
Study region: The source region of the Yangtze River in the Qinghai-Tibet Plateau, China. Study focus: In the context of global warming, conducting a comprehensive study on the hydrothermal processes and their influencing factors in the permafrost active layer of the Tibetan Plateau is crucial for gaining a better understanding of the ecohydrological processes in alpine grasslands. In this study, we analyzed differences in soil temperature and humidity change patterns in the active layer of four alpine grassland types in the Totuohe Basin of the Yangtze River source area. We aimed to discuss the influence of vegetation, soil, and other factors on the hydrothermal mechanism of the active layer. The main research results are as follows: (1) Significant differences in the active layer's hydrothermal regime, with higher vegetation cover correlating to lower thaw indices and better moisture conditions. (2) Vegetation and water content strongly influence thermal conditions and active layer thickness. In high-cover alpine meadows, ground surface temperature is lower with a 200 cm active layer, while swamp meadows have a shallowest layer at 160 cm. (3) Deeper active layer moisture is influenced by freezing and thawing, while shallower layers are affected by warm-season precipitation and soil texture. (4) Negative heat fluxes in the topsoil of alpine swamp and high-cover meadows indicate substantial heat release, likely contributing to permafrost preservation due to high active layer water content. New hydrological insights for the region: (1) Vegetation cover significantly influences the thermal and moisture conditions of the active layer, with higher vegetation associated with lower thaw indices and better moisture conditions.(2) Soil moisture distribution within the active layer is controlled by both freeze-thaw cycles and warm-season precipitation, indicating complex interactions between seasonal processes and soil properties. |
format |
Article in Journal/Newspaper |
author |
Bin Yang Yanghai Duan Jingyi Zhao Changhai Tan Ji-mi Gesang Long Chen Yanggang Zhao Xunxun Zhang |
author_facet |
Bin Yang Yanghai Duan Jingyi Zhao Changhai Tan Ji-mi Gesang Long Chen Yanggang Zhao Xunxun Zhang |
author_sort |
Bin Yang |
title |
Response of soil hydrothermal processes within the active layer to variable alpine vegetation in the Yangtze River Source Area, Qinghai-Tibet plateau |
title_short |
Response of soil hydrothermal processes within the active layer to variable alpine vegetation in the Yangtze River Source Area, Qinghai-Tibet plateau |
title_full |
Response of soil hydrothermal processes within the active layer to variable alpine vegetation in the Yangtze River Source Area, Qinghai-Tibet plateau |
title_fullStr |
Response of soil hydrothermal processes within the active layer to variable alpine vegetation in the Yangtze River Source Area, Qinghai-Tibet plateau |
title_full_unstemmed |
Response of soil hydrothermal processes within the active layer to variable alpine vegetation in the Yangtze River Source Area, Qinghai-Tibet plateau |
title_sort |
response of soil hydrothermal processes within the active layer to variable alpine vegetation in the yangtze river source area, qinghai-tibet plateau |
publisher |
Elsevier |
publishDate |
2024 |
url |
https://doi.org/10.1016/j.ejrh.2024.101850 https://doaj.org/article/6caecde629c944b8bab68c287b5f705c |
genre |
Active layer thickness permafrost |
genre_facet |
Active layer thickness permafrost |
op_source |
Journal of Hydrology: Regional Studies, Vol 54, Iss , Pp 101850- (2024) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S2214581824001988 https://doaj.org/toc/2214-5818 2214-5818 doi:10.1016/j.ejrh.2024.101850 https://doaj.org/article/6caecde629c944b8bab68c287b5f705c |
op_doi |
https://doi.org/10.1016/j.ejrh.2024.101850 |
container_title |
Journal of Hydrology: Regional Studies |
container_volume |
54 |
container_start_page |
101850 |
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1810433640540143616 |