Hydrological functioning of thawing soil water in a permafrost‐influenced alpine meadow hillslope
Abstract The complex variation of the hydrological functioning of soil water has been widely studied using measurements of the stable isotopic composition of either the bulk soil water (BSW) collected by the cryogenic vacuum extraction method or the mobile soil water (MSW) collected by the zero‐tens...
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crwiley:10.1002/vzj2.20022 2024-06-23T07:56:06+00:00 Hydrological functioning of thawing soil water in a permafrost‐influenced alpine meadow hillslope Xiao, Xiong Zhang, Fan Li, Xiaoyan Wang, Guanxing Zeng, Chen Shi, Xiaonan National Natural Science Foundation of China 2020 http://dx.doi.org/10.1002/vzj2.20022 https://onlinelibrary.wiley.com/doi/pdf/10.1002/vzj2.20022 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/vzj2.20022 en eng Wiley http://creativecommons.org/licenses/by-nc-nd/4.0/ Vadose Zone Journal volume 19, issue 1 ISSN 1539-1663 1539-1663 journal-article 2020 crwiley https://doi.org/10.1002/vzj2.20022 2024-06-06T04:24:01Z Abstract The complex variation of the hydrological functioning of soil water has been widely studied using measurements of the stable isotopic composition of either the bulk soil water (BSW) collected by the cryogenic vacuum extraction method or the mobile soil water (MSW) collected by the zero‐tension soil lysimeter method. We collected samples of precipitation, BSW, MSW, and hillslope runoff in an alpine meadow hillslope influenced by permafrost to investigate the hydrological functioning of thawing soil water. The results showed that the δ 2 H values in BSW were generally more negative than those of the MSW, which may be a result of the depleted spring snowmelt that formed the tightly bound soil water. The relatively stable characteristics of δ 2 H in the MSW were related to the dynamic mixing of newly infiltrated precipitation with slightly enriched mobile water held by the low soil matrix potential. The δ 2 H values in the BSW showed higher temporal variations than the values in the MSW, which were mainly related to the mixing of depleted tightly bound soil water and enriched MSW in varying fractions. The MSW better represented the lateral subsurface flow (SSF, which further generated streamflow) than the BSW samples considering the relatively close stable isotopic values between the lateral SSF and the MSW in the same soil layer. The results of this study show the influences of the varying water level maintained by the underlying permafrost on the water and isotopic dynamics of both the soil water pools and streamflow. Article in Journal/Newspaper permafrost Wiley Online Library Vadose Zone Journal 19 1 |
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Open Polar |
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Wiley Online Library |
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English |
description |
Abstract The complex variation of the hydrological functioning of soil water has been widely studied using measurements of the stable isotopic composition of either the bulk soil water (BSW) collected by the cryogenic vacuum extraction method or the mobile soil water (MSW) collected by the zero‐tension soil lysimeter method. We collected samples of precipitation, BSW, MSW, and hillslope runoff in an alpine meadow hillslope influenced by permafrost to investigate the hydrological functioning of thawing soil water. The results showed that the δ 2 H values in BSW were generally more negative than those of the MSW, which may be a result of the depleted spring snowmelt that formed the tightly bound soil water. The relatively stable characteristics of δ 2 H in the MSW were related to the dynamic mixing of newly infiltrated precipitation with slightly enriched mobile water held by the low soil matrix potential. The δ 2 H values in the BSW showed higher temporal variations than the values in the MSW, which were mainly related to the mixing of depleted tightly bound soil water and enriched MSW in varying fractions. The MSW better represented the lateral subsurface flow (SSF, which further generated streamflow) than the BSW samples considering the relatively close stable isotopic values between the lateral SSF and the MSW in the same soil layer. The results of this study show the influences of the varying water level maintained by the underlying permafrost on the water and isotopic dynamics of both the soil water pools and streamflow. |
author2 |
National Natural Science Foundation of China |
format |
Article in Journal/Newspaper |
author |
Xiao, Xiong Zhang, Fan Li, Xiaoyan Wang, Guanxing Zeng, Chen Shi, Xiaonan |
spellingShingle |
Xiao, Xiong Zhang, Fan Li, Xiaoyan Wang, Guanxing Zeng, Chen Shi, Xiaonan Hydrological functioning of thawing soil water in a permafrost‐influenced alpine meadow hillslope |
author_facet |
Xiao, Xiong Zhang, Fan Li, Xiaoyan Wang, Guanxing Zeng, Chen Shi, Xiaonan |
author_sort |
Xiao, Xiong |
title |
Hydrological functioning of thawing soil water in a permafrost‐influenced alpine meadow hillslope |
title_short |
Hydrological functioning of thawing soil water in a permafrost‐influenced alpine meadow hillslope |
title_full |
Hydrological functioning of thawing soil water in a permafrost‐influenced alpine meadow hillslope |
title_fullStr |
Hydrological functioning of thawing soil water in a permafrost‐influenced alpine meadow hillslope |
title_full_unstemmed |
Hydrological functioning of thawing soil water in a permafrost‐influenced alpine meadow hillslope |
title_sort |
hydrological functioning of thawing soil water in a permafrost‐influenced alpine meadow hillslope |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/vzj2.20022 https://onlinelibrary.wiley.com/doi/pdf/10.1002/vzj2.20022 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/vzj2.20022 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Vadose Zone Journal volume 19, issue 1 ISSN 1539-1663 1539-1663 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1002/vzj2.20022 |
container_title |
Vadose Zone Journal |
container_volume |
19 |
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1 |
_version_ |
1802648983709941760 |