An improved estimation of soil water and salt dynamics by considering soil bulk density changes under freeze/thaw conditions in arid areas with shallow groundwater tables
Liu, Sheng LU ; Huang, Quanzhong ; Zhang, Wenxin LU
; Ren, Dongyang
; Xu, Xu
; Xiong, Yunwu
and Huang, Guanhua
(2023)
In Science of the Total Environment
859.
- Abstract
Soil bulk density (BD) is a parameter dependent on soil texture, compositions of soil minerals and organic matter and the extent of soil compaction. Seasonal freeze/thaw in arid areas with shallow groundwater tables (AASGT) may significantly change BD and hence soil hydrothermal properties and water holding capacity. Therefore, quantifying soil bulk density changes (BDC) under freeze/thaw conditions can improve estimates of soil water-salt dynamics in AASGT. In this study, we conducted field experiments to investigate the soil water-salt dynamics under freeze/thaw conditions from three typical land-use types (i.e., farmland, woodland, and natural land) in the upper Yellow River basin, China. We proposed a method to estimate BDC, which... (More)
Soil bulk density (BD) is a parameter dependent on soil texture, compositions of soil minerals and organic matter and the extent of soil compaction. Seasonal freeze/thaw in arid areas with shallow groundwater tables (AASGT) may significantly change BD and hence soil hydrothermal properties and water holding capacity. Therefore, quantifying soil bulk density changes (BDC) under freeze/thaw conditions can improve estimates of soil water-salt dynamics in AASGT. In this study, we conducted field experiments to investigate the soil water-salt dynamics under freeze/thaw conditions from three typical land-use types (i.e., farmland, woodland, and natural land) in the upper Yellow River basin, China. We proposed a method to estimate BDC, which can better describe the soil water-salt dynamics during the freeze/thaw period. Our results showed marked BDC occurred in all layers within the 0–100 cm profile in natural land, while mainly at the 20–80 cm profile in farmland. During the freezing period, BD in farmland and natural land first decreased rapidly and then remained relatively stable until the thawing period started. After that, BD gradually increased during the thawing period. The largest BDC in farmland and natural land were 0.48 g cm−3 (occurring at the 30–40 cm layer) and 0.43 g cm−3 (occurring at the 80–90 cm layer), respectively, close to 30 % of their initial values. The differences in BDC between the three land-use types were mainly owing to their differences in groundwater table depth, initial soil salt concentration, soil texture, and surface coverage conditions. Moreover, in farmland and natural land, ignoring BDC resulted in different degrees of overestimation or underestimation in soil water content, water fluxes, and soil hydrothermal properties in the selected soil layers. This study demonstrates that considering BDC can improve the accuracy of soil water-salt dynamics estimation in AASGT under freeze/thaw conditions.
(Less)
- author
- Liu, Sheng
LU
; Huang, Quanzhong
; Zhang, Wenxin
LU
; Ren, Dongyang
; Xu, Xu
; Xiong, Yunwu
and Huang, Guanhua
- organization
- publishing date
- 2023-02-10
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Freeze/thaw processes, Frost heaving, Salinity control, Soil deformation, Water-salt dynamics
- in
- Science of the Total Environment
- volume
- 859
- article number
- 160342
- publisher
- Elsevier
- external identifiers
-
- scopus:85142384932
- pmid:36417946
- ISSN
- 0048-9697
- DOI
- 10.1016/j.scitotenv.2022.160342
- language
- English
- LU publication?
- yes
- additional info
- Funding Information: This research was jointly supported by the National Natural Science Foundation of China (Nos. U2243217 , 52220105007 , and 51779256 ) and the National Key Research and Development Program of China (No. 2021YFD1900601 ). W. Z. acknowledged the support by the Swedish Research Council (Vetenskapsrådet) start grant ( 2020-05338 ). Additionally, we greatly appreciate the associate editor and two anonymous reviewers for their constructive comments, which are really helpful for us to improve the quality of the manuscript. Publisher Copyright: © 2022
- id
- e4425322-6a0a-4f00-ab8d-b3078e28ceb1
- date added to LUP
- 2022-12-06 18:15:10
- date last changed
- 2024-06-11 11:19:07
@article{e4425322-6a0a-4f00-ab8d-b3078e28ceb1,
abstract = {{<p>Soil bulk density (BD) is a parameter dependent on soil texture, compositions of soil minerals and organic matter and the extent of soil compaction. Seasonal freeze/thaw in arid areas with shallow groundwater tables (AASGT) may significantly change BD and hence soil hydrothermal properties and water holding capacity. Therefore, quantifying soil bulk density changes (BDC) under freeze/thaw conditions can improve estimates of soil water-salt dynamics in AASGT. In this study, we conducted field experiments to investigate the soil water-salt dynamics under freeze/thaw conditions from three typical land-use types (i.e., farmland, woodland, and natural land) in the upper Yellow River basin, China. We proposed a method to estimate BDC, which can better describe the soil water-salt dynamics during the freeze/thaw period. Our results showed marked BDC occurred in all layers within the 0–100 cm profile in natural land, while mainly at the 20–80 cm profile in farmland. During the freezing period, BD in farmland and natural land first decreased rapidly and then remained relatively stable until the thawing period started. After that, BD gradually increased during the thawing period. The largest BDC in farmland and natural land were 0.48 g cm<sup>−3</sup> (occurring at the 30–40 cm layer) and 0.43 g cm<sup>−3</sup> (occurring at the 80–90 cm layer), respectively, close to 30 % of their initial values. The differences in BDC between the three land-use types were mainly owing to their differences in groundwater table depth, initial soil salt concentration, soil texture, and surface coverage conditions. Moreover, in farmland and natural land, ignoring BDC resulted in different degrees of overestimation or underestimation in soil water content, water fluxes, and soil hydrothermal properties in the selected soil layers. This study demonstrates that considering BDC can improve the accuracy of soil water-salt dynamics estimation in AASGT under freeze/thaw conditions.</p>}},
author = {{Liu, Sheng and Huang, Quanzhong and Zhang, Wenxin and Ren, Dongyang and Xu, Xu and Xiong, Yunwu and Huang, Guanhua}},
issn = {{0048-9697}},
keywords = {{Freeze/thaw processes; Frost heaving; Salinity control; Soil deformation; Water-salt dynamics}},
language = {{eng}},
month = {{02}},
publisher = {{Elsevier}},
series = {{Science of the Total Environment}},
title = {{An improved estimation of soil water and salt dynamics by considering soil bulk density changes under freeze/thaw conditions in arid areas with shallow groundwater tables}},
url = {{http://dx.doi.org/10.1016/j.scitotenv.2022.160342}},
doi = {{10.1016/j.scitotenv.2022.160342}},
volume = {{859}},
year = {{2023}},
}