Effect of freeze-thaw processes on soil water transport of farmland in a semi-arid area

Sun, Libo; Chang, Xiaomin; Yu, Xinxiao; Jia, Guodong; Chen, Lihua; Wang, Yusong; Liu, Ziqiang

doi:10.1016/j.agwat.2021.106876

Cited by 29 publications

(10 citation statements)

References 32 publications

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“…Changes in soil texture had a strong influence on SWC, 34 as the soil particles gradually growing with the increase of depth during the deposition cycle, the soil particles show coarser, resulting in higher SWC of the upper soil than the deep soil. 35 In this study, only the CMI and CK regions H 0.5–2.0 > H 2.5–6.0 , while to depths below 6 m, the overall SWC began to stabilize. At depths below 6 m, the SWC gradually reaches a saturated and stable state.…”

Section: Resultsmentioning

confidence: 48%

Effects of Underground Coal Mining on Soil Spatial Water Content Distribution and Plant Growth Type in Northwest China

Zhang

Yang

et al. 2022

ACS Omega

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The impact of coal mining subsidence on surface ecology involves the influence of several ecological elements such as water, soil, and vegetation, which is systematic and complex. Given the unclear understanding of the synergistic change patterns of the water–soil–vegetation ecological elements in the influence of coal mining in the west, this paper investigates the impact of coal mining on the surface ecology, especially the distribution of soil water content (SWC). In 2020, this study collected 3000 soil samples from 60 sampling points (at depth of 0–10 m) and tested the SWC. All samples come from three different temporal and spatial areas of coal mining subsidence in the desert mining area of Northwest China where soil types are mainly aridisols. At the same time, the interactions among deep SWC and surface soil physical and chemical properties, surface SWC and soil fertility, and pH were analyzed. The spatial variability of soil moisture is reflected by kriging interpolation, and SWC values at different depths are predicted as a basis for monitoring the environmental impact of different coal mining subsidence years. The research has shown that the ground subsidence leads to a decrease in SWC value and changes in surface soil pH, physical and chemical properties, and covering vegetation, which have occurred from the beginning of coal mining. The impact of coal mining on the SWC of the unsaturated zone is mainly at the depth of 0–6 m, where SWC is not directly related to the nutrient content of the surface soil. The overall settlement of the ground will stir up simultaneous decline in the quality of deep SWC and topsoil. The findings of this investigation suggest that changes in the soil structure caused by coal mining subsidence are the key factor in SWC loss. Timely monitoring and repairing 0–6 m ground fissures, as well as selecting shrubs on the surface is the best choice for the restoration of the ecological environment and prevention of soil erosion in this area.

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Section: Resultsmentioning

confidence: 48%

Effects of Underground Coal Mining on Soil Spatial Water Content Distribution and Plant Growth Type in Northwest China

Zhang

Yang

et al. 2022

ACS Omega

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“…Soil temperature was affected by air temperature (Sun et al, 2021), there was no signi cant difference among 2cm, 5cm and 15cm of soil temperature (p<0.05), while difference signi cant with 30cm (p<0.05).…”

Section: Soil Temperature During Freezing-thawing Processmentioning

confidence: 84%

“…The temperature of each layer in the thawing period was the opposite of the freezing period, with the highest soil temperature at 2 cm and 5 cm, followed by 15 cm and the lowest at 30 cm. Soil temperature changes were atter with increasing depth during thawing, surface soil temperature was more sensitive to air temperature (Sun et al, 2021).…”

Section: Soil Temperature During Freezing-thawing Processmentioning

confidence: 94%

The Study of Migration Mechanism of Soil Water and Salinity during Freezing-thawing Process of Double Ridges Mulching

Zhao

2022

Preprint

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The freezing and thawing process caused soil water and salinity migration from depth to surface that led to massive evaporation and soil salination in spring. Ridges mulching is a very efficient method not only improved soil temperature, restrain evaporation, collected precipitation, but do not affected cultivation. Soil water characteristic curves reveal the relationship of soil water and soil suction, has very important meaning to research soil water migration. The study selected two kinds side mulching methods and one control as objects, the two kinds side mulching methods was weave overlay plastic film and weave, one control was bare soil. van Genuchten (VG) and Brooks and Corey (BC) models were adopted to simulated soil water characteristic curve in the freezing-thawing process. The result showed that VG model has higher simulation accuracy, and the coefficients of determination R2 are above 0.9 and nRMSE are less than 10% for BS, W and FW simulation tests except for W and FW conditions of 5 cm. The soil temperature from 0 to 30 cm depth during freezing was highest in FW, second in W, and lowest in BS. Soil water and salinity have migrated during freezing-thawing process, compared with before freezing, soil water increased from 30 cm depth under bare soil conditions and from 15 cm under mulching cover conditions after the end of freezing-thawing, and the same pattern for soil EC, from 15cm depth under mulching conditions soil EC values increased, the EC values at 15cm depth under bare soil conditions still decreasing. The study achievement can provide a reference for the study of water-salinity migration and water characteristic curves during freezing and thawing of soils in arid and cold regions, and also provide a theoretical basis for soil water conservation, suppression of evaporation from farmland and salinity accumulation in topsoil.

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“…Moreover, previous studies have indicated that soil FTCs occur only when soil water content reaches a threshold value, which may vary with different soil properties, land covers, and climates. 2 , 21 Therefore, another possible reason for the relatively small SM-dominated regions may be that the fluctuation range of SM in some regions did not exceed the threshold.…”

Section: Discussionmentioning

confidence: 99%

“…The initial soil water content determines freeze-thaw processes partly by affecting soil thermal conductivity. 21 Despite a growing number of studies, large uncertainties still exist regarding the crucial drivers of FTC variation, especially in terms of the respective extents of the impacts of T a , SM, and snow cover.…”

Section: Introductionmentioning

confidence: 99%

Shortened duration and reduced area of frozen soil in the Northern Hemisphere

Chen

Han

et al. 2021

The Innovation

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Effect of freeze-thaw processes on soil water transport of farmland in a semi-arid area

Cited by 29 publications

References 32 publications

Effects of Underground Coal Mining on Soil Spatial Water Content Distribution and Plant Growth Type in Northwest China

Effects of Underground Coal Mining on Soil Spatial Water Content Distribution and Plant Growth Type in Northwest China

The Study of Migration Mechanism of Soil Water and Salinity during Freezing-thawing Process of Double Ridges Mulching

Shortened duration and reduced area of frozen soil in the Northern Hemisphere

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