Quantifying the impact of a succession of freezing-thawing cycles on the pore network of a silty clay loam and a loamy sand topsoil using X-ray tomography

Starkloff, Torsten; Larsbo, Mats; Stolte, Jannes; Hessel, Rudi; Ritsema, C.J.

doi:10.1016/j.catena.2017.04.026

Cited by 73 publications

(37 citation statements)

References 36 publications

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“…The freeze–thaw cycle of soil is the result of complex effects of meteorological and environmental conditions on the heat flux of surface water. For many years, investigators have conducted a great deal of research on the effects of snow cover (Iwata et al, 2010; Ling and Zhang, 2003; Osokin et al, 2000; Qiang et al, 2018; Zhang, 2005; Zhou et al, 2013), meteorological factors (Frauenfeld and Zhang, 2011; Guo and Wang, 2014; Hirota et al, 2006; Jafarov et al, 2013; Wang et al, 2015, 2016), topography (Ling et al, 2012; Gao et al, 2016; Lin et al, 2010; Yi et al, 2014), and pore size (De Kock et al, 2015; Starkloff et al, 2017; Watanabe and Kugisaki, 2017) on the soil freezing and thawing process during the seasonal freeze–thaw period. The soil freezing and thawing process has been studied by monitoring methods (Kimball et al, 2004; Kong et al, 2014; Naeimi et al, 2012; Sun et al, 2012; Wu et al, 2016b) and numerical models (Gens et al, 2009; Kojima et al, 2013; Mironov and Karavaysky, 2015; Semenova et al, 2014).…”

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confidence: 99%

Simulation of Soil Freezing and Thawing for Different Groundwater Table Depths

Chen

Gao

Zheng

et al. 2019

Vadose Zone Journal

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Core Ideas The SHAW model was used to simulate the freeze–thaw process during freeze–thaw periods. It revealed the effects of soil texture and groundwater table depth on soil freezing and thawing. The frost depth and accumulated negative soil surface temperature relationship was determined. During freeze–thaw periods, the transformation between phreatic water and soil water will change the soil hydrothermal properties and affect the soil freezing and thawing in shallow groundwater areas. The purpose of this study was to determine the effect of four different groundwater table depths (GTDs) and two soil textures on the process of soil freezing and thawing during two successive freeze–thaw periods using the Simultaneous Heat and Water (SHAW) model. The results show that the frost depth was the maximum when the GTD was 1.0 m, and the maximum frost depths of sandy loam and fine sand were 97.6 and 98.9 cm, respectively. When the GTD was larger than 1.5 m, the maximum frost depth decreased with an increase in GTD, and the maximum frost depth of the soil profile was more sensitive to changes in the air temperature. The frost depth of the soil profile was linear with the square root of the accumulated negative soil surface temperature (ANST) under different GTDs. The ANST was influenced by the phreatic evaporation, and the soil freezing rate increased with an increase in GTD under the same ANST. This research is significant for the rational development of soil water and heat resources and the study of soil water–heat transfer in shallow groundwater areas.

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confidence: 99%

Simulation of Soil Freezing and Thawing for Different Groundwater Table Depths

Chen

Gao

Zheng

et al. 2019

Vadose Zone Journal

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“…The FTC is a key feature of seasonally frozen soil ecosystems. It affects not only the physical and chemical properties of the soil [19][20][21][22][23][24][25][26], but also the survival of the vegetation and microorganisms in the soil [16,17,[27][28][29]. Measuring the impact of FTCs on vegetation and soil is challenging.…”

Section: Freezing-thawing Cycle Index Calculationmentioning

confidence: 99%

“…As the pre-conditions and experimental methods differ between studies, the changes in soil aggregates, porosity, and bulk density vary with different initial conditions. Many scholars have different opinions on the effects of FTCs on the physical properties of soil [23][24][25]. Therefore, this study directly analyzed the response of soil moisture to the FTCF and then analyzed its impact on alpine vegetation.…”

Section: Long-term Fluctuation Analysismentioning

confidence: 99%

“…Frequent low-temperature disturbances can damage vegetation roots and directly affect vegetation growth [16][17][18]. Among the indirect effects of FTC are its impacts on the physical and chemical properties of soil [19][20][21][22][23][24][25][26], microbial communities (including their composition) [27][28][29][30], greenhouse gas emissions [31,32], the soil structure, and the distribution of water and nutrients. As the climate warms, the freezing-thawing cycle mode (FTCM) changes [33][34][35][36] (FTCM is a general term for all characteristics of the FTC), thus affecting vegetation growth characteristics and growth trends; the effect even extends to the entire frozen soil ecosystem.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the volume of the soil water expands when it freezes and decreases when it thaws. These changes decrease the size of the soil aggregates [22,23] and change the soil porosity and bulk density [53]. These effects change the water holding capacity and water conductivity of the soil.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the Freezing–Thawing Cycle Mode on Alpine Vegetation in the Nagqu River Basin of the Qinghai–Tibet Plateau

Man

Weng

Yang

et al. 2019

Water

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The freezing–thawing cycle is a basic feature of a frozen soil ecosystem, and it affects the growth of alpine vegetation both directly and indirectly. As the climate changes, the freezing–thawing mode, along with its impact on frozen soil ecosystems, also changes. In this research, the freezing–thawing cycle of the Nagqu River Basin in the Qinghai–Tibet Plateau was studied. Vegetation growth characteristics and microbial abundance were analyzed under different freezing–thawing modes. The direct and indirect effects of the freezing–thawing cycle mode on alpine vegetation in the Nagqu River Basin are presented, and the changing trends and hazards of the freezing–thawing cycle mode due to climate change are discussed. The results highlight two major findings. First, the freezing–thawing cycle in the Nagqu River Basin has a high-frequency mode (HFM) and a low-frequency mode (LFM). With the influence of climate change, the LFM is gradually shifting to the HFM. Second, the alpine vegetation biomass in the HFM is lower than that in the LFM. Frequent freezing–thawing cycles reduce root cell activity and can even lead to root cell death. On the other hand, frequent freezing–thawing cycles increase microbial (Bradyrhizobium, Mesorhizobium, and Pseudomonas) death, weaken symbiotic nitrogen fixation and the disease resistance of vegetation, accelerate soil nutrient loss, reduce the soil water holding capacity and soil moisture, and hinder root growth. This study provides a complete response mechanism of alpine vegetation to the freezing–thawing cycle frequency while providing a theoretical basis for studying the change direction and impact on the frozen soil ecosystem due to climate change.

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