The Impact of Freeze‐Thaw History on Soil Carbon Response to Experimental Freeze‐Thaw Cycles

Rooney, Erin; Bailey, Vanessa; Patel, Kaizad; Possinger, Angela R.; Gallo, Adrian C.; Bergmann, Maya; SanClements, Michael D.; Lybrand, Rebecca A.

doi:10.1029/2022jg006889

Cited by 10 publications

(4 citation statements)

References 75 publications

(124 reference statements)

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“…Furthermore, our study found that the daily average Rs flux during IFP was relatively low compared to those in DFP and SMP, indicating that the non-growing-season soil CO 2 emissions via Rs were mainly concentrated in DFP and SMP. We also observed a significant increase in Rs after soil thawing, which was in line with previous findings [44][45][46]. The pattern of increased Rs after soil thawing during SMP may reflect the emergence of suitable abiotic or biotic conditions favorable for microbial and root respiration at the end of winter, such as appropriate soil temperature and moisture, restoration of the growth of plant roots [44,47], as well as increased soil microbial activity [44,46].…”

Section: Soil Respiration Under Different Snow Cover Treatmentssupporting

confidence: 90%

“…The pattern of increased Rs after soil thawing during SMP may reflect the emergence of suitable abiotic or biotic conditions favorable for microbial and root respiration at the end of winter, such as appropriate soil temperature and moisture, restoration of the growth of plant roots [44,47], as well as increased soil microbial activity [44,46]. In addition, the surge in Rs from thawed soil at the end of the non-growing season may also be caused by the rapid release of carbon dioxide stored in soil during the freezing period after the melting of the ice layer [45,48].…”

Section: Soil Respiration Under Different Snow Cover Treatmentsmentioning

confidence: 99%

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Response of Soil Respiration to Altered Snow Cover in a Typical Temperate Grassland in China

Liu,

Peng

2023

Agriculture

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The snow cover in temperate areas is undergoing significant changes, which may affect soil respiration (Rs), the second largest carbon flux in global carbon cycling. However, currently, there are relatively few in situ field studies on the effects of altered snow cover on Rs in temperate areas during the non-growing season compared to the research on Rs during the growing season. Therefore, it limited the accurate prediction of the characteristics and magnitude of changes in soil carbon emissions in temperate areas under global change scenarios. Here, an in situ field experiment was conducted in a typical grassland in Inner Mongolia in China to explore the characteristics of Rs under three different snow cover treatments, i.e., increasing snow (IS), decreasing snow (DS), and ambient snow that was regarded as the control check treatment (CK). The results showed that the range of Rs flux and cumulative emission flux in all treatments in the non-growing season in the study area ranged from 5.87 ± 0.20 to 55.11 ± 6.42 mg CO2 m−2 h−1 and from 22.81 ± 0.68 to 26.36 ± 0.41 g C m−2, respectively. During the observation period, the depth of the largest snow cover for each treatment did not exceed 18 cm, and none of the snow treatments caused significant variations in Rs flux (p > 0.05). However, the cumulative flux of Rs in the whole non-growing season was only stimulated significantly by 15.6% by the IS treatment compared with that of CK. The relatively high Rs flux in the non-growing season was observed to mainly occur in the soil deeply frozen period (DFP) and the soil melting period (SMP). Further analysis revealed that Rs flux under different snow treatments were mainly positively correlated with soil temperature during SMP. The main factors controlling Rs varied with different sampling periods. Our findings suggest that the non-growing season is also an important period of non-negligible carbon emissions from typical grassland soils in temperate zones.

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Section: Soil Respiration Under Different Snow Cover Treatmentssupporting

confidence: 90%

Section: Soil Respiration Under Different Snow Cover Treatmentsmentioning

confidence: 99%

Response of Soil Respiration to Altered Snow Cover in a Typical Temperate Grassland in China

Liu,

Peng

2023

Agriculture

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“…One possible reason is that in the permafrost studied by Payandi-Rolland et al (2021), the microbial communities are resistant to FTCs. Previous studies reported that the microbes in a variety of soil types are highly susceptible to the first freeze-thaw cycle, and then less affected by subsequent freeze-thaw cycles (Koponen et al, 2006;Song et al, 2017;Patel et al, 2021;Rooney et al, 2022). The different climate regions and peatland types (temperate fen grasslands vs. permafrost bogs) may be responsible for the different changes in DOC concentrations after FTCs.…”

Section: Impact Of Freeze-thaw Cycles On Flow Rates Dissolved Organic...mentioning

confidence: 99%

Freeze-thaw cycles alter soil hydro-physical properties and dissolved organic carbon release from peat

Liu

Rezanezhad²,

Žák³

et al. 2022

Front. Environ. Sci.

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The ongoing climate warming is likely to increase the frequency of freeze-thaw cycles (FTCs) in cold-temperate peatland regions. Despite the importance of soil hydro-physical properties in water and carbon cycling in peatlands, the impacts of FTCs on peat properties as well as carbon sequestration and release remain poorly understood. In this study, we collected undisturbed topsoil samples from two drained lowland fen peatlands to investigate the impact of FTCs on hydro-physical properties as well as dissolved organic carbon (DOC) fluxes from peat. The soil samples were subject to five freeze-thaw treatments, including a zero, one, three, five, ten cycles (FTC0, FTC1, FTC3, FTC5, and FTC10, respectively). Each FTC was composed of 24 h of freezing (−5°C) and 24 h of thawing (5°C) and the soil moisture content during the freeze-thaw experiment was adjusted to field capacity. The results showed that the FTCs substantially altered the saturated hydraulic conductivity (Ks) of peat. For peat samples with low initial Ks values (e.g., < 0.2 × 10−5 m s−1), Ks increased after FTCs. In contrast, the Ks of peat decreased after freeze-thaw, if the initial Ks was comparably high (e.g., > 0.8 × 10−5 m s−1). Overall, the average Ks values of peatlands decreased after FTCs. The reduction in Ks values can be explained by the changes in macroporosity. The DOC experiment results revealed that the FTCs could increase DOC concentrations in leachate, but the DOC fluxes decreased mainly because of a reduction in water flow rate as well as Ks. In conclusion, soil hydraulic properties of peat (e.g., Ks) are affected by freezing and thawing. The dynamics of soil hydraulic properties need to be explicitly addressed in the quantification and modelling of the water flux and DOC release from peatlands.

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“…Consequently, it is imperative to consider the significant impact of freeze–thaw cycles (F-Ts) on the mechanical performance and durability of CGC. Extensive research has been conducted on the deterioration patterns of CGC under F-Ts conditions, elucidating the macroscopic mechanical effects of F-Ts on CGC [ 27 , 28 , 29 ]. Under F-Ts conditions, concrete materials undergo two main changes.…”

Section: Introductionmentioning

confidence: 99%

Multi-Scale Analysis of the Damage Evolution of Coal Gangue Coarse Aggregate Concrete after Freeze–Thaw Cycle Based on CT Technology

Xin,

Yang,

Yang

et al. 2024

Materials

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This study utilized X-ray computed tomography (CT) technology to analyze the meso-structure of concrete at different replacement rates, using a coal gangue coarse aggregate, after experiencing various freeze–thaw cycles (F-Ts). A predictive model for the degradation of the elastic modulus of Coal Gangue coarse aggregate Concrete (CGC), based on mesoscopic damage, was established to provide an interpretation of the macroscopic mechanical behavior of CGC after F-Ts damage at a mesoscopic scale. It was found that after F-Ts, the compressive strength of concrete, with coal gangue replacement rates of 30%, 60%, and 100%, respectively, decreased by 33.76%, 34.89%, and 42.05% compared with unfrozen specimens. The results indicate that an increase in the coal gangue replacement rate exacerbates the degradation of concrete performance during the F-Ts process. Furthermore, the established predictive formula for elastic modulus degradation closely matches the experimental data, offering a reliable theoretical basis for the durability design of CGC in F-Ts environments.

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The Impact of Freeze‐Thaw History on Soil Carbon Response to Experimental Freeze‐Thaw Cycles

Abstract: Freeze-thaw cycles are a deformation process that shape soil function in warming permafrost landscapes and represent an intrinsic component of thaw (

Cited by 10 publications

References 75 publications

Response of Soil Respiration to Altered Snow Cover in a Typical Temperate Grassland in China

Response of Soil Respiration to Altered Snow Cover in a Typical Temperate Grassland in China

Freeze-thaw cycles alter soil hydro-physical properties and dissolved organic carbon release from peat

Multi-Scale Analysis of the Damage Evolution of Coal Gangue Coarse Aggregate Concrete after Freeze–Thaw Cycle Based on CT Technology

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