Responses of soil microorganisms, carbon and nitrogen to freeze–thaw cycles in diverse land-use types

Han, Cheng; Gu, Yan-Jie; Kong, Meng; Yu, Jia; Li, Feng Min; Sun, Gang‐Chun; Siddique, Kadambot H. M.

doi:10.1016/j.apsoil.2017.11.012

Cited by 42 publications

(26 citation statements)

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“…In polar and alpine soils, FTCs have been shown to alter the structure of microbial communities (Eriksson et al, 2001;Larsen et al, 2002;Yergeau and Kowalchuk, 2008;Mannisto et al, 2009;Han et al, 2018;Ren et al, 2018), the patterns of microbial substrate utilization (Schimel and Mikan, 2005;Han et al, 2018), and soil ecosystem processes such as C and N mineralization (Larsen et al, 2002;Schimel and Mikan, 2005;Stres et al, 2010;Han et al, 2018). Freezing decreases soil water availability, increases osmotic pressure and causes severe physical damages to the microbial cells (Mazur, 1984;Panoff et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

“…Freezing decreases soil water availability, increases osmotic pressure and causes severe physical damages to the microbial cells (Mazur, 1984;Panoff et al, 1998). This leads to the death of vulnerable microorganisms and, thereupon, to changes in the biomass and composition of the microbial communities (Eriksson et al, 2001;Yergeau and Kowalchuk, 2008;Mannisto et al, 2009;Han et al, 2018;Ren et al, 2018). Furthermore, the alternation between freezing and thawing causes the breaking of soil aggregates (Feng et al, 2007;Wang et al, 2012), which results in the release of labile carbon and nutrient sources in the soil (Feng et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the alternation between freezing and thawing causes the breaking of soil aggregates (Feng et al, 2007;Wang et al, 2012), which results in the release of labile carbon and nutrient sources in the soil (Feng et al, 2007). The preferential consumption of these newly available carbon and nutrients by survivor microorganisms to FTCs often translates to metabolic shifts at the community level, from the degradation of complex organic matter to the utilization of simpler carbon sources (Schimel and Mikan, 2005;Stres et al, 2010;Han et al, 2018). Likewise, FTCs might lead to decreases in the rates of soil respiration and N mineralization, likely because of the decrease in microbial biomass (Larsen et al, 2002;Stres et al, 2010) or alterations in microbial activities (Schimel and Mikan, 2005;Han et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Functional and Structural Responses of Arctic and Alpine Soil Prokaryotic and Fungal Communities Under Freeze-Thaw Cycles of Different Frequencies

2020

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Ongoing climate change involves increasing snow scarcity, which results in more frequent freeze-thaw cycles (FTCs) in polar and alpine soils. Although repeated FTCs have been shown to alter the structure and functions of soil microbial communities, a thorough understanding on the influence of FTCs frequency on polar and especially alpine soil microbiomes is still elusive. Here, we investigated the impact of repeated weekly vs. daily FTC frequencies on the structure and functions of prokaryotic and fungal communities from north-and south-exposed soils from two mountain ridges, one in the Arctic and one in the High-Alps. FTCs affected prokaryotic communities more strongly than fungal communities, where mainly cold-tolerant and opportunistic fungi (e.g., Mrakia, Mortierella) were responsive. Prokaryotic communities were more affected by weekly FTCs than by daily FTCs. Daily FTCs favored fast-growing bacteria (e.g., Arthrobacter), while oligotrophic and largely uncultured taxa (e.g., Verrucomicrobia) benefited from weekly FTCs. FTCs negatively affected microbial respiration but had minor impacts on C-, N-and P-acquiring enzymatic activities. Plausible pre-adaptation of the microbial communities to naturally occurring frequent FTCs at their site of origin did not show a clear influence on the microbial responses to the tested FTCs. Altogether, our study provides an integrative overview on potential structural and functional changes of soil microbial communities in polar and alpine regions in response to the projected increase in FTCs; therefore advancing our understanding on the impact of climate change in these rapidly changing ecosystems.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Functional and Structural Responses of Arctic and Alpine Soil Prokaryotic and Fungal Communities Under Freeze-Thaw Cycles of Different Frequencies

2020

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“…In recent decades, laboratory and field studies have investigated the effects of FTCs on soil processes, albeit with two notable limitations: (a) no consensus as to what exactly constitutes or delimits an FTC and (b) difficulty in elucidating particular FTC characteristics driving such effects on soil processes under field conditions. In general, laboratory studies have shown FTCs to disrupt soil aggregates (Dagesse, 2013; Oztas & Fayetorbay, 2003), modify N 2 O emissions in forest and agricultural systems (Gao et al., 2018; Goldberg, Muhr, Borken, & Gebauer, 2008; Koponen, Flöjt, & Martikainen, 2004; Ruan & Robertson, 2017), alter carbon and nitrogen dynamics in agricultural and grassland systems (Han et al., 2018; Song et al., 2017), and reduce soil water infiltration (Fouli, Cade‐Menun, & Cutforth, 2013). However, a difficulty in simulating and subsequently characterizing realistic FTCs in the laboratory hinders our ability to draw strong conclusions about what would occur under field conditions.…”

Section: Introductionmentioning

confidence: 99%

Novel determination of effective freeze–thaw cycles as drivers of ecosystem change

et al. 2020

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Soil freeze–thaw cycles (FTCs) profoundly influence biophysical conditions and modify biogeochemical processes across many northern‐hemisphere and alpine ecosystems. How FTCs will contribute to global processes in seasonally snow‐covered ecosystems in the future is of particular importance as climate change progresses and winter snowpacks decline. Our understanding of these contributions is limited because there has been little consideration of inter‐ and intrayear variability in the characteristics of FTCs, in part due to a limited appreciation for which of these characteristics matters most with respect to a given biogeochemical process. Here, we introduce the concept of effective FTCs: those that are most likely linked to changes in key soil processes. We also propose a set of parameters to quantify and characterize effective FTCs using standard field soil temperature data. To put these proposed parameters into effective practice, we present FTCQuant, an R package of functions that quantifies FTCs based on a set of user‐defined parameter criteria and, importantly, summarizes the individual characteristics of each FTC counted. To demonstrate the utility of these new concepts and tools, we applied the FTCQuant package to re‐analyze data from two published studies to help explain over‐winter changes to N2O emissions and wet‐aggregate stability. We found that effective FTCs would be defined differently for each of these response variables and that effective FTCs provided a 76 and 33% increase in model fit for wet‐aggregate stability and cumulative N2O emission, respectively, relative to conventional FTC quantification methods focusing on fluctuations around 0 °C. These results demonstrate the importance of identifying effective FTCs when scaling soil processes to regional or global levels. We hope our contributions will inform future deductions, hypothesis generation, and experimentation with respect to expected changes in freeze–thaw cycling globally.

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“…Thus, these nutrients are recycled through termites activities, microbes mineralization and plants absorption. In the process of N mineralization, the carbon part of organic matter is released through respiration which has long been considered as an index of soil metabolism (Han et al 2018;Hammed et al 2019;Rajput et al 2019) and soil carbon sequestration (CO 2 ) (Han et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Effects of termites growth on litter decomposition: a modeling approach

Issoufou

Soumana

Garba

et al. 2019

Int J Recycl Org Waste Agricult

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Purpose Litter decomposition is a biological process resulting from enzymatic activities of microorganisms and influenced in a variety of ways by activities of termites in semi-arid regions. We presented a general model of the decomposition process from litter to carbon sequestration and nitrogen. We aimed at building a termite population growth model which could deal with one substrate. Methods Our model divides the decomposition/growth process at the population level. We put these changes into equations using an analogy with chemical reactions at equilibrium. Results Our findings provide evidence that activities of termites can promote the significant activity of microbial decomposers and increase degradation rates of soil organic matter (SOM). Also, termite activity was probably an additional contributor to the difference between fungus-comb chamber and soil environment, in which the fungus-comb compartment was positively related to carbon and nutrients release. According to the developed, observed differences in decomposition rate, changes were strongly affected by the termite communities' activities in the two types of compartment. Conclusion This functional distinction highlights the importance of termites' activities on microbial activities stimulation through their development featuring their impacts on soil nutrient cycling.

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Responses of soil microorganisms, carbon and nitrogen to freeze–thaw cycles in diverse land-use types

Cited by 42 publications

References 45 publications

Functional and Structural Responses of Arctic and Alpine Soil Prokaryotic and Fungal Communities Under Freeze-Thaw Cycles of Different Frequencies

Functional and Structural Responses of Arctic and Alpine Soil Prokaryotic and Fungal Communities Under Freeze-Thaw Cycles of Different Frequencies

Novel determination of effective freeze–thaw cycles as drivers of ecosystem change

Effects of termites growth on litter decomposition: a modeling approach

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