The relationships of present vegetation, bacteria, and soil properties with soil organic matter characteristics in moist acidic tundra in Alaska

Nam, Sang Heon; Alday, Josu G.; Kim, Min‐Cheol; Kim, Hye Min; Kim, Yongkang; Park, Taesung; Lim, Hyoun Soo; Lee, Bang Yong; Lee, Yoo Kyung; Jung, Jae Chang

doi:10.1016/j.scitotenv.2021.145386

Cited by 16 publications

(14 citation statements)

References 77 publications

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“…In the present study, LEfSe and ANOVA analyses displayed that the soil bacterial community composition was transformed from oligotrophic groups (e.g., Actinobacteria, Firmicutes, and Cyanobacteria) to copiotrophic groups (e.g., Proteobacteria) following old-field succession (Figure 3, Figure 4 and Figure S2). Oligotrophic bacteria have been shown to favor the decay of recalcitrant organic materials [36,69,86]. For instance, Barka et al (2016) reported that Actinobacteria have the capacity to degrade highly recalcitrant organic compounds through the penetration of their hypha into plant tissues [69].…”

Section: Discussionmentioning

confidence: 99%

“…For instance, Barka et al (2016) reported that Actinobacteria have the capacity to degrade highly recalcitrant organic compounds through the penetration of their hypha into plant tissues [69]. Chloroflexi plays a central role in degradation of recalcitrant matter (e.g., aromatics, Ncontaining, and phenolic compounds) [86]. Lladó et al (2017) revealed that Firmicutes have the ability to utilize recalcitrant C [36].…”

Section: Discussionmentioning

confidence: 99%

“…It may be postulated that the climax forest possessed the most abundant copiotrophic Proteobacteria, and less oligotrophic Chloroflexi, Gemmatimonadetes, and Actinobacteria relative to farmland stage (Figure 3). This might promote the SOC and SON accumulation by increasing utilization of labile organic C and N, while decelerating the decomposition of recalcitrant organic C and N following old-field succession (Table S2) [69,72,86].…”

Section: Discussionmentioning

confidence: 99%

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Increased Soil Bacterial Abundance but Decreased Bacterial Diversity and Shifted Bacterial Community Composition Following Secondary Succession of Old-Field

Yang

Cai²,

Wang³

et al. 2022

Forests

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Plant secondary succession is a very effective approach for the rejuvenation of degraded ecosystems. In order to comprehend alterations and driving mechanisms of soil bacterial communities under secondary succession of old-field and reveal their subsequent impacts on the decomposition and accumulation of soil organic carbon (SOC) and nitrogen (SON), we investigated changes in soil bacterial communities following ~160 years of old-field succession on the Loess Plateau of China through analyses of quantitative polymerase chain reaction (qPCR) and Illumina MiSeq DNA sequencing of 16S rRNA genes. Our results revealed that subsequent to secondary succession of old-field, soil bacterial abundance progressively increased, while bacterial richness and diversity significantly decreased. Principal component analysis and Bray–Curtis similarity index showed that bacterial community composition gradually shifted following old-field succession. Specifically, the relative abundances of Proteobacteria, Rokubacteria, and Verrucomicrobia progressively increased, while Actinobacteria and Firmicutes slightly decreased following old-field succession. The most enriched of Proteobacteria (e.g., Rhizobiales, Xanthobacteraceae, Gammaproteobacteria, Bradyrhizobium, Rhizobiaceae, and Mesorhizobiur) were found in a climax forest, while Chloroflexi and Gemmatimonadetes had the lowest relative abundances. Further, the most enriched members of Actinobacteria, including Geodermatophilaceae, Frankiales, Blastococcus, Micrococcales, Micrococcacea, Propionibacteriales, Nocardioidaceae, Nocardioide, and Streptomycetaceae, were exhibited in the farmland stage. Our results suggested that secondary succession of old-field greatly modified soil bacterial communities via the transformation of soil nutrients levels, altering plant biomass and soil physiochemical properties. Soil bacterial community composition was transformed from oligotrophic groups to copiotrophic Proteobacteria following old-field succession, which may promote SOC and SON accumulation through increasing the utilization of labile organic carbon (C) and nitrogen (N), while decreasing decomposition of recalcitrant organic C and N from the early- to late-successional stages.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Increased Soil Bacterial Abundance but Decreased Bacterial Diversity and Shifted Bacterial Community Composition Following Secondary Succession of Old-Field

Yang

Cai²,

Wang³

et al. 2022

Forests

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“…1). Annual temperature and precipitation in Council is 2.8°C and 404.1 mm, respectively (Table 1) (Nam et al 2021). Soil is classified as a Histic-Tubic Cryosol (Nam et al 2021).…”

Section: Sampling Sitementioning

confidence: 99%

“…Annual temperature and precipitation in Council is 2.8°C and 404.1 mm, respectively (Table 1) (Nam et al 2021). Soil is classified as a Histic-Tubic Cryosol (Nam et al 2021). Cambridge Bay, Nunavut in Canada is located in southeast coast in Victo- ) is in northeast Greenland (Fig.…”

Section: Sampling Sitementioning

confidence: 99%

Soil properties and molecular compositions of soil organic matter in four different Arctic regions

2022

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Background:The Arctic permafrost stores enormous amount of carbon (C), about one third of global C stocks. However, drastically increasing temperature in the Arctic makes the stable frozen C stock vulnerable to microbial decomposition. The released carbon dioxide from permafrost can cause accelerating C feedback to the atmosphere. Soil organic matter (SOM) composition would be the basic information to project the trajectory of C under rapidly changing climate. However, not many studies on SOM characterization have been done compared to quantification of SOM stocks. Thus, the purpose of our study is to determine soil properties and molecular compositions of SOM in four different Arctic regions. We collected soils in different soil layers from 1) Cambridge Bay, Canada, 2) Council, Alaska, USA, 3) Svalbard, Norway, and 4) Zackenberg, Greenland. The basic soil properties were measured, and the molecular composition of SOM was analyzed through pyrolysis-gas chromatography/mass spectrometry (py-GC/MS). Results: The Oi layer of soil in Council, Alaska showed the lowest soil pH and the highest electrical conductivity (EC) and SOM content. All soils in each site showed increasing pH and decreasing SOC and EC values with soil depth. Since the Council site was moist acidic tundra compared to other three dry tundra sites, soil properties were distinct from the others: high SOM and EC, and low pH. Through the py-GC/MS analysis, a total of 117 pyrolysis products were detected from 32 soil samples of four different Arctic soils. The first two-axis of the PCA explained 38% of sample variation. While short-and mid-hydrocarbons were associated with mineral layers, lignins and polysaccharides were linked to organic layers of Alaska and Cambridge Bay soil. Conclusions: We conclude that the py-GC/MS results separated soil samples mainly based on the origin of SOM (plants-or microbially-derived). This molecular characteristics of SOM can play a role of controlling SOM degradation to warming. Thus, it should be further investigated how the SOM molecular characteristics have impacts on SOM dynamics through additional laboratory incubation studies and microbial decomposition measurements in the field.

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Acidobacteria members harbour an abundant and diverse carbohydrate-active enzymes (cazyme) and secreted proteasome repertoire, key factors for potential efficient biomass degradation

Coluccia,

Besaury

2023

Mol Genet Genomics

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The relationships of present vegetation, bacteria, and soil properties with soil organic matter characteristics in moist acidic tundra in Alaska

Cited by 16 publications

References 77 publications

Increased Soil Bacterial Abundance but Decreased Bacterial Diversity and Shifted Bacterial Community Composition Following Secondary Succession of Old-Field

Increased Soil Bacterial Abundance but Decreased Bacterial Diversity and Shifted Bacterial Community Composition Following Secondary Succession of Old-Field

Soil properties and molecular compositions of soil organic matter in four different Arctic regions

Acidobacteria members harbour an abundant and diverse carbohydrate-active enzymes (cazyme) and secreted proteasome repertoire, key factors for potential efficient biomass degradation

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