Permafrost thawing exhibits a greater influence on bacterial richness
and community structure than permafrost age in Arctic permafrost
soils

Ji, Mukan; Kong, Weidong; Liang, Chao; Zhou, Tianqi; Jia, Hongzeng; Dong, Xiaobin

doi:10.5194/tc-2020-39

Cited by 2 publications

(2 citation statements)

References 42 publications

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“…In our study, the bacterial community diversity varied significantly between the active layer and permafrost layer. Studies in the Canadian High Arctic (Jansson & Taş, 2014), Alaskan Arctic (Ji et al, 2020), and Siberian (Belov et al, 2020) permafrost confirmed that the soil microbial diversity was highest in the active layer and decreased with depth in the permafrost layer. Compared with the active layer, the permafrost layer exhibits several unique characteristics, including low temperatures, low oxygen levels, and low water availability.…”

Section: Discussionmentioning

confidence: 92%

Vertical distribution of bacterial community diversity in the Greater Khingan Mountain permafrost region

Cui

et al. 2022

Ecology and Evolution

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Soil microorganisms are crucial contributors to the function of permafrost ecosystems, as well as the regulation of biogeochemical cycles. However, little is known about the distribution patterns and drivers of high‐latitude permafrost microbial communities subject to climate change and human activities. In this study, the vertical distribution patterns of soil bacterial communities in the Greater Khingan Mountain permafrost region were systematically analyzed via Illumina Miseq high‐throughput sequencing. Bacterial diversity in the active layer was significantly higher than in the permafrost layer. Principal coordinate analysis (PCoA) indicated that the bacterial community structure in the active layer and the permafrost layer was completely separated. Permutational multivariate analysis of variance (PERMANOVA) detected statistically significant differentiation across the different depths. The relative abundance of the dominant phyla Chloroflexi (17.92%–52.79%) and Actinobacteria (6.34%–34.52%) was significantly higher in the permafrost layer than in the active layer, whereas that of Acidobacteria (4.98%–38.82%) exhibited the opposite trend, and the abundance of Proteobacteria (2.49%–22.51%) generally decreased with depth. More importantly, the abundance of bacteria linked to human infectious diseases was significantly higher in the permafrost layer according to Tax4Fun prediction analysis. Redundancy analysis (RDA) showed that ammonium nitrogen (NH4+‐N), total organic carbon (TOC), and total phosphorus (TP) were major factors affecting the bacterial community composition. Collectively, our findings provide insights into the soil bacterial vertical distribution patterns and major environmental drivers in high‐latitude permafrost regions, which is key to grasping the response of cold region ecosystem processes to global climate changes.

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Section: Discussionmentioning

confidence: 92%

Vertical distribution of bacterial community diversity in the Greater Khingan Mountain permafrost region

Cui

et al. 2022

Ecology and Evolution

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“…This nding further suggest gas hydrate release is an important source of methane emission from wetland soils in Qilian Mountain permafrost. During spring and summer, soil temperature increase and permafrost thawing promoted ourishly growing of wetland organisms and exponentially incresing of microbial communities [37][38][39] , which can lead to an increase in biogenic methane emision. Simultaneously, the permafrost started to thaw after the soil temperautre above 0℃ in the late spring and the thawing depth peaked in July and August.…”

Section: Discussionmentioning

confidence: 99%

Carbon Isotopic Evidences for Gas Hydrate Release and Its Significance on Seasonal Wetland Methane Emissions in the Qilian Mountains Permafrost

li¹,

Xing²,

Pang³

et al. 2021

Preprint

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Wetland methane emissions in the permafrost regions of the Qinghai-Tibet Plateau is more sensitive to climate warming and can result in a positive climate feedback. Natural gas hydrate, as a potential methane source, may play a pivotal role in wetland methane emission in the permafrost regions. However, it was lacking of evidence. To determine the role of gas hydrate release in wetland methane emission, the two-year field monitoring of methane emitted from a hydrate drilling well, in near-surface soil free gas and low-level air was conducted at a typical gas hydrate reservior in the Qilian Mountains permafrost. The carbon isotope fractionation between CO2 and CH4 (εC) associated with carbon isotopic composition of methane (δ13CCH4) is used as a good tracer to identify methane sources of thermogenic origin or of microbial origin. The monitoring results of the gas hydrate drilling well DK-8 indicated a notable release of the deep gas hydrates occurred in April- May and resulted in the increase of methane content in low-level air. The significance of gas hydrate release in the permafrost region on local wetland methane emission as well as low-level air methane was confirmed by the seasonal variation of methane source of near-surface soil fluxes and low-level air. The thermogenically derived methane were identified as the dominant methane source in autumn and winter compared with increasing contribution of microbially derived methane in summer. The carbon isotopic signatures of tracing methane sources can provide more reliable evidence for gas hydrate release and its effect on the wetland methane emission in the Qilian Mountains permafrost.

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Permafrost thawing exhibits a greater influence on bacterial richness and community structure than permafrost age in Arctic permafrost soils

Cited by 2 publications

References 42 publications

Vertical distribution of bacterial community diversity in the Greater Khingan Mountain permafrost region

Vertical distribution of bacterial community diversity in the Greater Khingan Mountain permafrost region

Carbon Isotopic Evidences for Gas Hydrate Release and Its Significance on Seasonal Wetland Methane Emissions in the Qilian Mountains Permafrost

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