Soil microbial distribution and assembly are related to vegetation biomass in the alpine permafrost regions of the Qinghai-Tibet Plateau

Wu, Minghui; Xue, Kai; Wei, Peijie; Jia, Yinglan; Chen, Sheng-Yun

doi:10.1016/j.scitotenv.2022.155259

Cited by 42 publications

(16 citation statements)

References 84 publications

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“…The results of the current study revealed that, with grass variations from the alpine swamp meadow to the steppe, soil nutrients, plant biomass and coverage all decreased, in accordance with the increasing temperature and decreasing altitude ( Table 1 ). This result was consistent with previous studies, which showed that there were significant differences in vegetation community structure among different grassland types, including species, dominant species, and vegetation height, followed by differences in soil environment (Zhang Y. et al, 2016 ; Wu et al, 2022 ). Furthermore, our results showed that soil microbial and grass diversity displayed opposing trends in different grassland types ( Figure 1 ), indicating that the belowground microbial diversity did not coincide with aboveground grass diversity in the TRH region.…”

Section: Discussionsupporting

confidence: 93%

“…In alpine regions, due to the long-term effects of climate warming (Wu et al, 2022 ) and overgrazing (Wang H. et al, 2019 ), which further promotes the change of alpine grassland plant community (Luo et al, 2019 ; Mu et al, 2020 ). Changes in plant diversity are known to affect above- and below-ground ecosystem functioning, including diversity of below communities of other organisms (Tilman et al, 2001 ; Heemsbergen et al, 2004 ).…”

Section: Introductionmentioning

confidence: 99%

“…Soil microbial communities are involved in regulating many ecological processes. Some studies showed that negative frequency-dependent growth of plant populations detrimentally affected by soil microbial communities helps maintain plant diversity in various communities, including old fields (Pendergast et al, 2013 ), tropical forests (Mangan et al, 2010 ; Liu et al, 2021 ), and grasslands (Wu et al, 2022 ). Spatial variation in the soil microbial community can lead to variation in plant productivity (van der Heijden et al, 2008 ) and affect the outcome of plant restoration (Wubs et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

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Grass-microbial inter-domain ecological networks associated with alpine grassland productivity

et al. 2023

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Associations between grasses and soil microorganisms can strongly influence plant community structures. However, the associations between grass productivity and diversity and soil microbes, as well as the patterns of co-occurrence between grass and microbes remain unclear. Here, we surveyed grass productivity and diversity, determined soil physicochemical, and sequenced soil archaea, bacteria and fungi by metabarcoding technology at 16 alpine grasslands. Using the Distance-decay relationship, Inter-Domain Ecological Network (IDEN), and Mantel tests, we investigated the relationship between grass productivity, diversity and microbial diversity, and the patterns of co-occurrence between grass and microbial inter-domain network in alpine grassland. We found the archaea richness, bacteria richness and Shannon, and fungi α-diversity were significantly negatively correlation with grass diversity, but archaea and bacteria diversity were positively correlation with grass productivity. Moreover, an increase in microbial β-diversity was observed along with increased discrepancy in grass diversity and productivity and soil variables. Variance partitioning analysis suggested that the contribution of grass productivity on microbial community was higher than that of soil variables and grass diversity, which implies that microbial community was more related to grass productivity. Inter-Domain Ecological Network showed that the grass species formed complex and stable ecological networks with some bacterial, archaeal, and fungal species, and the grass-fungal ecological networks showed the highest robustness, which indicated that soil fungi could better co-coexist with aboveground grass in alpine grasslands. Besides, the connectivity degrees of the grass-microbial network were significantly positively correlated with grass productivity, suggesting that the coexistence pattern of grasses and microbes had a positive feedback effect on the grass productivity. The results are important for establishing the regulatory mechanisms between plants and microorganisms in alpine grassland ecosystems.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Grass-microbial inter-domain ecological networks associated with alpine grassland productivity

et al. 2023

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“…Therefore, this study analyzed the effects of DFTCs on topsoil bacteria of the active layer and surface greenhouse gas fluxes by in-situ experiments in the permafrost regions of the Shule River headwaters on the western part of Qilian Mountains, northeast margin of the QTP. Our results demonstrated that the composition of soil bacteria in phyum level remained unchanged in the permafrost regions after two DFTCs, consisting mainly of Proteobacteria , Acidobacteria , Actinobacteria , Chloroflexi , and Gemmatimonadetes ( Figure 2 ), which were in agreement with the results of previous studies ( Zhang et al, 2014 ; Wu et al, 2022 ). This indicated that the same soil environment had similar bacterial community composition.…”

Section: Discussionsupporting

confidence: 93%

Effects of autumn diurnal freeze–thaw cycles on soil bacteria and greenhouse gases in the permafrost regions

Chen

et al. 2022

Front. Microbiol.

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Understanding the impacts of diurnal freeze–thaw cycles (DFTCs) on soil microorganisms and greenhouse gas emissions is crucial for assessing soil carbon and nitrogen cycles in the alpine ecosystems. However, relevant studies in the permafrost regions in the Qinghai-Tibet Plateau (QTP) are still lacking. In this study, we used high-throughput pyrosequencing and static chamber-gas chromatogram to study the changes in topsoil bacteria and fluxes of greenhouse gases, including carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O), during autumn DFTCs in the permafrost regions of the Shule River headwaters on the western part of Qilian Mountains, northeast margin of the QTP. The results showed that the bacterial communities contained a total of 35 phyla, 88 classes, 128 orders, 153 families, 176 genera, and 113 species. The dominant phyla were Proteobacteria, Acidobacteria, Actinobacteria, Chloroflexi, and Gemmatimonadetes. Two DFTCs led to a trend of increasing bacterial diversity and significant changes in the relative abundance of 17 known bacteria at the family, genus, and species levels. These were predominantly influenced by soil temperature, water content, and salinity. In addition, CO2 flux significantly increased while CH4 flux distinctly decreased, and N2O flux tended to increase after two DFTCs, with soil bacteria being the primary affecting variable. This study can provide a scientific insight into the impact of climate change on biogeochemical cycles of the QTP.

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“…Alpine grassland resources provide important global ecological and social service functions by storing carbon, as well as supporting biodiversity (Yao et al 2019). Under climate warming, Alpine grassland is experiencing warming at a level that is approximately double the global average, which leads to a succession of vegetation types and changes in related soil functions (Wu et al 2022). It is also generally accepted that Alpine grassland on the Qinghai-Tibet Plateau tends to succession towards a drier ecosystem upon the thaw of permafrost, going from alpine swamp meadow to meadow, steppe, and desert ecology (Qin and Ding 2009).…”

Section: Introductionmentioning

confidence: 99%

Changes in soil fungal community composition and functional groups during the succession of Alpine grassland

Zhao

Yin²,

Li³

et al. 2022

Plant Soil

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Aims This study explored the trends in soil fungal patterns and their responses to carbon and nitrogen during the succession in Alpine grassland in the Qilian Mountain area. Methods Illumina sequencing of ITS genes was used to characterize the soil fungal construct, and the FUNGuild database to predict functional groups in Alpine grassland succession from swamp meadow to alpine meadow, steppe meadow. Soil carbon and nitrogen, vegetation carbon and nitrogen, and soil enzyme activity were also investigated. ResultsThe soil fungal OTUs increased with succession in the rst stages but then reached a relatively stable state in the second successional stages. The sobs and Chao1 index showed the same trend as OTUS during succession. And there are signi cant differences in fungal community structure among different succession stages. During succession, most phyla showed linear decreases trends; whereas Ascomycota showed linear increases. The relative abundance of Pathotroph and Saprotroph of fungal functional increased with the successional stages, while the Symbiotroph had no change during succession. We also found that NH4 + -N is the dominating factor, which affects the structure of fungal community across all successional stages, and soil microbial carbon has the greatest in uence on the variation of functional communities.Conclusions Our ndings indicate that the community dramatically shifted with succession in the rst stages but then reached a relatively stable state in the second successional stages, while the soil fungal function group did not follow this rule. NH4 + -N and soil microbial carbon had the greatest in uence on the community and function of fungi, respectively.

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Soil microbial distribution and assembly are related to vegetation biomass in the alpine permafrost regions of the Qinghai-Tibet Plateau

Cited by 42 publications

References 84 publications

Grass-microbial inter-domain ecological networks associated with alpine grassland productivity

Grass-microbial inter-domain ecological networks associated with alpine grassland productivity

Effects of autumn diurnal freeze–thaw cycles on soil bacteria and greenhouse gases in the permafrost regions

Changes in soil fungal community composition and functional groups during the succession of Alpine grassland

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