Changes in Soil C:N:P Stoichiometry and Microbial Structure along Soil Depth in Two Forest Soils

Hu, Lei; LuJi, Ade; Wu, Xinwei; Zi, Hongbiao; Luo, Xi; Wang, Changting

doi:10.3390/f10020113

Cited by 25 publications

(17 citation statements)

References 24 publications

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“…The lower availability of phosphorus in the subsoil than in the topsoil could be attributed to the low solubility of phosphorus in slightly alkaline soils (El‐Baruni & Olsen, ), again affecting the vertical patterns through our 20‐m‐deep soil profile. The decrease in microbial biomass carbon with soil depth was also consistent with previous studies (Eilers et al, ; Hu et al, ; Zhang et al, ), that is, microbial biomass carbon decreased drastically from the surface soil to a depth of 1 m of the subsoil, and then the change kept relatively steady in deep soils thereafter (Eilers et al, ). The excessive depletion of water in deep soils in R .…”

Section: Discussionsupporting

confidence: 90%

Vertical changes in bacterial community composition down to a depth of 20 m on the degraded Loess Plateau in China

et al. 2020

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Soil microbes are involved in the fundamental processes that underpin an ecosystem's function. However, little is known about the microbial communities that inhabit deep soil horizons, especially in degraded forest ecosystems. Here, we used high‐throughput sequencing to investigate the vertical distribution of soil bacterial communities to a depth of 20 m in Pinus tabulaeformis and Robinia pseudoacacia forests on the Loess Plateau, China. We found that bacterial richness declined from the topsoil to a depth of 2 m in P. tabulaeformis forests and declined from the topsoil to a depth of 1 m in R. pseudoacacia forests, and thereafter increased. The relative abundance of α‐Proteobacteria was higher in subsoils than in topsoils of P. tabulaeformis forests. It was highest at the depth of 20 or 14 m in both forest types, suggesting that α‐Proteobacteria can survive dry, alkaline, low‐nutrient environments. We also found a higher relative abundance of Acidobacteria in topsoils than in subsoils, indicating that Acidobacteria can grow well in nutrient‐rich environments. Our results suggest that soil bacterial communities respond to nutrient changes associated with soil depth and plant species. These findings revealed that soil microorganisms persisted in deep and carbon‐starved soils, especially for α‐Proteobacteria, which may be adapted to resource‐poor environments in deep soils.

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Section: Discussionsupporting

confidence: 90%

Vertical changes in bacterial community composition down to a depth of 20 m on the degraded Loess Plateau in China

et al. 2020

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“…Organic C content typically declines with soil depth because of reduced nutrient input from plant litter and root exudates (Fierer et al, 2003). The decrease in microbial biomass, measured in our study as DNA content, with increasing soil depth was also consistent with results from previous studies (Eilers et al, 2012;Hu et al, 2019;Zhang et al, 2019). At our forest sites, DNA content decreased FIGURE 6 | Differentially abundant fungal genera of topsoil (soil layers L1 and L2) vs. subsoil (soil layers L5 and L6).…”

Section: Soil Physicochemical Variables Affect Microbial Community Structuressupporting

confidence: 90%

Deep Soil Layers of Drought-Exposed Forests Harbor Poorly Known Bacterial and Fungal Communities

et al. 2021

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Soil microorganisms such as bacteria and fungi play important roles in the biogeochemical cycling of soil nutrients, because they act as decomposers or are mutualistic or antagonistic symbionts, thereby influencing plant growth and health. In the present study, we investigated the vertical distribution of the soil microbiome to a depth of 2 m in Swiss drought-exposed forests of European beech and oaks on calcareous bedrock. We aimed to disentangle the effects of soil depth, tree (beech, oak), and substrate (soil, roots) on microbial abundance, diversity, and community structure. With increasing soil depth, organic carbon, nitrogen, and clay content decreased significantly. Similarly, fine root biomass, microbial biomass (DNA content, fungal abundance), and microbial alpha-diversity decreased and were consequently significantly related to these physicochemical parameters. In contrast, bacterial abundance tended to increase with soil depth, and the bacteria to fungi ratio increased significantly with greater depth. Tree species was only significantly related to the fungal Shannon index but not to the bacterial Shannon index. Microbial community analyses revealed that bacterial and fungal communities varied significantly across the soil layers, more strongly for bacteria than for fungi. Both communities were also significantly affected by tree species and substrate. In deep soil layers, poorly known bacterial taxa from Nitrospirae, Chloroflexi, Rokubacteria, Gemmatimonadetes, Firmicutes and GAL 15 were overrepresented. Furthermore, archaeal phyla such as Thaumarchaeota and Euryarchaeota were more abundant in subsoils than topsoils. Fungal taxa that were predominantly found in deep soil layers belong to the ectomycorrhizal Boletus luridus and Hydnum vesterholtii. Both taxa are reported for the first time in such deep soil layers. Saprotrophic fungal taxa predominantly recorded in deep soil layers were unknown species of Xylaria. Finally, our results show that the microbial community structure found in fine roots was well represented in the bulk soil. Overall, we recorded poorly known bacterial and archaeal phyla, as well as ectomycorrhizal fungi that were not previously known to colonize deep soil layers. Our study contributes to an integrated perspective on the vertical distribution of the soil microbiome at a fine spatial scale in drought-exposed forests.

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“…Soil C, N, and P contents and stoichiometry vary with depths (Hu et al 2019), therefore, under-standing how variations in physicochemical characteristics along the soil pro le shape microorganism communities is essential to understanding the below-ground ecological processes. Previous studies revealed that soil microbial communities are determined by several abiotic factors (Andersen et al 2013 (Lamit et al 2017) were factors that affecting microbial communities.…”

Section: Introductionmentioning

confidence: 99%

Variations in bacterial and archaeal community structure and diversity along the soil profiles of a peatland in Southwest China

Luo

Shi

et al. 2021

Environ Sci Pollut Res

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As bacteria and archaea are key components in the ecosystem, their alterations along soil pro les are important in understanding the biogeochemical cycles in peatland. However, little is known about the vertical distribution patterns of bacteria and archaea along the Bitahai peatland, as well as their relationship to soil chemical properties. Here, sequencing of 16S rRNA genes (Illumina, MiSeq) was used to analyze bacterial and archaeal abundance, diversity, and composition across 0-100 cm of the soil. Soil pH, total C, N, and P concentrations and stoichiometric ratios also were estimated. Results revealed that total C and total N contents, as well as C:P and N:P ratios, signi cantly increased with increasing peatland depths, while total P decreased. The top three dominant phyla were Proteobacteria (39.64%), Acidobacteria (12.93%), and Chloro exi (12.81%) in bacterial communities, and were Crenarchaeota (58.67%), Thaumarchaeota (14.34%), and Euryarchaeota (10.82%) in archaeal communities in the Bitahai peatland, respectively. The total relative abundance of the methanogenic groups and ammonia-oxidizing microorganisms all signi cantly decreased with soil depths. Both bacterial and archaeal diversity were greatly affected by the soil depths. Soil C, N, and P concentrations and stoichiometric ratios markedly impacted the community structure and diversity just in archaea, not in bacteria. Therefore, these results highlighted that the microbial community structure and diversity depended on soil depths, and the affecting factors for bacteria and archaea were different in the peatlands.

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Changes in Soil C:N:P Stoichiometry and Microbial Structure along Soil Depth in Two Forest Soils

Cited by 25 publications

References 24 publications

Vertical changes in bacterial community composition down to a depth of 20 m on the degraded Loess Plateau in China

Vertical changes in bacterial community composition down to a depth of 20 m on the degraded Loess Plateau in China

Deep Soil Layers of Drought-Exposed Forests Harbor Poorly Known Bacterial and Fungal Communities

Variations in bacterial and archaeal community structure and diversity along the soil profiles of a peatland in Southwest China

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