Competition and habitat filtering jointly explain phylogenetic structure of soil bacterial communities across elevational gradients

Zhang, Qian; Goberna, Marta; Li, Hui; Cui, Ming; Yang, Haishui; Sun, Qing; Insam, Heribert; Zhou, Jinxing

doi:10.1111/1462-2920.14247

Cited by 25 publications

(14 citation statements)

References 64 publications

(119 reference statements)

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“…However, we observed an interesting pattern, namely, that Proteobacteria showed higher relative abundance but smaller sequence number (reflecting absolute abundance) at lower SOC values with higher straw burial depths. This suggests that Proteobacteria have a competition advantage over other bacterial groups (Zhang et al, ). Higher relative abundance of Acidobacteria in sites with straw removal compared with those with straw burial can be explained with the ability of this group to use complex carbon substrates, which has also been found in a previous study (Nemergut et al, ).…”

Section: Discussionmentioning

confidence: 99%

Direct and indirect effects of long‐term ditch‐buried straw return on soil bacterial community in a rice–wheat rotation system

et al. 2019

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Ditch‐buried straw return (DB‐SR) is a novel soil tillage and fertility building practice that is effective in regulating soil carbon and nitrogen dynamics and hydrothermal processes in rice–wheat rotation systems. However, the effects of DB‐SR on soil bacterial community are still largely unclear. We deciphered soil bacterial community with high‐throughput sequencing under various returning approaches, burial depths, and straw amounts after 6.5 years of DB‐SR application. Our results showed that DB‐SR structured distinctive soil bacterial community with rotary tillage straw return (RT‐SR; one‐way analysis of similarities [ANOSIM]: P < .01). RT‐SR significantly reduced soil bacterial diversity by 3.87%, but DB‐SR could maintain it (P > .05). These variations were mainly caused by water content‐driven changes in soil organic carbon. Also, bacterial community composition was distinctive among burial depth treatment (one‐way ANOSIM: P < .05), and deeper burial reduced species richness and diversity (P < .05). Variation in C/N ratio could mostly explain the alterations in soil bacterial community structure under different burial depths. Moreover, the amount of straw buried had no significant effect on soil bacterial species richness or diversity (P > .05), but bacterial community composition was more dissimilar with increasing straw amount (one‐way ANOSIM: P < .01). Our results suggest that long‐term DB‐SR can maintain the bacterial community structure in the surface soil layers when compared with conventional RT‐SR, but taking the current production level into consideration, the burial depth should not be greater than 20 cm for incorporating the full amounts of straws.

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Section: Discussionmentioning

confidence: 99%

Direct and indirect effects of long‐term ditch‐buried straw return on soil bacterial community in a rice–wheat rotation system

et al. 2019

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“…In deterministic processes, not only environmental filtering, but also interspecies interactions have a great influence on community assembly. Ecologists recently accepted that competition and environmental processes act simultaneously (Zhang et al, 2018). In the network analysis, the higher modularity indicates that the network became denser, suggesting that the microbial communities are highly complex (Olesen et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

Deterministic processes dominate soil microbial community assembly in subalpine coniferous forests on the Loess Plateau

Zhao

Bao

Wang

et al. 2019

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Microbial community assembly is influenced by a continuum (actually the trade-off) between deterministic and stochastic processes. An understanding of this ecological continuum is of great significance for drawing inferences about the effects of community assembly processes on microbial community structure and function. Here, we investigated the driving forces of soil microbial community assembly in three different environmental contexts located on subalpine coniferous forests of the Loess Plateau in Shanxi, China. The variation in null deviations and phylogenetic analysis showed that a continuum existed between deterministic and stochastic processes in shaping the microbial community structure, but deterministic processes prevailed. By integrating the results of redundancy analysis (RDA), multiple regression tree (MRT) analysis and correlation analysis, we found that soil organic carbon (SOC) was the main driver of the community structure and diversity patterns. In addition, we also found that SOC had a great influence on the community assembly processes. In conclusion, our results show that deterministic processes always dominated assembly processes in shaping bacterial community structure along the three habitat contexts.

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“…These characteristics make Mount Wutai an ideal area to study the microbial biogeography and the mechanism of bacterial community assembly. The elevational patterns of soil microbial communities have recently attracted a great deal of interest (Yao et al, 2017a; Zhang et al, 2018); however, the elevational distribution patterns and mechanisms of soil microbial subcommunities with different niche breadth traits across elevational gradients are still poorly understood. Therefore, this study was conducted to : (1) describe the diversity, structure and biogeographical patterns of soil bacterial communities and subcommunities (specialists, generalists and other taxa) across elevational gradients along the slope of Mount Wutai; (2) explore the variations and drivers related to the community assembly of soil bacterial subcommunities among elevational gradients; (3) quantify the relative roles of environmental selection and space distance in the community assembly of soil bacterial taxa and differentiate the community assembly mechanisms of bacterial subcommunities with different niche breadth across elevational gradients.…”

Section: Introductionmentioning

confidence: 99%

Biogeographic Patterns and Assembly Mechanisms of Bacterial Communities Differ Between Habitat Generalists and Specialists Across Elevational Gradients

et al. 2019

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A core issue in microbial ecology is the need to elucidate the ecological processes and underlying mechanisms involved in microbial community assembly. However, the extent to which these mechanisms differ in importance based on traits of taxa with different niche breadth is poorly understood. Here, we used high-throughput sequencing to examine the relative importance of environmental selection and stochastic processes in shaping soil bacterial sub-communities with different niche breadth (including habitat generalists, specialists and other taxa) across elevational gradients on the subalpine slope of Mount Wutai, Northern China. Our findings suggested that the composition of soil bacterial communities differed significantly different among elevational gradients. According to the niche breadth index, 10.9% of OTUs were defined as habitat generalists (B-value >8.7) and 10.0% of OTUs were defined as habitat specialists (B-value <1.5). Generalists and specialists differed distinctly in diversity and biogeographic patterns across elevational gradients. Environmental selection (deterministic processes) and spatial factors (stochastic processes) seemed to determine the assembly and biogeography of habitat generalists. However, for specialists, deterministic processes strongly influenced the distribution, while stochastic processes were not at play. Environmental drivers for generalists and specialists differed, as did their importance. Elevation, total nitrogen and pH were the main factors determining habitat generalists, and soil water content, nitrate nitrogen and pH had the strongest impacts on specialists. Moreover, variation partitioning analysis revealed that environmental selection had a much greater impact on both generalists (17.7% of pure variance was explained) and specialists (3.6%) than spatial factors. However, generalists had a much stronger response to spatial factors (2.3%) than specialists (0.3%). More importantly, null models of β-diversity suggested that specialists deviated significantly from non-neutral assembly mechanisms (relative null deviation= 0.64–0.74) relative to generalists (0.16–0.65) (P < 0.05). These results indicate that generalists and specialists are governed by different assembly mechanisms and present distinct biogeographical patterns. The large proportion of unexplained variation in specialists (93.3%) implies that very complex assembly mechanisms exist in the assembly of specialists across elevational gradients on the subalpine slope of Mount Wutai. It is essential to understand the microbial community assembly at a more refined level, and to expand the current understanding of microbial ecological mechanisms.

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Competition and habitat filtering jointly explain phylogenetic structure of soil bacterial communities across elevational gradients

Cited by 25 publications

References 64 publications

Direct and indirect effects of long‐term ditch‐buried straw return on soil bacterial community in a rice–wheat rotation system

Direct and indirect effects of long‐term ditch‐buried straw return on soil bacterial community in a rice–wheat rotation system

Deterministic processes dominate soil microbial community assembly in subalpine coniferous forests on the Loess Plateau

Biogeographic Patterns and Assembly Mechanisms of Bacterial Communities Differ Between Habitat Generalists and Specialists Across Elevational Gradients

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