Critical transition of soil bacterial diversity and composition triggered by nitrogen enrichment

Liu, Weixing; Jiang, Lin; Yang, Sen; Wang, Zhou; Tian, Rui; Peng, Ziyang; Chen, Yongliang; Zhang, Xingxu; Kuang, Jialiang; Ling, Ning; Wang, Shaopeng; Liu, Lingli

doi:10.1002/ecy.3053

Cited by 128 publications

(107 citation statements)

References 76 publications

(96 reference statements)

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“…However, β‐deviation, which accounts for variation in α‐diversity, exhibited similar trends as β‐diversity, suggesting the independence of β‐diversity responses from α‐diversity responses. Indeed, bacterial α‐ and β‐diversity were best predicted by soil pH (Liu et al, 2020) and soil environmental heterogeneity (this study), respectively, indicating that they were regulated by different mechanisms. On the other hand, our result of lower plant α‐ and β‐diversity under greater N enrichment (i.e., greater directional environmental filtering) is consistent with previous report that deterministic species extinction reduced both plant diversity components in Mediterranean grasslands (Segre et al, 2014).…”

Section: Discussionmentioning

confidence: 56%

Long‐term nitrogen input alters plant and soil bacterial, but not fungal beta diversity in a semiarid grassland

Liu

Yang

et al. 2021

Global Change Biology

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Anthropogenic nitrogen (N) input is known to alter plant and microbial α‐diversity, but how N enrichment influences β‐diversity of plant and microbial communities remains poorly understood. Using a long‐term multilevel N addition experiment in a temperate steppe, we show that plant, soil bacterial and fungal communities exhibited different responses in their β‐diversity to N input. Plant β‐diversity decreased linearly as N addition increased, as a result of increased directional environmental filtering, where soil environmental properties largely explained variation in plant β‐diversity. Soil bacterial β‐diversity first increased then decreased with increasing N input, which was best explained by corresponding changes in soil environmental heterogeneity. Soil fungal β‐diversity, however, remained largely unchanged across the N gradient, with plant β‐diversity, soil environmental properties, and heterogeneity together explaining an insignificant fraction of variation in fungal β‐diversity, reflecting the importance of stochastic community assembly. Our study demonstrates the divergent effect of N enrichment on the assembly of plant, soil bacterial and fungal communities, emphasizing the need to examine closely associated fundamental components (i.e., plants and microorganisms) of ecosystems to gain a more complete understanding of ecological consequences of anthropogenic N enrichment.

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Section: Discussionmentioning

confidence: 56%

Long‐term nitrogen input alters plant and soil bacterial, but not fungal beta diversity in a semiarid grassland

Liu

Yang

et al. 2021

Global Change Biology

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“…Moreover, N addition reduces the abundance of oligotrophic microbes, which are adept at catabolizing more recalcitrant C compounds, as they may be outcompeted by copiotrophic taxa with higher N demands (Ramirez et al 2012). The observed decrease in the fungal to bacterial ratio across a wide range of ecosystems (Zhang et al 2018) confirmed these hypotheses and suggested that a shift in the microbial community composition towards the bacterial decomposition of soil organic C is another crucial mechanism explaining the increased soil C storage under N addition (Freedman et al 2016;Wang et al 2018;Liu et al 2020).…”

Section: Introductionmentioning

confidence: 74%

Increased microbial sequestration of soil organic carbon under nitrogen deposition over China’s terrestrial ecosystems

et al. 2020

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Background China’s terrestrial ecosystems have been receiving increasing amounts of reactive nitrogen (N) over recent decades. External N inputs profoundly change microbially mediated soil carbon (C) dynamics, but how elevated N affects the soil organic C that is derived from microbial residues is not fully understood. Here, we evaluated the changes in soil microbial necromass C under N addition at 11 forest, grassland, and cropland sites over China’s terrestrial ecosystems through a meta-analysis based on available data from published articles. Results Microbial necromass C accounted for an average of 49.5% of the total soil organic C across the studied sites, with higher values observed in croplands (53.0%) and lower values in forests (38.6%). Microbial necromass C was significantly increased by 9.5% after N addition, regardless of N forms, with greater stimulation observed for fungal (+ 11.2%) than bacterial (+ 4.5%) necromass C. This increase in microbial necromass C under elevated N was greater under longer experimental periods but showed little variation among different N application rates. The stimulation of soil microbial necromass C under elevated N was proportional to the change in soil organic C. Conclusions The stimulation of microbial residues after biomass turnover is an important pathway for the observed increase in soil organic C under N deposition across China’s terrestrial ecosystems.

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“…The above analysis resulted in a total of 424,628 (ranging from 31,030 to 40,328 sequences per sample) and 775,842 (ranging from 36,438 to 40,328 sequences per sample) high-quality sequences of pmoA and mcrA in all samples, respectively (Table S3). To standardize the results, we resampled each sample using the sequence number of the sample with the least sequences and calculated the diversity indices based on this normalized data set 101,102 . The remaining high-quality sequences were clustered into OTUs at a 97% identity threshold using UCLUST.…”

Section: High-throughput Sequencing and Bioinformatics Pcr Amplificamentioning

confidence: 99%

Nitrogen addition decreases methane uptake caused by methanotroph and methanogen imbalances in a Moso bamboo forest

Peng

Zhang

et al. 2021

Sci Rep

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Forest soils play an important role in controlling global warming by reducing atmospheric methane (CH4) concentrations. However, little attention has been paid to how nitrogen (N) deposition may alter microorganism communities that are related to the CH4 cycle or CH4 oxidation in subtropical forest soils. We investigated the effects of N addition (0, 30, 60, or 90 kg N ha−1 yr−1) on soil CH4 flux and methanotroph and methanogen abundance, diversity, and community structure in a Moso bamboo (Phyllostachys edulis) forest in subtropical China. N addition significantly increased methanogen abundance but reduced both methanotroph and methanogen diversity. Methanotroph and methanogen community structures under the N deposition treatments were significantly different from those of the control. In N deposition treatments, the relative abundance of Methanoculleus was significantly lower than that in the control. Soil pH was the key factor regulating the changes in methanotroph and methanogen diversity and community structure. The CH4 emission rate increased with N addition and was negatively correlated with both methanotroph and methanogen diversity but positively correlated with methanogen abundance. Overall, our results suggested that N deposition can suppress CH4 uptake by altering methanotroph and methanogen abundance, diversity, and community structure in subtropical Moso bamboo forest soils.

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Critical transition of soil bacterial diversity and composition triggered by nitrogen enrichment

Cited by 128 publications

References 76 publications

Long‐term nitrogen input alters plant and soil bacterial, but not fungal beta diversity in a semiarid grassland

Long‐term nitrogen input alters plant and soil bacterial, but not fungal beta diversity in a semiarid grassland

Increased microbial sequestration of soil organic carbon under nitrogen deposition over China’s terrestrial ecosystems

Nitrogen addition decreases methane uptake caused by methanotroph and methanogen imbalances in a Moso bamboo forest

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