Organic amendments drive shifts in microbial community structure and keystone taxa which increase C mineralization across aggregate size classes

Wang, Xiaoyue; Bian, Qing; Jiang, Yuji; Zhu, Lingyue; Chen, Yan; Liang, Yuting; Sun, Bo

doi:10.1016/j.soilbio.2020.108062

Cited by 124 publications

(69 citation statements)

References 60 publications

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“…Notably, the SOC content was increased with the increase of soil aggregate size (Fig. 1B), which was in stark contrast with previous findings that organic amendments increased the SOC concentration the most in the microaggregates, based on the dry-sieving approach (Wang et al, 2021). This discrepancy might arise from the fact that wet sieving could lead to a loss of total C or total N, especially for soil fractions < 250 μm in comparison to dry sieving (Sainju, 2006).…”

Section: Effects Of Fertilizations On Soil Aggregation and Soc Stockcontrasting

confidence: 91%

“…Previously, Liao et al (2018) proposed that bacterial communities were driven by chemical fertilization, as they were closely dependent on the shifts of soil phosphorus. More studies have reported that organic treatments greatly alter the microbial community structure mainly by changing the SOC content (Ding and Han, 2014;Wang et al, 2021).…”

Section: Effects Of Fertilizations On Soil Aggregation and Soc Stockmentioning

confidence: 99%

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Microscale heterogeneity of soil bacterial communities under long-term fertilizations in fluvo-aquic soils

Feng

Pan

et al. 2022

Soil Ecol. Lett.

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Differently sized soil aggregates, with non-uniform distribution of space and nutrients, provide spatially heterogeneous microenvironments for microorganisms and are important for controlling microbial community ecology and biogeochemistry in soils. Here, we investigated the prokaryotic communities within different aggregate-size fractions: macroaggregate ( > 0.25 mm), microaggregate (0.053-0.25 mm) and silt + clay ( < 0.053 mm). These were isolated from fluvo-aquic soils under 39-year fertilization strategies: no fertilizer (CK), chemical fertilizer (NPK), manure fertilizer (M), and combination of manure and chemical fertilizers (MNPK). The results showed that the proportion of macroaggregate, soil aggregate-associated organic carbon (SOC) content and aggregate stability were all significantly increased by both manure and chemical fertilizations. Organic fertilizations (M and MNPK) more effectively boosted formation and stability of macroaggregates and enhanced SOC concentration than NPK. The distribution patterns of microorganisms in aggregates were primarily shaped by fertilization and aggregate size. They explained 76.9% of the variance in bacterial community compositions. Fertilizations, especially with organic fertilizers primarily transitioned bacterial communities from slow-growing oligotrophic groups (e.g., Chloroflexi) dominance to fast-growing copiotrophic groups (e.g., Proteobacteria and Bacteroidetes) dominance across all aggregate sizes. Macroaggregates possessed a more stable bacterial community and efficiency of resource transfer, while smaller aggregates increased antagonism and weakened mutualism among bacterial communities. Overall, combination of manure and chemical fertilizers was crucial for increasing SOC content and aggregation, leading to a clear shift in bacterial community structures at aggregate scale.

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Section: Effects Of Fertilizations On Soil Aggregation and Soc Stockcontrasting

confidence: 91%

Section: Effects Of Fertilizations On Soil Aggregation and Soc Stockmentioning

confidence: 99%

Microscale heterogeneity of soil bacterial communities under long-term fertilizations in fluvo-aquic soils

Feng

Pan

et al. 2022

Soil Ecol. Lett.

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“…Compared across all treatments, the application of organic manure drastically improved MBC (the increase in MBC in OM was 207% more over the CK plots) followed by chemical fertilizer (the increase in MBC in FR was 82% more over the CK plots; Figure 1b). This is likely because labile carbon, such as organic manure, is rapidly transformed into microbialderived carbon, which more easily promotes microbial growth (Wang et al, 2021). Other possible reasons for the increased MBC might be that fertilizer application increased the organic residue (such as crop root biomass and wheat/rice stubble) in soil, and the increased plant residue carbon is accessible for microbial degradation and microbial reproduction.…”

Section: Soc and Its Fractionsmentioning

confidence: 99%

Soil organic carbon fractions and its association with water‐stable aggregates under different fertilization management practices

Zhao

Gao

et al. 2021

Soil Use and Management

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Agricultural soil organic carbon (SOC) plays a critical role in soil ecosystems, and SOC sequestration is a key ecosystem service. This study investigated the SOC fractions, including mineral-incorporated organic carbon (MSC), intraparticulate organic carbon (iPOC) and microbial biomass carbon (MBC), in bulk soil and water-stable aggregates, as influenced by soil fertilization managements, using three treatments: no fertilizer (CK), chemical fertilizer (FR) and organic manure (OM). Fertilizer application significantly increased SOC content and its fractions (MSC, iPOC and MBC) compared to CK, and the effect of organic manure amendment had more impact on the SOC accumulation than chemical fertilizer. Macroaggregate (>250 μm)associated SOC, MSC and iPOC (including fine and coarse iPOC) increased by 22%-283%, 18%-84% and 45%-232%, respectively, in FR and OM treatments compared with CK. In addition, the iPOC:MSC ratio values (%) within all size aggregates were all increased in the FR (about 84%-183%) and OM (about 103%-230%) treatments compared to CK (about 65%-146%).Meanwhile, MBC:SOC ratio values were the highest (about 2.16%-3.07%) in small macroaggregates (250-2000 μm), but decreased sharply (about 2%-2.35%) in large macroaggregates (>2000 μm) in different treatments. Our findings suggested that macroaggregates were the main sites of carbon sequestration and that carbon became more unstable with the increase of SOC in aggregates. Furthermore, the microbial biomass showed obvious differentiation characteristics in macroaggregates (>250 μm). Specifically, small macroaggregates (250-2000 μm) contained more microbial biomass, and large macroaggregates (>2000 μm) were inclined to inhibit microbial activity.

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“…According to the LEfSe results, Eurotiales were enriched in CTS treatment. A recent study has demonstrated that organic matter can promote the growth of fungal taxa, and Eurotiales is important for the SOC decomposition process ( Wang et al, 2021 ). One of the other fungi found to be enriched in the plots subject to NTS treatment was Agaricomycetes , which can degrade various substrates, such as cellulose and lignin ( Zhang et al, 2021 ).…”

Section: Discussionmentioning

confidence: 99%

Response of Fungal Sub-Communities in a Maize-Wheat Rotation Field Subjected to Long-Term Conservation Tillage Management

et al. 2022

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Conservation tillage is an advanced agricultural technology that seeks to minimize soil disturbance by reducing, or even eliminating tillage. Straw or stubble mulching in conservation tillage systems help to increase crop yield, maintain biodiversity and increase levels of exogenous nutrients, all of which may influence the structure of fungal communities in the soil. Currently, however, the assembly processes and co-occurrence patterns of fungal sub-communities remain unknown. In this paper, we investigated the effects of no-tillage and straw mulching on the composition, assembly process, and co-occurrence patterns of soil fungal sub-communities in a long-term experimental plot (15 years). The results revealed that combine straw mulching with no-tillage significantly increased the richness of fungi but not their diversity. Differential abundance analysis and principal component analysis (PCA) indicated that tillage management had a greater effect on the fungal communities of abundant and intermediate taxa than on the rare taxa. Available phosphorus (AP) and total nitrogen (TN) were the major determinants of fungal sub-communities in NT treatment. The abundant fungal sub-communities were assembled by deterministic processes under medium strength selection, while strong conservation tillage strength shifts the abundant sub-community assembly process from deterministic to stochastic. Overall, the investigation of the ecological network indicated that no-tillage and straw mulching practices decreased the complexity of the abundant and intermediate fungal networks, while not significantly influencing rare fungal networks. These findings refine our knowledge of the response of fungal sub-communities to conservation tillage management techniques and provide new insights into understanding fungal sub-community assembly.

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Organic amendments drive shifts in microbial community structure and keystone taxa which increase C mineralization across aggregate size classes

Cited by 124 publications

References 60 publications

Microscale heterogeneity of soil bacterial communities under long-term fertilizations in fluvo-aquic soils

Microscale heterogeneity of soil bacterial communities under long-term fertilizations in fluvo-aquic soils

Soil organic carbon fractions and its association with water‐stable aggregates under different fertilization management practices

Response of Fungal Sub-Communities in a Maize-Wheat Rotation Field Subjected to Long-Term Conservation Tillage Management

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