Arbuscular mycorrhiza convey significant plant carbon to a diverse hyphosphere microbial food web and mineral‐associated organic matter

New Phytologist, Journal Year: 2024, Volume and Issue: 242(4), P. 1661 - 1675

Published: Feb. 15, 2024

Arbuscular mycorrhizal fungi (AMF) transport substantial plant carbon (C) that serves as a substrate for soil organisms, precursor of organic matter (SOM), and driver microbial dynamics. Using two-chamber microcosms where an air gap isolated AMF from roots, we

Language: Английский

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Microbial life‐history strategies mediate microbial carbon pump efficacy in response to N management depending on stoichiometry of microbial demand

Global Change Biology, Journal Year: 2024, Volume and Issue: 30(5)

Published: May 1, 2024

The soil microbial carbon pump (MCP) is increasingly acknowledged as being directly linked to organic (SOC) accumulation and stability. Given the close coupling of (C) nitrogen (N) cycles constraints imposed by their stoichiometry on growth, N addition might affect growth strategies with potential consequences for necromass formation However, this topic remains largely unexplored. Based two multi-level fertilizer experiments over 10 years in soils contrasting fertility located North (Cambisol, carbon-poor) Southwest (Luvisol, carbon-rich), we hypothesized that different resource demands microorganism elicit a trade-off (Y-strategy) resource-acquisition (A-strategy) response addition, consequently We combined measurements metrics (MCP efficacy) stability (chemical composition mineral associated carbon) changes life history (assessed via metagenomes enzymatic activity analyses). contribution SOC decreased Cambisol, but increased Luvisol. Soil displayed distinct responses after amendment: shift toward A-strategy (Cambisol) or Y-strategy (Luvisol). These divergent are owing stoichiometric imbalance between availability C N, which presented very patterns soils. partial correlation analysis further confirmed high aggravated demand, shifting community strategy reduced Cambisol. In contrast, had positive direct effect MCP efficacy Luvisol, greatly enhanced Such findings provide mechanistic insights into regulation efficacy, how mediated site-specific trade-offs strategies, contribute improving our comprehension sequestration optimization agricultural management.

Language: Английский

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Substituting readily available nitrogen fertilizer with controlled-release nitrogen fertilizer improves crop yield and nitrogen uptake while mitigating environmental risks: A global meta-analysis

Field Crops Research, Journal Year: 2023, Volume and Issue: 306, P. 109221 - 109221

Published: Dec. 15, 2023

Language: Английский

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Effect of organic material addition on active soil organic carbon and microbial diversity: A meta-analysis

Soil and Tillage Research, Journal Year: 2024, Volume and Issue: 241, P. 106128 - 106128

Published: April 24, 2024

Language: Английский

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Pathways of soil organic carbon accumulation are related to microbial life history strategies in fertilized agroecosystems

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 927, P. 172191 - 172191

Published: April 6, 2024

Language: Английский

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Land use intensity is a major driver of soil microbial and carbon cycling across an agricultural landscape

Soil Biology and Biochemistry, Journal Year: 2024, Volume and Issue: 196, P. 109508 - 109508

Published: June 26, 2024

Soil carbon (C) storage is a critical ecosystem function that underpins human health and well-being. The acceleration of human-driven land use change, such as agricultural intensification, major driver soil C loss globally. Developing sustainable practices enhance productivity whilst protecting essential functions vital. microbiome has role in regulating biogeochemical cycling processes, including cycling. Examining the impacts intensity on enables us to assess potential effects long-term stocks. Using metagenomic DNA sequencing phospholipid fatty acid analysis, we investigated differences activity, diversity, associated with five contrasting uses across an landscape. covered gradient disturbance intensities included remnant native forest, regenerating bush, exotic plantation dryland pasture, irrigated pasture. We identified pronounced each use, diversity abundance microbial nitrogen (N) genes. Notably, intensive had significantly higher C-degrading genes, forest lowest Our findings suggest may increase functional mineralize C, potentially resulting greater respired CO2 into atmosphere. This research be used support development management promote persistence landscapes, protection fragments incorporation vegetation.

Language: Английский

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A new approach to continuous monitoring of carbon use efficiency and biosynthesis in soil microbes from measurement of CO₂ and O₂

Biogeosciences, Journal Year: 2025, Volume and Issue: 22(1), P. 87 - 101

Published: Jan. 9, 2025

Abstract. Soils comprise the largest terrestrial carbon pool. Therefore, understanding processes that control soil stabilization and release is vital to improving our of global cycle. Heterotrophic respiration main pathway by which organic returned atmosphere; however, not all utilized heterotrophs shares this fate, as some portion retained in biomass biosynthesized extracellular compounds. The fraction consumed microbes used for growth (the use efficiency or CUE) an important variable controlling stocks but difficult measure. Here we show CUE can be continuously monitored laboratory glucose-amended incubations measuring CO2 O2 gas concentrations, allowing instantaneous estimates microbial growth. We derive a theoretical relationship between respiratory quotient (RQ), ratio dioxide produced oxygen during respiration, recognizes influence both substrate product oxidation states on RQ. Assuming has stoichiometry average microbe primarily glucose amendment, measure RQ calculate from production. Extractions at end experiments reveal minimal net increases standing across amended treatments, suggesting much newly likely converted necromass availability declines, results storage new matter. Carbon budgets compiled measurements relevant pools account suggest with larger amendments, C:N ratios lead relative amendment acutely lost soil. These findings demonstrate values may monitor changes studies should consider key factor when are observed, instance, changing environmental conditions production plant-derived This approach leveraged provide information how understand transformations, specifically fate fresh inputs.

Language: Английский

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Microbial regulation of feedbacks to ecosystem change

Trends in Microbiology, Journal Year: 2023, Volume and Issue: 32(1), P. 68 - 78

Published: July 25, 2023

Microbes are key biodiversity components of all ecosystems and control vital ecosystem functions. Although we have just begun to unravel the scales factors that regulate microbial communities, their role in mediating stability response disturbances remains underexplored. Here, review evidence how, when, where microbes or drive disturbance feedbacks. Negative feedbacks dampen impacts disturbance, which maintain stability, whereas positive instead erode by amplifying disturbance. Here describe processes underlying responses using a hierarchy functional traits, exemplify how these may biogeochemical We suggest feedback potential traits at different hierarchical levels is contingent on complexity heterogeneity environment. Microbial functioning intrinsically linked resistance resilience ecosystems. impact stability. Functional from delineated genotypes community-wide mediate intensity direction Feedbacks can be (amplifying) negative (dampening) emerge altered cycling related responses. Generalizable frameworks for adapt time space needed increase understanding predictability temporal

Language: Английский

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Nitrogen addition alters the relative importance of roots and mycorrhizal hyphae in regulating soil organic carbon accumulation in a karst forest

Soil Biology and Biochemistry, Journal Year: 2024, Volume and Issue: 195, P. 109471 - 109471

Published: May 8, 2024

Language: Английский

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Fungal necromass is reduced by intensive drought in subsoil but not in topsoil

Global Change Biology, Journal Year: 2023, Volume and Issue: 29(24), P. 7159 - 7172

Published: Oct. 13, 2023

The frequency and intensity of droughts worldwide are challenging the conservation soil organic carbon (SOC) pool. Microbial necromass is a key component SOC, but how it responds to drought at specific depths remains largely unknown. Here, we conducted 3-year field experiment in forest plantation investigate impacts intensities under three treatments (ambient control [CK], moderate [30% throughfall removal], intensive [50% removal]) on microbial pools (i.e., bacterial carbon, fungal total carbon). We showed that effects depended groups, depth, intensity. While increased (+9.1% ± 3.3%) (+13.5% 4.9%) topsoil layer (0-15 cm), reduced (-31.6% 3.7%) (-43.6% 4.0%) subsoil (15-30 cm). In contrast, both significantly BNC subsoil. Our results suggested were more pronounced than those topsoil. This study highlights complex responses events depending community structure, depth with global implications when forecasting cycling climate change.

Language: Английский

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