Soil microbial diversity–biomass relationships are driven by soil carbon content across global biomes

The ISME Journal, Journal Year: 2021, Volume and Issue: 15(7), P. 2081 - 2091

Published: Feb. 9, 2021

Abstract The relationship between biodiversity and biomass has been a long standing debate in ecology. Soil are essential drivers of ecosystem functions. However, unlike plant communities, little is known about how the diversity soil microbial communities interlinked across globally distributed biomes, variations this influence function. To fill knowledge gap, we conducted field survey global with contrasting vegetation climate types. We show that carbon (C) content associated to diversity–biomass ratio soils biomes. This provides an integrative index identify those locations on Earth wherein much higher compared vice versa. diversity-to-biomass peaks arid environments low C content, very C-rich cold environments. Our study further advances reductions land use intensification change could cause dramatic shifts diversity-biomass ratio, potential consequences for broad processes.

Language: Английский

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Regulation of priming effect by soil organic matter stability over a broad geographic scale

Nature Communications, Journal Year: 2019, Volume and Issue: 10(1)

Published: Nov. 8, 2019

The modification of soil organic matter (SOM) decomposition by plant carbon (C) input (priming effect) represents a critical biogeochemical process that controls C dynamics. However, the patterns and drivers priming effect remain hidden, especially over broad geographic scales under various climate conditions. By combining systematic field laboratory analyses based on multiple analytical statistical approaches, we explore determinants intensity along 2200 km grassland transect Tibetan Plateau. Our results show SOM stability characterized chemical recalcitrance physico-chemical protection explains more variance in than plant, microbial properties. High (up to 137% basal respiration) is associated with complex structures low mineral-organic associations. dependence stabilization mechanisms should be considered Earth System Models accurately predict dynamics changing environments.

Language: Английский

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Soil carbon sequestration by root exudates

Trends in Plant Science, Journal Year: 2022, Volume and Issue: 27(8), P. 749 - 757

Published: May 20, 2022

Language: Английский

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Global patterns and associated drivers of priming effect in response to nutrient addition

Soil Biology and Biochemistry, Journal Year: 2020, Volume and Issue: 153, P. 108118 - 108118

Published: Dec. 22, 2020

Language: Английский

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Advancing the mechanistic understanding of the priming effect on soil organic matter mineralisation

Functional Ecology, Journal Year: 2022, Volume and Issue: 36(6), P. 1355 - 1377

Published: March 9, 2022

Abstract The priming effect (PE) is a key mechanism contributing to the carbon balance of soil ecosystem. Almost 100 years research since its discovery in 1926 have led rich body scientific publications identify drivers and mechanisms involved. A few review articles summarised acquired knowledge; last major one was published 2010. Since then, knowledge on microbial communities involved PE + C sequestration has been considerably renewed. This article reviews current state what extent new insights may improve our ability understand predict evolution stocks. We propose framework unify different concepts terms that emerged from international community this topic, report recent discoveries needs. Seventy per cent studies were 10 years, illustrating renewed interest for PE, probably linked increased concern about importance climate change food security issues. Among all proposed along with explain some are named differently but actually refer same object. overall introduces ‘artificial’ complexity mechanistic understanding we common, shared terminology. Despite remaining gaps, consistent progress achieved decipher abiotic underlying together role enzymes identity actors However, including into models SOM dynamics remains challenging as long not fully understood. In meantime, empirical alternatives available reproduce observations accurately when calibration robust. Based knowledge, scenarios depicting impact ecosystem services under conditions. Read free Plain Language Summary Journal blog.

Language: Английский

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Deciphering the Fingerprint of Dissolved Organic Matter in the Soil Amended with Biodegradable and Conventional Microplastics Based on Optical and Molecular Signatures

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(22), P. 15746 - 15759

Published: Oct. 27, 2022

Biodegradable polymers are promoted as promising alternatives for conventional non-degradable plastics, but they may also negatively impact soil ecosystems. Here, we estimated the effects of biodegradable (polylactide (PLA) and polybutylene succinate (PBS)) non-biodegradable (polyethylene (PE) polystyrene (PS)) microplastics at a concentration 1% (w/w) on dissolved organic matter (DOM) in two types, black (BS) yellow (YS), by using fluorescence excitation-emission matrix spectroscopy ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). PBS significantly increased contents carbon (DOC) relative intensities protein-like components. The turnover rates DOM were statistically higher treatments (0.106 0.196, p < 0.001) than those other microplastic groups. FT-ICR-MS results indicated that more labile-active molecules preferentially obtained treatments, which be attributed to polymer degradation. showed no significant optical characteristics changed molecular compositions DOM. More labile observed BS samples treated with PE compared control, while decreased lability YS soil. distinct priming plastic-leached trigger changes different soils. This study provided important information further understanding processes.

Language: Английский

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Soil priming effect and its responses to nutrient addition along a tropical forest elevation gradient

Global Change Biology, Journal Year: 2021, Volume and Issue: 27(12), P. 2793 - 2806

Published: March 8, 2021

Abstract Priming plays important roles in terrestrial carbon cycling, but the patterns and drivers of priming its responses to nutrient addition tropical forests remain unclear. By collecting soils along a forest elevation gradient, we conducted an incubation experiment with 13 C‐labeled glucose (N and/or P) additions. Results showed that effects increased soil organic matter decomposition by 44 ± 12% across elevations, intensity decreased significantly elevation. Among microbial properties, (SOC) content pH were two key factors negatively positively regulating priming, respectively. Across additions N, P, or both them (NP) did not change priming. However, variations on correlated initial availability. The for N availability, P NP Based these relationships, proposed conceptual framework linking stoichiometric mining hypotheses, which former dominates low‐nutrient availability latter high‐nutrient soils. This can help explain contrasting Collectively, our findings highlight SOC intensity, role

Language: Английский

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Priming effect on soil carbon decomposition by root exudate surrogates: A meta-analysis

Soil Biology and Biochemistry, Journal Year: 2023, Volume and Issue: 178, P. 108955 - 108955

Published: Jan. 10, 2023

Language: Английский

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Drivers of microbially and plant‐derived carbon in topsoil and subsoil

Global Change Biology, Journal Year: 2023, Volume and Issue: 29(22), P. 6188 - 6200

Published: Sept. 21, 2023

Abstract Plant‐ and microbially derived carbon (C) are the two major sources of soil organic matter (SOM), their ratio impacts SOM composition, accumulation, stability, turnover. The contributions key factors defining plant microbial C in along profile not well known. By leveraging nuclear magnetic resonance spectroscopy biomarker analysis, we analyzed three types using regional‐scale sampling combined these results with a meta‐analysis. Topsoil (0–40 cm) was rich carbohydrates lignin (38%–50%), whereas subsoil (40–100 contained more proteins lipids (26%–60%). proportion increases, while decreases content. decrease rate to plant‐derived (C M:P ) content 23%–30% faster topsoil than regional study had high potential stabilize through intensive transformations necromass formation. Plant input mean annual temperature were main topsoil, fungi‐to‐bacteria clay influencing . Combining meta‐analysis, highlighted contribution litter up 1‐m depth elucidated regulating long‐term preservation.

Language: Английский

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Moisture-driven divergence in mineral-associated soil carbon persistence

Proceedings of the National Academy of Sciences, Journal Year: 2023, Volume and Issue: 120(7)

Published: Feb. 6, 2023

Mineral stabilization of soil organic matter is an important regulator the global carbon (C) cycle. However, vulnerability mineral-stabilized (OM) to climate change currently unknown. We examined profiles from 34 sites across conterminous USA investigate how abundance and persistence mineral-associated C varied with at continental scale. Using a novel combination radiocarbon molecular composition measurements, we show that relationship between (MAOM) appears be driven by moisture availability. In wetter climates where precipitation exceeds evapotranspiration, excess leads deeper more prolonged periods wetness, creating conditions which favor greater root also allow for diffusion interaction inputs MAOM. these humid soils, concentration are strongly linked, whereas this absent in drier climates. arid lower, mineral surfaces limited shallower briefer moisture, resulting disconnect persistence. Data suggest tipping point cycling threshold equals evaporation. As patterns shift, our findings emphasize divergence mechanisms OM associated historical legacies need considered process-based models.

Language: Английский

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