Nitrogen fertilization weakens the linkage between soil carbon and microbial diversity: A global meta‐analysis

Global Change Biology, Journal Year: 2022, Volume and Issue: 28(21), P. 6446 - 6461

Published: July 29, 2022

Abstract Soil microbes make up a significant portion of the genetic diversity and play critical role in belowground carbon (C) cycling terrestrial ecosystems. microbial organic C are often tightly coupled processes; however, this coupling can be weakened or broken by rapid global change. A meta‐analysis was performed with 1148 paired comparisons extracted from 229 articles published between January 1998 December 2021 to determine how nitrogen (N) fertilization affects relationship soil content We found that N decreased bacterial (−11%) fungal (−17%), but increased (SOC) (+19%), biomass (MBC) (+17%), dissolved (DOC) (+25%) across different Organic (urea) had greater effect on SOC, MBC, DOC, than inorganic fertilization. Most importantly, increasing absolute values correlation coefficients rate duration, suggesting linkage diversity. The might negatively impact essential ecosystem services under high rates fertilization; understanding is important for mitigating negative enrichment cycling.

Language: Английский

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Nitrogen fertilizer builds soil organic carbon under straw return mainly via microbial necromass formation

Soil Biology and Biochemistry, Journal Year: 2023, Volume and Issue: 188, P. 109223 - 109223

Published: Oct. 22, 2023

Language: Английский

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Integrating microbial community properties, biomass and necromass to predict cropland soil organic carbon

ISME Communications, Journal Year: 2023, Volume and Issue: 3(1)

Published: Aug. 23, 2023

Manipulating microorganisms to increase soil organic carbon (SOC) in croplands remains a challenge. Soil microbes are important drivers of SOC sequestration, especially via their necromass accumulation. However, microbial parameters rarely used predict cropland stocks, possibly due uncertainties regarding the relationships between pools, community properties and SOC. Herein we evaluated (diversity network complexity), pools (biomass carbon) 468 soils across northeast China. We found that not only but also complexity) biomass were correlated with Microbial diversity played more role predicting for maize, while complexity was rice. Models performed better when included simultaneously. Taken together our results suggest influence accumulation croplands, management practices improve these may levels.

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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Ecosystem‐dependent responses of soil carbon storage to phosphorus enrichment

New Phytologist, Journal Year: 2023, Volume and Issue: 238(6), P. 2363 - 2374

Published: March 24, 2023

Phosphorus deposition can stimulate both plant carbon inputs and microbial outputs. However, how P enrichment affects soil organic (SOC) storage the underlying mechanisms remain unclear. We conducted a meta-analysis of 642 SOC observations from 213 field addition experiments world-wide explored regulations inputs, outputs, characteristics, environmental experimental factors on responses. found that, globally, stimulated by 4.0% (95% CI: 2.0-6.0%), but stimulation only occurred in forest cropland rather than grassland. Across sites, response correlated with that aboveground belowground biomass, suggesting change was more important regulating changes due to addition. Among multiple factors, N fixation status mean annual temperature were best predictors for responses addition, being higher ecosystems dominated symbiotic nitrogen fixers high-temperature regions like tropical forests. Our findings highlight differential ecosystem-dependent contribute accurate predictions dynamics P-enriched world.

Language: Английский

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Climate warming alters the relative importance of plant root and microbial community in regulating the accumulation of soil microbial necromass carbon in a Tibetan alpine meadow

Global Change Biology, Journal Year: 2023, Volume and Issue: 29(11), P. 3193 - 3204

Published: March 2, 2023

Climate warming is predicted to considerably affect variations in soil organic carbon (SOC), especially alpine ecosystems. Microbial necromass (MNC) an important contributor stable pools. However, accumulation and persistence of MNC across a gradient are still poorly understood. An 8-year field experiment with four levels was conducted Tibetan meadow. We found that low-level (+0-1.5°C) mostly enhanced bacterial (BNC), fungal (FNC), total compared control treatment layers, while no significant effect caused between high-level (+1.5-2.5°C) treatments treatments. The contributions both BNC were not significantly affected by depths. Structural equation modeling analysis demonstrated the plant root traits on strengthened intensity, influence microbial community characteristics waned along warming. Overall, our study provides novel evidence major determinants production stabilization may vary magnitude meadows. This finding critical for updating knowledge storage response climate

Language: Английский

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Phosphorus supply suppressed microbial necromass but stimulated plant lignin phenols accumulation in soils of alpine grassland on the Tibetan Plateau

Geoderma, Journal Year: 2023, Volume and Issue: 431, P. 116376 - 116376

Published: Feb. 8, 2023

Increased nitrogen (N) and phosphorus (P) inputs have fundamental effects on the soil organic carbon (SOC) composition dynamics. However, responses of plant- microbial-derived SOC components to N P addition in alpine grasslands are poorly understood. Based a 10-year experiment conducted grassland Tibetan Plateau, we used amino sugars lignin phenols as tracers for microbial necromass plant components, respectively, explored their accumulation with P. We found that + (P supply) decreased necromass, whereas did not significant effect. In comparison, supply increased topsoil, but them subsoil. Among these factors, total played non-negligible role controlling soils. addition, ratios fungi-to-bacteria were observed supply. This implies although change significantly, it may eventually loss potential. Collectively, attempted elucidate underlying mechanisms long-term sequestration, which has important implications microbial-mediated processes context increasing inputs.

Language: Английский

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Vegetation restoration altered the soil organic carbon composition and favoured its stability in a Robinia pseudoacacia plantation

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 899, P. 165665 - 165665

Published: July 19, 2023

Language: Английский

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Divergent accumulation of amino sugars and lignins mediated by soil functional carbon pools under tropical forest conversion

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 881, P. 163204 - 163204

Published: April 10, 2023

Language: Английский

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Recalcitrant organic carbon plays a key role in soil carbon sequestration along a long-term vegetation succession on the Loess Plateau

CATENA, Journal Year: 2023, Volume and Issue: 233, P. 107528 - 107528

Published: Sept. 18, 2023

Language: Английский

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