Depth‐dependent responses of soil organic carbon under nitrogen deposition

Global Change Biology, Journal Year: 2024, Volume and Issue: 30(3)

Published: March 1, 2024

Abstract Emerging evidence points out that the responses of soil organic carbon (SOC) to nitrogen (N) addition differ along profile, highlighting importance synthesizing results from different layers. Here, using a global meta‐analysis, we found N significantly enhanced topsoil (0–30 cm) SOC by 3.7% (±1.4%) in forests and grasslands. In contrast, subsoil (30–100 initially increased with but decreased over time. The model selection analysis revealed experimental duration vegetation type are among most important predictors across wide range climatic, environmental, edaphic variables. contrasting indicate considering deep layers, particularly for long‐term continuous deposition. Finally, lack depth‐dependent modeling frameworks has likely resulted overestimation changes storage under

Language: Английский

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Macrofungi promote SOC decomposition and weaken sequestration by modulating soil microbial function in temperate steppe

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 899, P. 165556 - 165556

Published: July 15, 2023

Language: Английский

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Soil organic carbon fractions in China: Spatial distribution, drivers, and future changes

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 919, P. 170890 - 170890

Published: Feb. 10, 2024

Language: Английский

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Nitrogen Addition Promotes the Accumulation of Soil Particulate Organic Carbon in a Subtropical Forest

Forests, Journal Year: 2024, Volume and Issue: 15(4), P. 619 - 619

Published: March 28, 2024

Nitrogen (N) deposition rates of terrestrial ecosystems have gradually declined but are still high in some areas. Previous studies reported that N addition elicits diverse impacts on soil organic carbon (SOC) pools. SOC can be divided into different functional fractions, namely, particulate (POC) and mineral-associated (MAOC). The responses these fractions to should elucidated better understand the changes Here, we conducted a experiment (0, 40, 80 kg ha−1 yr−1) subtropical Castanopsis fabri forest simulate deposition. surface (0−10 cm) aboveground litter product, fine root (diameter < 2 mm) biomass, exchangeable cation content, enzyme activity under treatments were measured. results showed following: (1) positive effect POC contents did not significantly affect MAOC content; (2) content was negatively correlated with pH positively suggesting accumulation influenced by input microbial decomposition; (3) close negative relationship observed between Al3+ Ca2+ or K+ contents, indicating there is likely trade-off mineral sorption desorption, thus resulting an insignificant reaction addition. Overall, short-term found primarily driven POC, response inconsistent. By incorporating nuances ecosystem models, it possible predict dynamics more accurately global change.

Language: Английский

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The response of soil labile organic carbon in cold temperate forest to snowpack removal is both sensitive and resilient

CATENA, Journal Year: 2025, Volume and Issue: 249, P. 108715 - 108715

Published: Jan. 13, 2025

Language: Английский

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Unveiling carbon dynamics in year-round waterlogged pond fields: insights into soil organic carbon accumulation and sustainable management

Carbon Research, Journal Year: 2025, Volume and Issue: 4(1)

Published: Jan. 28, 2025

Abstract Agri-ecosystems with flooded fields are pivotal in global carbon (C) dynamics. Although extensive research has focused on sequestration paddy fields, year-round waterlogged pond remain underexplored. This study investigates dynamics planted Semen Euryales for 0, 24, and 60 years, examining soil organic (SOC) accumulation shifts its composition. The results revealed a progressive increase SOC, driven by particulate C (POC) mineral-associated (MAOC). SOC increased significantly from 7.49 g kg –1 to 46.10 over the rising 12.0% 42.0% (MAOC) decreasing 87.8% 58.0%. Lignin phenols, reflecting plant-derived carbon, surged 11.0% 68.8%, while amino sugars, indicative of microbial residues, declined 89.0% 31.2%, suggesting reduced activity under prolonged anaerobic conditions. Total phospholipid fatty acid (PLFA) decreased 40.6% 43.8% after 24 respectively, further supporting conclusion that conditions limit survival. waterlogging decomposition, enhancing POC, particularly such as residues. especially fungal necromass, played significant role forming MAOC. That is, continuous promoted POC also contributed MAOC stabilization. findings provide valuable insights into sustainable management practices contribute climate change mitigation. Graphical

Language: Английский

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Arbuscular mycorrhizal fungal genotype and nuclear organization as driving factors in host plant nutrient acquisition and stable carbon storage

Plants People Planet, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 9, 2025

Societal Impact Statement It is crucial to develop strategies for reducing our continued excessive global increases in fertilizer applications and offset CO 2 emissions. The pervasive underground hyphal networks of arbuscular mycorrhizal fungi (AMF) present an enticing bio‐stimulant carbon sink. We inoculated Sudan‐grass plants with eight genotypically distinct strains a model AMF species determine if strain identity affects plant growth storage. found that biomass, nutrient acquisition, stable soil inputs varied among strains, emphasizing the importance selection inoculants optimizing crop yield Summary Arbuscular are obligate root symbionts most improve by transferring nutrients into roots through hyphae. These represent sink soil; thus, it has been suggested these can also boost atmospheric storage, highlighting their potential role managing greenhouse In this study, we aimed whether certain genotypes nuclear organizations (homokaryons vs heterokaryons) associated higher rates host compared ( Sorghum × drummondii ) inoculation across Rhizophagus irregularis : four homokaryotic heterokaryotic strains. was grown chamber, which included 13 C‐CO pulse labeling track AMF. increased total belowground as well phosphorous, magnesium, manganese uptake host. Heterokaryons led greater less variable shoot phosphorous. Mycorrhizal mineral‐associated organic − highly persistent pool slow turnover were overall heterokaryons than homokaryons but significantly This indicates storage varies based on fungal genomic organization. Overall, improved resulted significant inter‐strain variation contributions soil. work highlights considering genotype assessments bio‐stimulants drivers

Language: Английский

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Differences in the physical protection mechanisms of soil organic carbon with 13C-labeled straw and biochar

Biochar, Journal Year: 2025, Volume and Issue: 7(1)

Published: Feb. 12, 2025

Language: Английский

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Phosphorus Fertilization Reduces Soil Microbial Necromass Carbon Content in Tillage Layer of Dry Farmland on Loess Plateau

Agriculture, Journal Year: 2025, Volume and Issue: 15(5), P. 485 - 485

Published: Feb. 24, 2025

This study examines how nitrogen and phosphorus fertilization influence soil microbial necromass carbon (MNC) content of farmland on the Loess Plateau, central Gansu. Based an extensive (6 years) experiment, a control (CK, no fertilization) three treatment groups employing different methods, namely, (N, 115 kg·ha−1), (P, combined (NP, kg·ha−1 each), were set up in this research. The results show that, tillage layer (within depth range 0–20 cm), application and/or phosphorous fertilizers can significantly reduce ratio between glucosamine muramic acid (GluN/MurA) (p < 0.05), with reduction 12.70–35.29%. Phosphorus also fungal (FNC) MNC their contributions to SOC 0.05). In addition, both increase bacterial (BNC) contribute Primarily because reduced accumulation efficiency FNC, decrease MNC. non-tillage 20–40 FNC soils impacts addition does not alter Total (TP), total (TN), pH, nitrogen-to-carbon biomass (MBN/MBC), leucine aminopeptidase (LAP), β-glucosidase activities (BG) are primary factors that affect changes BNC, summary, alone decreases contribution reduces pool stability layer. On contrary, its impact SOC, thus improving SOC.

Language: Английский

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Nitrogen-induced acidification increases soil organic carbon accrual by promoting particulate organic carbon and microbial necromass under long-term experiment in the paddy soils of East China

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: March 27, 2025

Background and aims Nitrogen (N) addition can substantially affect soil carbon cycling in agroecosystems. Microbial necromass (MNC) is widely recognized as a key contributor to organic C (SOC) fractions. However, the mechanisms underlying responses of MNC SOC fractions N fertilization paddy soils remain unclear. Methods A field experiment with four rates, namely, 0, 300, 450, 600 kg ha^–1 yr^–1 was conducted determine effects on fractions, microbial (MNC), enzyme activity, biomass rice–wheat rotation. Results increased POC concentrations by 2.88–8.41% 14.6–41.2%, respectively, but did not MAOC. The ratio MAOC reduced addition, indicating that decreased stability. concentration 7.32–22.5% its contribution 4.14–13.7%. activity β-1,4-N-acetyl-glucosaminidase decreased, while activities leucine amino peptidase acid phosphatase were under P addition. Structural equation modeling random forest revealed N-induced decrease pH promoted accrual increasing root biomass, consequently improving POC. Conclusions likely more vulnerable than acidification primary driver for promoting soils.

Language: Английский

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