Drought-induced changes in rare microbial community promoted contribution of microbial necromass C to SOC in a subtropical forest

Soil Biology and Biochemistry, Journal Year: 2023, Volume and Issue: 189, P. 109252 - 109252

Published: Nov. 22, 2023

Language: Английский

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Long‐term nitrogen and phosphorus addition have stronger negative effects on microbial residual carbon in subsoils than topsoils in subtropical forests

Global Change Biology, Journal Year: 2024, Volume and Issue: 30(2)

Published: Feb. 1, 2024

Highly weathered lowland (sub)tropical forests are widely recognized as nitrogen (N)-rich and phosphorus (P)-poor, the input of N P affects soil carbon (C) cycling storage in these ecosystems. Microbial residual C (MRC) plays a crucial role regulating organic (SOC) stability forest soils. However, effects long-term addition on MRC across different layers remain unclear. This study conducted 12-year experiment two typical subtropical plantation dominated by Acacia auriculiformis Eucalyptus urophylla trees, respectively. We measured plant (fine root biomass, fine C, litter C), microbial community structure, enzyme activity (C/N/P-cycling enzymes), mineral properties, MRC. Our results showed that continuous reduced subsoil (20-40 cm) both plantations (A. auriculiformis: 28.44% E. urophylla: 28.29%), whereas no significant changes occurred topsoil (0-20 cm). decreased (25.44%), but had A. auriculiformis. Combined (34.63%) not urophylla. The factors varied layers. In (0-10 cm), (the relative contributions to total variance was 20%, hereafter) protection (47.2%) were dominant factors. layer 10-20 cm, characteristics (41.3%) (32.3%) substantial effects, deeper predominantly regulated (37.9%) (18.8%). Understanding differential drivers depth, particularly layers, is for accurately predicting SOC its responses chronic enrichment and/or increased limitation forests.

Language: Английский

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Deciphering microbiomes dozens of meters under our feet and their edaphoclimatic and spatial drivers

Global Change Biology, Journal Year: 2023, Volume and Issue: 30(1)

Published: Nov. 13, 2023

Abstract Microbes inhabiting deep soil layers are known to be different from their counterpart in topsoil yet remain under investigation terms of structure, function, and how diversity is shaped. The microbiome soils (>1 m) expected relatively stable highly independent climatic conditions. Much less known, however, on these microbial communities vary along climate gradients. Here, we used amplicon sequencing investigate bacteria, archaea, fungi fifteen 18‐m depth profiles at 20–50‐cm intervals across contrasting aridity conditions semi‐arid forest ecosystems China's Loess Plateau. Our results showed that bacterial fungal α archaeal community similarity declined dramatically remained soil. Nevertheless, still the functional potential N cycling, plant‐derived organic matter degradation, resource exchange, water coordination. had closer taxa–taxa bacteria–fungi associations more influence dispersal limitation than microbiome. Geographic distance was influential bacteria archaea topsoil. We further negatively correlated with deep‐soil richness, similarity, relative abundance plant saprotroph, associations, but increased aerobic ammonia oxidation, manganese arbuscular mycorrhizal soils. Root depth, complexity, volumetric moisture, clay play bridging roles indirect effects microbes work indicates that, even nutrient cycling susceptible changes availability, consequences for understanding sustainability dryland whole‐soil response aridification. Moreover, propose neglecting may underestimate role moisture future scenarios.

Language: Английский

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Role of genes encoding microbial carbohydrate-active enzymes in the accumulation and dynamics of organic carbon in subtropical forest soils

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 918, P. 170295 - 170295

Published: Jan. 24, 2024

Language: Английский

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Mixing of pine and arbuscular mycorrhizal tree species changed soil organic carbon storage by affecting soil microbial characteristics

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 930, P. 172630 - 172630

Published: April 26, 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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Aridity-driven divergence in soil microbial necromass carbon in alpine grasslands of the Tibetan Plateau

Biology and Fertility of Soils, Journal Year: 2024, Volume and Issue: 60(6), P. 799 - 812

Published: May 27, 2024

Language: Английский

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Global Distribution of Mercury in Foliage Predicted by Machine Learning

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(35), P. 15629 - 15637

Published: June 11, 2024

Foliar assimilation of elemental mercury (Hg

Language: Английский

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The global‐scale impacts of metallic nanoparticles on soil carbon dioxide emissions

Global Change Biology, Journal Year: 2024, Volume and Issue: 30(2)

Published: Jan. 29, 2024

Abstract Terrestrial ecosystems are increasingly being exposed to metallic nanoparticles (MNPs). However, the global‐scale impact of MNPs on soil carbon dioxide (CO 2 ) emission remains unknown, limiting our understanding role in global cycle. We compiled a dataset comprising 1764 pairs experimental observations investigate effects exposure respiration parameters, including rates, related enzyme activities, and microbial variables. found that could stimulate or suppress basal rates across environments, depending largely type MNPs. further showed that, although inhibition most activities peaked short‐term (≤28 days), prolonged still inhibited organic degradation. Finally, we determined environmental conditions (e.g., pH presence/absence plants) were also important regulators influence parameters. Our findings underline CO depended type, design, factors, which is critical for predicting influencing cycle climate change.

Language: Английский

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Effects of fallow and chemical fertilizer applications on soil carbon and nitrogen pools in North China Plain: Medium-term and long-term trends

Soil and Tillage Research, Journal Year: 2025, Volume and Issue: 248, P. 106450 - 106450

Published: Jan. 10, 2025

Language: Английский

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