Land use and urbanization indirectly control riverine CH4 and CO2 emissions by altering nutrient input

Water Research, Journal Year: 2024, Volume and Issue: 265, P. 122266 - 122266

Published: Aug. 14, 2024

Language: Английский

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Disentangling drivers of mudflat intertidal DOM chemodiversity using ecological models

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Aug. 5, 2024

Microorganisms consume and transform dissolved organic matter (DOM) into various forms. However, it remains unclear whether the ecological patterns drivers of DOM chemodiversity are analogous to those microbial communities. Here, a large-scale investigation is conducted along Chinese coasts resolve intrinsic linkages among complex intertidal pools, communities environmental heterogeneity. The abundance molecular formulae best fits log-normal distribution follows Taylor's Law. Distance-decay relationships observed for labile formulae, while latitudinal diversity gradients noted recalcitrant formulae. Latitudinal also features. Negative cohesion, bacterial diversity, traits main chemodiversity. Stochasticity analyses demonstrate that determinism dominantly shapes compositional variations. This study unveils mechanisms underlying from perspectives, deepening our understanding microbially driven chemical ecology. Intertidal similar microbes, suggesting there may exist universal models explaining both living non-living biological entities in Earth's biosphere.

Language: Английский

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Molecular activity mediates the composition and assembly of dissolved organic matter in lake sediments

Limnology and Oceanography, Journal Year: 2025, Volume and Issue: unknown

Published: March 7, 2025

Abstract Lake sediments are hotspots for carbon transformation and burial, where the turnover of dissolved organic matter (DOM), influenced by molecular activity, regulates global cycling. However, composition sediment DOM how its assembly mechanisms related to activity remain poorly understood. Here, 63 freshwater were collected from tropical cold temperate climatic zones in China. We explored underlying driven climate, physicochemical factors, microbes along gradient indicated number potential biochemical transformations which a molecule is involved. Sediment was dominated lipid‐ (35%) lignin‐like compounds (33%), latter enriched as increased. Besides, assemblage with higher had greater compositional similarity across different tended assemble deterministically. Specifically, average molecules increased 0.4 14, these structured shift stochastic deterministic processes, accounting ≥ 75% thereafter. Overall, assemblages primarily including total electrical conductivity. As increased, however, increasingly affected climate bacterial communities, consistent enhanced complexity bacterial–molecular networks. Collectively, our study highlights that regulated biotic abiotic factors further constrained intrinsic activity.

Language: Английский

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Diverse biological communities promote SOM molecular diversity and compositional transformations during natural fallow stage in paddy fields

Carbon Research, Journal Year: 2024, Volume and Issue: 3(1)

Published: Aug. 13, 2024

Abstract Monoculture cultivation patterns in agro-ecosystems only provide less varied soil organic matter (SOM) molecules of plant origin. Whether and how the natural fallow stage between seasons facilitates restoration SOM molecular diversity mitigates adverse impacts constant cropping pattern is elusive. Here, we utilized FT-ICR-MS, UHPLC-MS/MS, high-throughput sequencing to investigate biological change processes composition under status a long-farmed paddy field. Our study showed that increased by 45.70%–85.36% compared rice season. was positively correlated with bacterial root exudate diversity, negatively fungal diversity. Notably, accounted for 48.48% variation The attributed more diverse plant-produced than microbe-consumed molecules. Plant species turnover resulted conversion components Organoheterocyclic compounds Organic acids/derivatives from planting stage. Recruited microbes were dominated Basidiomycita , Ascomycot a, Acidobacteria Chloroflexi Proteobacteria resulting transformation carbohydrates, lipid-like lignin-like Both field microcosm experiments confirmed exudates are main source molecules, influenced microbial community. This provides solid evidence explosion biodiversity counteracts negative effects long-term monoculture on Graphical

Language: Английский

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Organic carbon decomposition temperature sensitivity positively correlates with the relative abundance of copiotrophic microbial taxa in cropland soils

Applied Soil Ecology, Journal Year: 2024, Volume and Issue: 204, P. 105712 - 105712

Published: Oct. 25, 2024

Language: Английский

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Watershed Urbanization Stimulates Riverine Ch4 and Co2 Emissions Controlled by Nutrients Input

Published: Jan. 1, 2024

Urban rivers are strongly influenced by human activities and have been hotspots for CH4 CO2 emissions. However, evaluating land use urbanization controls on carbon emissions across rural-urban at the watershed scale received less attention. In this study, a seasonal in situ survey was conducted typical river northern China to elucidate spatial temporal variations of CO2, as well relationship with its potential controlling factors. The results showed that were higher fall than other seasons, while peaked summer. average fluxes water-gas surface 1387.22±2474.98 µmol·m−2·d−1 52.78±54.44 mmol·m−2·d−1, respectively. Fluxes increased significantly urban section river, heterogeneity closely related proportion built-up area around sampling sites. explained 41% 53% variation concentrations, Water parameters 80.49% total concentrations fluxes. Structural equation models constructed based water area, TN, TP, DTC conductivity directly affected riverine emissions, standardized direct effects 0.502 0.486, pathway model indicated indirectly control altering nutrients input. We suggest management input effective ways reduce

Language: Английский

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Sediment Properties Strongly Drive Riverine Methane Emissions:A Case Study of the Liao River in Northern China

Published: Jan. 1, 2024

River and stream sediments serve as biogeochemical reactors of greenhouse gases, particularly methane. However, the understanding source identification process mechanisms river carbon emissions is still relatively vague. The Liao in northern China a typical watershed with heterogeneous sources water-sand disparate sediment properties. In this paper, we conducted situ surveys CH4 CO2 from its mainstem tributaries flood dry season. We found that seasonal patterns were consistent, peaks season, average fluxes 1636.04 ± 1803.75 µmol·m−2·d−1 59.66 44.60 mmol·m−2·d−1 respectively. Importantly, silt% significantly correlated concentration flux (R2 = 0.12−0.30), fine particles dominated organic matter availability redox conditions related to riverine production emissions. SEM demonstrated both grain size TOC% directly drove emissions, riverbed content together explained 65% composition indirectly controlled by altering substrate quality conditions. weakly dependent on anaerobic metabolism sediments. These findings expand our metabolic offer potential improve estimation regional or global networks reference

Language: Английский

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Urbanization and Nutrient Input Regulate Ch4 and Co2 Emissions in the Mainstem of the Liao River, Northeast China

Published: Jan. 1, 2024

Language: Английский

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Photoinduced Evolutions of Permafrost-Derived Carbon in Subarctic Thermokarst Pond Surface Waters

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(39), P. 17429 - 17440

Published: Sept. 18, 2024

In subarctic regions, rising temperature and permafrost thaw lead to the formation of thermokarst ponds, where organics from eroding accumulate. Despite its environmental significance, limited knowledge exists regarding photosensitivity permafrost-derived carbon in these ponds. this study, laboratory experiments were conducted explore photochemical transformations organic matter surface water samples ponds different environments northern Quebec, Canada. One pond near Kuujjuarapik is characterized by presence a collapsing palsa therefore organically rich, while other Umiujaq adjacent lithalsa thus contains fewer matters. Photobleaching occurred sample upon irradiation, whereas exhibited an increase light absorbance at wavelength related aromatic functionalities, indicating aging processes. Ultrahigh-resolution mass spectrometry analysis reveals that preferentially photoproduced highly unsaturated CHO compounds with great aromaticity, irradiated produced higher proportion CHON aromatics reduced nitrogen functionalities. Overall, study illustrates reactivity varies source matter. The observed differences contribute improved understanding emission volatile discovered earlier. Further insights into photoinduced evolutions may require classification therein.

Language: Английский

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Sediment properties control riverine methane emissions: A case study of the Liao River in northern China

Environmental Research, Journal Year: 2024, Volume and Issue: 263, P. 120076 - 120076

Published: Sept. 27, 2024

Language: Английский

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