Exploring methanogenic archaea and their thermal responses in the glacier-fed stream sediments of Rongbuk River Basin, Mt. Everest DOI Open Access
Wei Ma, Lin Miao, Peiyi Shen

и другие.

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2024, Номер unknown

Опубликована: Ноя. 15, 2024

Abstract Glacier-fed streams (GFS) are emergent sources of greenhouse gas methane, and methanogenic archaea in sediments contribute largely to stream methane emissions. However, little is known about the communities GFS their key environmental driving factors. This study analyzed from Rongbuk River basin on Mount Everest for temperature responses through anaerobic microcosm incubations at 5°C 15°C. Diverse methanogens were identified, including acetoclastic, hydrogenotrophic, methylotrophic types. Substantial CO 2 production detected across altitudes increased significantly 15°C, with both rate negatively correlated altitude. While sensitivity but not CH 4 showed a negative altitude correlation. Methanogens substantially over long-term incubation, dominating archaeal community. At relative abundance several groups was strongly altitude, positive correlations observed Methanomassiliicoccaceae Methanoregulaceae , Methanocellaceae Methanotrichaceae respectively. Besides factors like phosphorus, C-to-N ratio, pH also affected structure, production, sensitivities. offers new insights into sediments, improving our understanding carbon cycling its potential climate change.

Язык: Английский

Elevated N2O emissions from coastal small water bodies: Implications for greenhouse gas inventories DOI

Lele Tang,

Wenjing Liu, Hong Yang

и другие.

Journal of Hydrology, Год журнала: 2025, Номер unknown, С. 132652 - 132652

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

1
Diverse Altitudinal Patterns and Drivers of Greenhouse Gas Dynamics in Southwest China Alpine Streams and Rivers DOI Creative Commons

Ying Wang,

Yuhao Li, Genxu Wang

и другие.

Journal of Geophysical Research Biogeosciences, Год журнала: 2025, Номер 130(2)

Опубликована: Фев. 1, 2025

Abstract Streams and rivers are globally significant sources of greenhouse gases (GHGs) to the atmosphere. However, GHG evasion from mountain streams remains poorly constrained due scarce data. In this study, we measured concentrations estimated fluxes riverine carbon dioxide (CO 2 ), methane (CH 4 nitrous oxide (N O) across three alpine catchments in Southwest China. these turbulent slightly oversaturated but much lower than global average, likely high gas transfer velocities that rapidly deplete GHGs. Headwater (first‐order) exhibited higher rates large (fourth‐order), despite having CO N O concentrations. The partial pressure dissolved decreased linearly with elevation, linked altitudinal patterns forest cover groundwater table depth. Dissolved CH GHGs showed weak relationships elevation. We observed seasonal differences fluxes, during wet season. spatial heterogeneity stream was primarily controlled by hydrology, climate, geomorphology. Our analyses also revealed were positively correlated water temperature, velocity, channel slope. This study demonstrates underestimated net GHGs, particularly O, highlighting importance headwater systems regional budgets. diverse dynamics suggest complex controls rivers.

Язык: Английский

Процитировано

0
Atmospheric CO2 sink caused by enhanced chemical weathering in the Rongbuk glacier runoff at the initial ablation, Mt. Qomolangma (Everest) DOI
Haiying Qiu, Guangjian Wu, Zhengliang Yu

и другие.

Journal of Hydrology, Год журнала: 2025, Номер unknown, С. 133200 - 133200

Опубликована: Март 1, 2025

Язык: Английский

Процитировано

0
Recent intensified riverine CO2 emission across the Northern Hemisphere permafrost region DOI Creative Commons
Cuicui Mu, Kun Li, Shaoda Liu

и другие.

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Апрель 16, 2025

Язык: Английский

Процитировано

0
Greenhouse gases, organic carbon, major and trace elements in ultra-small water bodies (<100 m2) of permafrost peatlands: Assessment across seasons and permafrost gradient DOI Creative Commons
Artem G. Lim, Rinat M. Manasypov,

Ivan V. Krickov

и другие.

Journal of Hydrology, Год журнала: 2025, Номер unknown, С. 133343 - 133343

Опубликована: Апрель 1, 2025

Язык: Английский

Процитировано

0
The spatial differentiation of alpine wetlands on the eastern Tibetan Plateau using multi-source remote sensing images DOI Creative Commons

J Zhang,

Haijun Wang, Xiangdong Kong

и другие.

Frontiers in Remote Sensing, Год журнала: 2025, Номер 6

Опубликована: Май 1, 2025

The alpine wetlands on the eastern Qinghai-Tibet Plateau (EQTP) serve as a critical global ecological barrier. Under dual pressures of climate change and human activities, these wetland systems face environmental challenges such retrogressive succession, aridification, desertification. Based Google Earth Engine (GEE) cloud computing platform, this study integrates high-resolution imagery, multi-source geoscience datasets, field survey samples. Object-based image analysis (OBIA), logistic regression, species distribution models (SDMs) were employed to systematically assess spatiotemporal differentiation characteristics key driving factors in EQTP. results indicate that: (1) When applying OBIA classification wetlands, resolution increased from 30 m 5 m, accuracy exhibited an improvement–saturation–fragmentation pattern. At 10 (Scale = 26), marsh structures spatial accurately identified, with total resource area 17,454.56 km 2 . (2) Wetland is driven by multiple factors, including (temperature, precipitation), topography (elevation, slope), activities (road density, settlement distribution). best explanatory performance for forces was observed at 500 scale (AUC 0.81), confirming that predominantly govern long-term changes, while significantly influence patterns. (3) During 2021–2040, under low-emission scenario, highly suitable zones larger than high-emission warming causing very high suitability shift toward higher elevations. From 2041 2060, regional intensified, excellent decreased. Between 2081 2100, high-carbon emission scenario temperature high-altitude central area, improving suitability. This proposes GEE-based method estimating resources, integrating regression SDMs reveal mechanisms wetlands. findings provide effective technical framework research Plateau.

Язык: Английский

Процитировано

0
CO2 Emissions From Low Order Tundra Streams Stimulated by Surface‐Subsurface Connectivity Following Extreme Rainfall Events DOI
Alina C. Spera, Vanessa L. Lougheed

Journal of Geophysical Research Biogeosciences, Год журнала: 2025, Номер 130(5)

Опубликована: Май 1, 2025

Abstract Increases to summer Arctic rainfall and tundra thermal degradation are altering hydrological cycling in coastal watersheds with implications for carbon (C) transport of C the atmosphere coast. riverine research has focused on large rivers; however, small streams contribute significantly vertical longitudinal dioxide (CO 2 ) fluxes. Despite well‐established connection between hydrology biogeochemistry, impact extreme events aquatic remains a knowledge gap. This study characterized how hydrology, geomorphology control supply CO low order their propensity act as atmospheric sources. We characterize biogeochemical hydrologic processes unique reaches from beaded stream impacted by erosion. Rainfall its resulting increases terrestrial‐aquatic connectivity drove movement biodegradable dissolved organic (BDOC) soils into streams, BDOC mineralization only contributed portion surface Rain likely stimulated benthic respiration, which led contributions net ecosystem production often exceeding fluxes downstream transport. In addition, played role streams. The erosion‐affected had inconsistent smaller inputs , weaker heterotrophic conditions, emissions. Understanding regime, influenced late rain morphology, controls metabolism will help improve predictions landscape scale emissions these critically understudied systems.

Язык: Английский

Процитировано

0
Exploring methanogenic archaea and their thermal responses in the glacier-fed stream sediments of Rongbuk River Basin, Mt. Everest DOI Open Access
Wei Ma, Lin Miao, Peiyi Shen

и другие.

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2024, Номер unknown

Опубликована: Ноя. 15, 2024

Abstract Glacier-fed streams (GFS) are emergent sources of greenhouse gas methane, and methanogenic archaea in sediments contribute largely to stream methane emissions. However, little is known about the communities GFS their key environmental driving factors. This study analyzed from Rongbuk River basin on Mount Everest for temperature responses through anaerobic microcosm incubations at 5°C 15°C. Diverse methanogens were identified, including acetoclastic, hydrogenotrophic, methylotrophic types. Substantial CO 2 production detected across altitudes increased significantly 15°C, with both rate negatively correlated altitude. While sensitivity but not CH 4 showed a negative altitude correlation. Methanogens substantially over long-term incubation, dominating archaeal community. At relative abundance several groups was strongly altitude, positive correlations observed Methanomassiliicoccaceae Methanoregulaceae , Methanocellaceae Methanotrichaceae respectively. Besides factors like phosphorus, C-to-N ratio, pH also affected structure, production, sensitivities. offers new insights into sediments, improving our understanding carbon cycling its potential climate change.

Язык: Английский

Процитировано

0