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

et al.

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 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.

Language: Английский

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

Lele Tang,

Wenjing Liu, Hong Yang

et al.

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 132652 - 132652

Published: Jan. 1, 2025

Language: Английский

Citations

0
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

et al.

Journal of Geophysical Research Biogeosciences, Journal Year: 2025, Volume and Issue: 130(2)

Published: Feb. 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.

Language: Английский

Citations

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

et al.

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 133200 - 133200

Published: March 1, 2025

Language: Английский

Citations

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

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: April 16, 2025

Language: Английский

Citations

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

et al.

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 133343 - 133343

Published: April 1, 2025

Language: Английский

Citations

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

et al.

Frontiers in Remote Sensing, Journal Year: 2025, Volume and Issue: 6

Published: May 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.

Language: Английский

Citations

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

et al.

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 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.

Language: Английский

Citations

0