Changes in the Distribution of Thermokarst Lakes on the Qinghai-Tibet Plateau from 2015 to 2020

Remote Sensing, Journal Year: 2025, Volume and Issue: 17(7), P. 1174 - 1174

Published: March 26, 2025

Thermokarst lakes are widely distributed on the Qinghai-Tibet Plateau (QTP). However, owing to lack of high-precision remote sensing imagery and difficulty in situ monitoring permafrost regions, quantifying changes distribution thermokarst is challenging. In this study, we used four machine learning methods—random forest (RF), gradient boosting decision tree (GBDT), classification regression (CART), support vector (SVM)—and combined various environmental factors assess from 2015 2020 via Google Earth Engine (GEE). The results indicated that RF model performed optimally extraction lakes, followed by GBDT, CART, SVM. From 2020, number increased 52%, area expanded 1.6 times. A large proportion STK (with areas less than or equal 1000 m2) gradually developed into MTK between 10,000 central part QTP. Additionally, located primarily at elevations 4000 5000 m, with slopes ranging 0 5°, sand content approximately 65%. normalized difference water index (NDWI) enhanced vegetation (EVI) were most favourable for lake extraction. provide a scientific reference assessment prediction dynamic QTP future, which will have important significance studies carbon processes alpine ecosystems.

Language: Английский

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Assessment of soil microbial communities and diversity in typical coastal wetlands along a succession gradient: implications for reconstructing the long-term evolution of coastal wetlands

Environmental Technology & Innovation, Journal Year: 2025, Volume and Issue: unknown, P. 104263 - 104263

Published: May 1, 2025

Language: Английский

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Enhancing nitrogen removal in urban lake sediments through zero-valent iron coupled with biochar by intensifying heterotrophic denitrification

Journal of environmental chemical engineering, Journal Year: 2024, Volume and Issue: 12(5), P. 113798 - 113798

Published: Aug. 8, 2024

Language: Английский

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Role of Suprapermafrost Groundwater Recharge in Dissolved Organic Carbon Dynamics of Thermokarst Lakes

Journal of Earth Science, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 21, 2024

Language: Английский

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Investigating Soil Water Retention and Water Content in Retrogressive Thaw Slumps in the Qinghai-Tibet Plateau, China

Water, Journal Year: 2024, Volume and Issue: 16(4), P. 571 - 571

Published: Feb. 15, 2024

Retrogressive thaw slumps (RTSs) are becoming more common on the Qinghai-Tibet Plateau as permafrost thaws, but hydraulic properties of have not been extensively studied. To fill this knowledge gap, we used “space-for-time substitution method” to differentiate three stages RTSs: original grassland, collapsing, and collapsed. Our study included on-site investigations, measurements in laboratory, measured simulated analyses soil water retention curves estimated hydrological properties. findings show that were highly consistent across RTSs, indicating accuracy Van Genuchten model reproducing parameters for different RTSs. The grassland stage had highest content due its high organic carbon (SOC) fine-textured micropores. In contrast, collapsed higher compared collapsing stage, primarily increased proportions micropores, SOC content, lower bulk density (BD). From there significant changes structure each RTS site, which resulted a decrease an increase BD general. However, absence compaction led subsequent accumulation matter, increasing content. Changes field capacity, permanent wilting point, micropore distribution aligned with variations These highlight importance managing mitigate adverse effects freeze-thaw cycles stability at collapse Effective management strategies may include incorporating reducing compaction, maintaining optimal Further research is needed determine most suitable practices types environmental conditions.

Language: Английский

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Effects of groundwater level changes on soil characteristics and vegetation response in arid and semiarid coal mining areas

Environmental Geochemistry and Health, Journal Year: 2024, Volume and Issue: 46(11)

Published: Sept. 24, 2024

Language: Английский

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Development of root rot in Zanthoxylum bungeanum is closely linked to changes in soil microbial communities, enzyme activities, and physicochemical factors

Global Ecology and Conservation, Journal Year: 2024, Volume and Issue: 55, P. e03249 - e03249

Published: Oct. 10, 2024

Language: Английский

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Spatiotemporal Variation and Dynamics of Endogenous Nutrient Fluxes from Sediments in Hangzhou West Lake

ACS ES&T Water, Journal Year: 2023, Volume and Issue: 4(2), P. 476 - 491

Published: Oct. 30, 2023

This study conducts a comprehensive investigation of the sediment dynamics West Lake. The research finds intricate relationships between nutrient release and various environmental factors. Sedimentological tests suggest that concentrations TN, TP, NH4+-N in are mainly influenced by physicochemical properties overlying water. Laboratory experiments uncover temperature increase 2–3 °C can elevate phosphorus efflux from approximately 15%. presence submerged plants, areas with direct water diversion, is linked to decrease at rate about 25%. Analysis microbial communities samples indicates dominance Proteobacteria Bacteroidetes, which proposed play key role degrading organic matter recycling sediment. activity these microorganisms estimated reduce level 18%. Principal component analysis further verifies spatial heterogeneity among sampling sites, primary principal components explaining 68% variations. These findings not only provide insights into biogeochemical processes freshwater ecosystems but also underscore importance integrated management ensure long-term sustainability aquatic environments.

Language: Английский

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Effects of groundwater level changes on soil characteristics and vegetation response in arid and semiarid coal mining areas

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: July 29, 2024

Coal mining in arid and semiarid regions often leads to numerous ecological environmental problems, such as aquifer depletion, lake shrinkage, vegetation degradation, surface desertification. The drainage from coal activities is a major driving force the evolution of groundwater-soil-vegetation system. In this study, based on hydrogeological investigations Bojianghaizi watershed, used mathematical statistics, linear regression, correlation analyses elucidate impact groundwater level fluctuations soil characteristics response mechanism areas. results show that there significant negative between table (GWT) water content (SWC), conductivity, organic matter (SOM), available nitrogen (SAN), potassium (SAK). Mining lead destruction structure, which greatly weakened its ability retain nutrients. contents SWC, SOM, SAN area are significantly reduced, at least 49.73 %, 47.56 % 59.90 lower than those around area. As GWT increases less 0.5 m 0.5-7 m, then more 7 type study transitions hydrophilic halophytic species semi-dependent species, finally xerophilous species. This not only provides scientific basis for sustainable development protection similar mines world, but also has important significance guiding management rational utilization resources mine

Language: Английский

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Alpine SOC and Microbial Community Assembly Were Buffered Through Soil Pore Structure Along an Altitudinal Gradient

Land Degradation and Development, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 14, 2024

ABSTRACT Elevation changes influence various environmental factors including cloudiness, atmospheric density, and temperature. Previous studies on the effects of elevation microbial communities soil organic carbon (SOC) yielded inconsistent results. This study tried to reveal distribution patterns SOC concentrations, as well their interactions with structure along an elevational gradient in alpine region. We investigated six typical ecosystems north‐eastern Qinghai‐Tibet Plateau. Phospholipid fatty acid (PLFA) analysis X‐ray computed tomography (CT) methods were used quantify abundance pore soils, respectively. The results demonstrated that content total PLFAs peaked meadow ecosystem. In subsoil, PLFAs, fungal, bacterial followed U‐shape pattern increasing elevation. both topsoils subsoils, surface area density pores increased elevation, it was found be positively correlated abundance. Soil mainly affects input adsorption root nutrients by altering area, thereby regulating enrichment microorganisms. impact microbes more obvious topsoil than subsoil. Interactions among structure, properties, jointly communities, demonstrating indirectly through resource regulation.

Language: Английский

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