Spatiotemporal variations in eco-environmental quality and responses to drought and human activities in the middle reaches of the Yellow River basin, China from 1990 to 2022

Ecological Informatics, Journal Year: 2024, Volume and Issue: 81, P. 102641 - 102641

Published: May 8, 2024

The middle reaches of the Yellow River basin (MYRB) are among regions most severely affected by soil erosion globally. It has always held a pivotal role in and water conservation ecological restoration efforts China. Nonetheless, face recurrent drought occurrences growing human intervention, there have been notable alterations eco-environmental quality (EEQ) within MYRB. However, influences intervention on EEQ MYRB remain unclear. In this study, remote sensing index (RSEI) was applied to quantify spatiotemporal changes contributions land use type transitions from 1990 2022. results showed that fluctuated significantly exhibited weak overall improvement trend over past 33 years. proportion good excellent grades for improved, while poor fair decreased, especially northern regions. follows phased pattern. During periods 1990–2002 2011–2022, an improving is observed, period 2003–2010 shows no significant change EEQ. Drought had strongest influence 2003 2010, followed 2002, lesser impact 2011 primarily positively influenced spring, autumn winter droughts negatively summer droughts, arid grassland unused areas. improved during initial final phases projects, with drought. increase project implementation less noticeable, period.

Language: Английский

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Soil Salinity Reduces Soil Carbon Storage Mainly by Decreasing Inorganic Carbon in the Ring Tarim Basin of Xinjiang, China

Land Degradation and Development, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 24, 2025

ABSTRACT Saline soil is an important inorganic carbon pool and highly susceptible to environmental change. The Tarim Basin the largest inland basin around world, with saline land making up approximately 20% of its total area, while few research has been conducted on salt‐affected density distribution in region. To identify effect salinity density, we collected 135 profiles (0–100 cm), calculated organic (SOCD), (SICD), (STCD) their distribution, discussed relationships climate physicochemical properties. Results showed that average STCD, SOCD, SICD at 0–100 cm profile were 25.0, 3.7, 21.3 kg C m −2 , respectively. was 6.30–9.04 times higher than SOCD. vertical SOCD decreased increasing depth, whereas STCD increased. Soil had negative effects by reducing both SICD, impact degrees. Compared non‐salinity, 10.5%, 7.0% 10.5% under light, moderate, severe salinity, Random forest analysis indicated nitrogen content (STN) bulk (BD) most predictor variables for estimating SICD. significant correlation STN BD, resulting a Our findings emphasized reduced mainly reduction stocks increased degree. In addition, mitigation adverse STC could be considered density.

Language: Английский

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The Influence of Human Activities and Climate Change on the Spatiotemporal Variations of Eco-Environmental Quality in Shendong Mining Area, China from 1990 to 2023

Applied Sciences, Journal Year: 2025, Volume and Issue: 15(5), P. 2296 - 2296

Published: Feb. 21, 2025

The Shendong mining area is the largest coal production base in western China. Due to long-term activities, ecological environment quality (EEQ) of has undergone significant changes. Investigating evolution EEQ during process mineral resource exploitation great importance for sustainable development area. However, current research lacks a quantitative assessment contributions climate change and human activities spatiotemporal variations In this study, Remote Sensing Ecological Index (RSEI) was used as an evaluation metric. Theil–Sen slope estimation Mann–Kendall test were applied analyze changes from 1990 2023. Additionally, partial derivative method investigate response characteristics climatic factors quantify relative these two driving factors. results indicate that, over past 34 years, overall study shown improving trend. Compared 1990, proportions areas with good-grade excellent-grade 2023 increased by 28% 23.78%, respectively. second phase (2011–2023), average RSEI time series value significantly compared first (1990–2010). Among factors, annual precipitation had greatest impact on EEQ, contribution rate 0.085. conversion unused land forestland improved showing very increase RSEI, accounting 82.30%. region significant, slight increases smaller than conclusion, trend, being dominant factor 71.52% where increased, while 26.89% decreased.

Language: Английский

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Explainable Machine Learning Insights into Wetland Dynamics and Carbon Storage in the Irtysh River Basin

Earth Systems and Environment, Journal Year: 2025, Volume and Issue: unknown

Published: May 21, 2025

Language: Английский

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Spatiotemporal Dynamics and Driving Mechanism of Ecological Environment Quality in Piedmont-Oasis-Desert Ecotone Based on Long-term Harmonized Remote Sensing Ecological Index- Take Korla - Tiemenguan Oasis in Xinjiang as an Example

Environmental and Sustainability Indicators, Journal Year: 2025, Volume and Issue: unknown, P. 100611 - 100611

Published: Jan. 1, 2025

Language: Английский

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Ecological Environment Quality Assessment of Arid Areas Based on Improved Remote Sensing Ecological Index—A Case Study of the Loess Plateau

Sustainability, Journal Year: 2023, Volume and Issue: 15(18), P. 13881 - 13881

Published: Sept. 18, 2023

Ecosystems in arid and semi-arid areas are delicate prone to different erosive effects. Monitoring evaluating the environmental ecological condition such contribute governance restoration of ecosystem. Remote sensing indices (RSEIs) widely used as a method for monitoring have been extensively applied various regions. This study selects Loess Plateau research area, response existing on that predominantly uses vegetation indicators greenness factors. A fluorescence remote index (SRSEI) is constructed by using monthly synthesized sun-induced chlorophyll data during growth period new component combining it with MODIS product data. The generates RSEI SRSEI area spanning from 2001 2021. compares analyzes differences between two explores evolution patterns ecosystem quality over 21-year period. results indicate consistent positively correlated linear fitting trend changes newly exhibits higher correlation rainfall data, shows more significant decrease magnitude drought occurrences, indicating faster stronger area. largest proportions found area’s regions both substantial minor improvements, pointing an upward tendency Plateau’s development. can effectively evaluate

Language: Английский

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Mechanism controlling groundwater chemistry in the hyper-arid basin with intermittent river flow: insights from long-term observations (2001–2023) in the lower Heihe River, Northwest China

Frontiers in Environmental Science, Journal Year: 2024, Volume and Issue: 12

Published: May 20, 2024

The geochemical processes of groundwater in arid regions are generally influenced by both natural hydrological and human activities. However, impacts water-rock interactions on recharge via processes, controlled intermittent river water flow withdrawals, is still poorly understood. In this study, 327 chemistry datasets collected from the upper, middle (including Gobi riparian zones), lower Ejina Delta Northwest China 2001 to 2023 were analyzed. Our results revealed that total dissolved solids ( TDS ) concentration ranged approximately 881.5 ± 331.6 mg/L upper 1,953.6 1,208.5 regions, with an increasing trend observed. Ecological conveyance EWC ), recharging aquifer through flow, resulted a decrease concentrations mainly region. While irrigation notably affected region, resulting substantial increase salinity. Groundwater Middle region remained relatively stable over study period. Generally, hydrochemical composition shifted Na-Mg-SO 4 -HCO 3 Na-Mg-Ca-SO types -Cl Na-SO predominant Gobi. These shifts likely be attributed interplay interactions, coupled evaporation-crystallization processes. Inverse modeling using PHREEQC upper-middle primary involved calcite dissolution precipitation dolomite, gypsum, halite, sylvite salts, as well cation exchange reactions (2NaX+Ca 2+ →CaX 2 +2Na + ). contrast, hydrogeological system middle-lower exhibited opposite pattern interactions. Overall, ecological partially facilitated during lateral while disrupted hydrogeochemical equilibrium, involving halite compared other regions.

Language: Английский

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Long-Term Ecological and Environmental Quality Assessment Using an Improved Remote-Sensing Ecological Index (IRSEI): A Case Study of Hangzhou City, China

Land, Journal Year: 2024, Volume and Issue: 13(8), P. 1152 - 1152

Published: July 27, 2024

The integrity and resilience of our environment are confronted with unprecedented challenges, stemming from the escalating pressures urban expansion need for ecological preservation. This study proposes an Improved Remote Sensing Ecological Index (IRSEI), which employs humidity (WET), Normalized Difference Vegetation (NDVI), Land Surface Temperature (LST), a standardized Building–Bare Soil (NDBSI), aerosol optical depth (AOD), comprehensive salinity index (CSI). IRSEI model was utilized to assess quality Hangzhou over period 2003 2023. Additionally, random forest employed analyze factors driving quality. Furthermore, gradient effect in horizontal direction away center examined using buffer zone method. Our analysis reveals following: (1) approximately 95% alterations observed 2023 exhibited marginal improvements, declines, or were negligible; (2) transformations during this period, including variations surface temperature transportation networks, strong correlations (0.85) human activities. Moreover, influence AOD on demonstrated distinct spatial disparities; (3) remained generally stable up 30 km outside city center, indicating trend agglomeration significant areas surroundings. serves as robust framework bolstering assessment regional health, facilitating preservation rejuvenation efforts, fostering coordinated sustainable development.

Language: Английский

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Remote sensing ecological index (RSEI) affects microbial community diversity in ecosystems of different qualities

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 954, P. 176489 - 176489

Published: Sept. 23, 2024

Language: Английский

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Spatial–Temporal Changes and Driving Mechanisms of Ecological Environmental Quality in the Qinghai–Tibet Plateau, China

Land, Journal Year: 2024, Volume and Issue: 13(12), P. 2203 - 2203

Published: Dec. 16, 2024

This study examines the evolution of eco-environmental quality and its driving forces in Qinghai-Tibet Plateau, with a particular focus on Qinghai Lake region (QLR). By employing principal component analysis (PCA) nearly 20 years remote sensing data, we reveal dynamic characteristics ecological this sensitive area. The results indicate that QLR has exhibited significant fluctuations over past two decades, influenced by multiple factors such as climate change, human activities, policy adjustments. Specifically, are closely associated key indicators, including Normalized Difference Vegetation Index (NDVI), Land Surface Temperature (LST), Wetness (WET), Differential Bare Soil (NDBSI). cover moderate humidity have substantial positive effects quality, while high temperatures dry soil conditions exert negative impacts.

Language: Английский

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