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Changes in River Cross-section Morphology and Response to Streamflow and Sediment Processes in Middle Reaches of Yellow River,China

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Chinese Geographical Science 2025年第1期35卷 161-174页

作者： WEN Yongfu LI Pengfei LI Mengzhen MA Chaohui GAO Peng MU Xingmin ZHAO Guangju The research center of soil and water conservation and ecological environment Chinese Academy of Sciences and Ministry of EducationYangling 712100China Institute of soil and water conservation Chinese Academy of Sciences&Ministry of Water ResourcesYangling 712100China University of Chinese Academy of Sciences Beijing 100049China Hebei University of water Resources and Electric Engineering Cangzhou 061001China Xi’an University of Science and Technology Xi’an 710054China Institute of soil and water conservation Northwest A&F UniversityYangling 712100China

Changes in river cross-section morphology have decisive influences on the flood discharge and sand transport capacity of rivers;thus,these changes strongly reflect the vitality of a *** this paper,based on the river cross-section and water and sediment data of two different periods(1974−1987 and 2007−2021),the trend analysis,change-point analysis and sediment rating curve method were used to analyze the change process of river cross-section morphology and its response to streamflow and sediment changes in the main river stream of the Yellow River at the Longmen hydrological *** 1974 to 1987(except in 1977),the riverbed experi-enced siltation,and the riverbed elevation ***,from 2007 to 2021,the riverbed experienced scouring,and the riverbed el-evation gradually *** cross-section shape changed from rectangular to U-shaped(deeper on the right side)at the Longmen *** changes in streamflow and sediment processes significantly impacted the evolution of river ***-flow(Pwater depth and sediment load coefficients followed a power *** decreasing trend in sediment discharge was sig-nificantly stronger than that in *** sediment particles tended to become *** sediment rating curve indicates that the sediment supply from upstream decreased while the erosive power in the river channel increased,leading to a gradual decline in riverbed elevation at the Longmen cross-section from 2007 to *** findings help us better understand the impacts of ecological restoration on changes in river streamflow and sediment during river evolution.

关键词： cross-section shape riverbed elevation water depth streamflow sediment discharge eco-restoration Longmen station middle reaches of the Yellow River,China

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Metagenomics reveals the resistance patterns of electrochemically treated erythromycin fermentation residue

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Journal of environmental Sciences 2025年第2期148卷 567-578页

作者： Jieya Zhou HaoWu Haiyan Wang ZongruWu Lihu Shi Shulei Tian Li-an Hou State Key Laboratory of environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China State Key Laboratory of water environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China Inner Mongolia Autonomous Region Solid Waste and soil ecological environment Technology center Hohhot 010020China

Erythromycin fermentation residue(EFR)represents a typical hazardous waste produced by the microbial pharmaceutical *** electrolysis is promising for EFR disposal,its microbial threats remain ***,metagenomics was coupled with the random forest technique to decipher the antibiotic resistance patterns of electrochemically treated *** showed that 95.75%of erythromycin could be removed in 2 *** temporarily influenced EFRmicrobiota,where the relative abundances of Proteobacteria and Actinobacteria increased,while those of Fusobacteria,Firmicutes,and Bacteroidetes decreased.A total of 505 antibiotic resistance gene(ARG)subtypes encoding resistance to 21 antibiotic types and 150 mobile genetic elements(MGEs),mainly including plasmid(72)and transposase(52)were assembled in *** linear regression models were identified among microbial richness,ARG subtypes,and MGE numbers(r^(2)=0.50-0.81,p<0.001).Physicochemical factors of EFR(Total nitrogen,total organic carbon,protein,and humus)regulated ARG and MGE assembly(%IncMSE value=5.14-14.85).The core ARG,MGE,and microbe sets(93.08%-99.85%)successfully explained 89.71%-92.92%of total ARG and MGE ***,gene aph(3 )-I,transposase tnpA,and Mycolicibacterium were the primary drivers of the resistance dissemination *** study also proposes efficient resistance mitigation measures,and provides recommendations for future management of antibiotic fermentation residue.

关键词： Erythromycin fermentation residue (EFR) Microbial pharmaceutical industry Disposal strategy Metagenomics Antibiotic fermentation residue management

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Impact of warming and nitrogen addition on soil greenhouse gas fluxes:A global perspective

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Journal of environmental Sciences 2025年第5期151卷 88-99页

作者： Hongze Ma Xiaoyu Jia Weiguang Chen Jingyi Yang Jin Liu Xiaoshan Zhang Ke Cui Zhouping Shangguan Weiming Yan State Key Laboratory of soil Erosion and Dryland Farming on the Loess Plateau College of Soil and Water Conservation Science and EngineeringNorthwest A&F UniversityYanglingShaanxi 712100China Institute of soil and water conservation Chinese Academy of SciencesYanglingShaanxi 712100China University of Chinese Academy of Sciences Beijing 100049China Shaanxi Institute of Geo-environment Monitoring Xi’an 710000China

Global warming and nitrogen(N)deposition have a profound impact on greenhouse gas(GHG)fluxes and consequently,they also affect climate ***,the global combined effects of warming and N addition on GHG fluxes remain to be fully *** address this knowledge gap,a globalmeta-analysis of 197 datasets was performed to assess the response of GHG fluxes to warming and N addition and their interactions under various climate and experimental *** results indicate that warming significantly increased CO_(2)emissions,while N addition and the combined warming and N addition treatments had no impact on CO_(2)***,both warming and N addition and their interactions exhibited positive effects on N_(2)O *** the combined warming and N addition treatments,warming was observed to exert a positive main effect on CO_(2)emissions,while N addition had a positive main effect on N_(2)O *** interactive effects of warming and N addition exhibited antagonistic effects on CO_(2),N_(2)O,and CH_(4)emissions,with CH_(4)uptake dominated by additive ***,we identified biome and climate factors as the two *** findings indicate that both warming and N addition substantially impact soil GHG fluxes and highlight the urgent need to investigate the influence of the combination of warming and N addition on terrestrial carbon and N cycling under ongoing global change.

关键词： Warming Nitrogen(N)addition Greenhouse gas(GHG)fluxes Interactive effects Biome

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Influence of ecological restoration on regional temperature-vegetation-precipitation dryness index in the middle Yellow River of China

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Journal of Mountain Science 2025年第2期22卷 636-651页

作者： CHEN Wei GUO Yuxing SUN Congjian School of Geographical Science Shanxi Normal UniversityTaiyuan 030031China research center for ecological environment in the Middle Reaches of the Yellow River Shanxi Normal UniversityTaiyuan 030031China

Drought is an important disaster factor disturbing the stability of the ecosystem in the middle reaches of the Yellow River(YRM).In this study,the spatiotemporal distribution of drought in the YRM from 2000 to 2021 was quantitatively investigated by constructing the TVPDI(Temperature-VegetationPrecipitation Dryness Index),and its driving mechanism was *** results show that:(1)a significant decreasing trend was observed in the regional annual TVPDI of the YRM,while the autumn TVPDI index showed an increasing trend during 2000-2021.(2)Plants are more susceptible to drought during the growing season.(3)Drought in YRM showed significant spatial heterogeneity,and the high gully area in the Loess Plateau and the earth-rocky mountain areas were less affected by drought than other regions.(4)The Structural Equation Model(SEM)indicated that regional soil moisture and vegetation coverage have a direct influence on regional TVPDI *** study has explored the regional differences of drought in different seasons and landforms in the YRM,providing a basis for carrying out targeted seasonal ecological management and refining regional environmental governance,as well as a reference for formulating differentiated ecological restoration and water resource allocation strategies according to local conditions.

关键词： Temperature Vegetation-Precipitation Dryness Index The middle reaches of the Yellow River Seasonal drought Regional drought

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Organic fertilizer enhances soil aggregate stability by altering greenhouse soil content of iron oxide and organic carbon

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Journal of Integrative Agriculture 2025年第1期24卷 306-321页

作者： Lijun Ren Han Yang Jin Li Nan Zhang Yanyu Han Hongtao Zou Yulong Zhang College of Land and environment Shenyang Agricultural University/National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources/Key Laboratory of Arable Land Conservation in Northeast ChinaMinistry of Agriculture and Rural AffairsShenyang 110866China

Both soil organic carbon (SOC) and iron (Fe) oxide content, among other factors, drive the formation and stability of soil ***, the mechanism of these drivers in greenhouse soil fertilized with organic fertilizer is not well *** a 3-year field experiment, we aimed to investigate the factors which drive the stability of soil aggregates in greenhouse *** explore the impact of organic fertilizer on soil aggregates, we established four treatments:no fertilization (CK);inorganic fertilizer (CF);organic fertilizer (OF);and combined application of inorganic and organic fertilizers(COF).The application of organic fertilizer significantly enhanced the stability of aggregates, that is it enhanced the mean weight diameter, geometric mean diameter and aggregate content (%) of>0.25 mm aggregate *** and COF treatments increased the concentration of SOC, especially the aliphatic-C, aromatic-C and polysaccharide-C components of SOC, particularly in>0.25 mm *** fertilizer application significantly increased the content of free Fe(Fed), reactive Fe (Feo), and non-crystalline Fe in both bulk soil and ***, non-crystalline Fe showed a positive correlation with SOC content in both bulk soil and *** non-crystalline Fe and SOC were significantly positively correlated with>2 mm mean weight ***, we believe that the increase of SOC, aromatic-C, and non-crystal ine Fe concentrations in soil after the application of organic fertilizer is the reason for improving soil aggregate stability.

关键词： organic fertilizer soil aggregates soil organic carbon iron oxides greenhouse soil

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Mapping the territories of the mountain-foothill zone of Tajikistan exposed to mudflows

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Journal of Mountain Science 2025年第1期22卷 16-30页

作者： SAFAROV Mustafo KANG Shichang FAZYLOV Ali GULAYOZOV Majid NAVRUZSHOEV Hofiz BANERJEE Abhishek MAMADJANOV Yunus Key Laboratory of Cryospheric Science and Frozen soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China research center for Ecology and environment of Central Asia(Dushanbe) Dushanbe 734063Tajikistan University of Chinese Academy of Sciences Beijing 100049China Institute of water Problems Hydropower and Ecology of the National Academy of Sciences of TajikistanDushanbe 734042Tajikistan Mountain Societies research Institute University of Central AsiaDushanbe 734000Tajikistan State Scientific Institution“center for research of Glaciers of the National Academy of Sciences of Tajikistan” Dushanbe 734025Tajikistan

In recent years,mudflows have emerged as a significant threat to infrastructure and lives,exhibiting increased frequency and *** study collectively addresses the rising threat of natural hazards,specifically mudflows in mountain-foothill zones in Tajikistan,utilizing UAV and remote sensing technologies to monitor their *** 2020 to 2023,we employed a QC-2 Micro UAV and a DJI Phantom 4 quadcopter to capture high-resolution aerial imagery across multiple affected districts,supplemented by pre-and post-event Sentinel-2 images analyzed using the Normalized Difference water Index(NDWI)and Normalized Difference Vegetation Index(NDVI).Our analysis revealed that 49 districts and cities experienced significant mudflow events,resulting in estimated damages and economic losses of 30.2 million USD,with particularly severe impacts noted in the Khuroson,Tojikobod,Vakhsh,Panjakent,Lakhsh,and *** composition of mudflows in the six studied areas predominantly consisted of clay,with some regions featuring mudstone and a few exhibiting a mixture of both *** findings indicate the predominance of rain-induced mudflows in foothill areas,contrasting with rain-snow,glacial,and lake-outburst-induced mudflows in mountainous *** underscores the urgent need for effective disaster risk management strategies in vulnerable *** UAV and remote sensing technologies provides crucial information for analyzing damages,identifying vulnerable areas,and advising emergency response efforts,thereby enhancing disaster risk management in Tajikistan.

关键词： Disaster Mudflows Remote sensing Unmanned aerial vehicles Tajikistan

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Occurrence Characteristics and Influencing Factors of Antibiotic Resistance Genes in Rural Drinking water in Henan Province

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Huanjing Kexue/environmental Science 2025年第3期46卷 1427-1434页

作者： Zhang, Kai Ma, Ge Li, Kuang-Jia Zou, Wei Yang, Feng-Xia Xin, Rui Huang, Yao Qiu, Yan-Zi Shi, Chao-Ge Wang, Qian Henan Key Laboratory for Synergistic Prevention of water and soil environmental Pollution School of Geographic Sciences Xinyang Normal University Xinyang464000 China Development research center Ministry of Water Resources Beijing100038 China Henan Key Laboratory of environmental Pollution Control Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control Ministry of Education College of Environment Henan Normal University Xinxiang453007 China Agro-environmental Protection Institute Ministry of Agriculture and Rural Tianjin300191 China Institute of Eco-environmental and soil Sciences Guangdong Academy of Sciences Guangzhou510650 China

Antibiotic resistance genes(ARGs)as a novel type of pollutant can lead to the ineffectiveness of antibiotics used in clinical treatment. The environment serves as an important reservoir for ARGs,and therefore,the migration and transformation of ARGs in the environment have attracted increasing attention in recent years. However,studies on the presence of ARGs in rural drinking water environments remain scarce. This study focused on Henan Province,a major agricultural province,where 35 samples of rural drinking water were collected and quantitatively analyzed for 16 types of ARGs belonging to seven classes,as well as the integrase gene intI1. The results showed that sulfonamide ARGs were the most widely distributed and heavily contaminated ARG types in rural drinking water environments in Henan Province. Although tetracycline ARGs ranked second to sulfonamide ARGs in terms of content,their detection rate was lower. Chloramphenicol ARGs had relatively low average relative abundance and detection rates,indicating that contamination from ARGs of antibiotics less commonly used in the rural drinking water environment in Henan was less severe. intI1 showed a positive correlation with most ARGs,suggesting its crucial role in the dissemination of ARGs in the drinking water environment. GDP did not affect the distribution of ARGs,indicating less difference in investment in the prevention and control of ARGs pollution in rural environments across different regions. The abundance of ARGs in drinking water from different types of water sources showed negligible difference,and the removal efficiency of ARGs from source water by drinking water treatment processes may be an important factor contributing to this phenomenon. © 2025 Science Press. All rights reserved.

关键词： Lead removal (water treatment)

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Runoff and Infiltration responses of revegetated slopes to clipping management on the northern Loess Plateau

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International soil and water conservation research 2024年第1期12卷 171-183页

作者： Qilin He Binbin Li Fengbao Zhang Nan Shen Mingyi Yang The research center of soil and water conservation and ecological environment Chinese Academy of Sciences and Ministry of EducationYanglingShaanxi712100China Institute of soil and water conservation Chinese Academy of Sciences and Ministry of Water ResourcesYanglingShaanxi712100China Institute of soil and water conservation Northwest A&F UniversityYanglingShaanxi712100China water and soil conservation Monitoring center of Ministry of water Resources Beijing100053China University of Chinese Academy of Sciences Beijing100049China

Large-scale vegetation restoration can reduce local watershed water yield,limit vegetation establishment and subsequent growth,and influence regional ecosystem *** management by reducing aboveground parts of grassland was gradually recommended and adopted in Grain-for-Green project management to offset these additional ***,scientific evaluation of the effectiveness of clipping management on infiltration and runoff processes is necessary for maintaining the stability of the surface water system and the sustainability of vegetation restoration in semi-arid regions.A field simulated rainfall experiment was conducted with four managed clipping grasslands(mainly bunge needlegrass and Stipa grandis),including no clipping,light clipping,heavy clipping,and complete clipping under three slope gradients(10,20,and 30°)and three rainfall intensities(60,90,and 120 mm/h)to explore the mechanism of runoff and infiltration responses to clipping using structural equation modeling and variation partitioning based on an SCS-CN *** results showed the runoff coefficient of the light clipping,heavy clipping,and complete clipping plots were 1.33,2.22,and 4.22 times that of the no clipping *** light clipping,heavy clipping,and complete clipping plots decreased the infiltration coefficients by 0%,5%,and 26%relative to the no clipping *** intensity dominated runoff and infiltration amounts,and clipping intensity's total effect was stronger than slope *** intensity and slope gradient were more influential on runoff with increasing rainfall *** mutual inhibition effect was between clipping intensity and slope gradient on *** order to maintain the sustainability of restoration,a 25-50%vegetation coverage after clipping maximizes the benefits of increasing runoff and maintaining enough soil water supply that prevents possible soil *** propose that future vegetation restoration policies should evaluate the appropriat

关键词： Runoff Infiltration Grassland clipping management SCS-CN model Structural equation model Variation partitioning

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Flow regime changes in three catchments with different landforms following ecological restoration in the Chinese Loess Plateau

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Journal of Arid Land 2020年第1期12卷 44-57页

作者： LUO Zhidong LIU Erjia QI Shi ZHAO Nan SUN Yun College of soil and water conservation Beijing Forestry UniversityBeijing 100083China water and soil conservation Monitoring center of Ministry of water Resources Beijing 100053China Key Laboratory of soil and water conservation of State Forestry Administration Beijing 100083China Engineering research center of Forestry ecological Engineering Ministry of EducationBeijing 100083China Shanxi Institute of soil and water conservation Taiyuan 030045China

The Chinese Loess Plateau is known as one of the most severe soil erosion regions in the *** ecological restoration projects,i.e.,the integrated soil conservation project since the 1970s and the''Grain for Green''project since 1999,have been progressively implemented to control the soil erosion in this *** restoration has greatly changed flow regime over the past five ***,the mechanism of how flow regime responds to ecological restoration among landforms remains poorly *** this study,we investigated the temporal dynamics of flow regime in three catchments,i.e.,Wuqi,Honghe and Huangling hydrological stations,respectively representing the loess hilly-gully,loess table-gully and rocky mountain(covered by secondary forest)areas in the Chinese Loess Plateau,using daily hydrological data during the 1960s–*** nonparametric Mann-Kendall test,Pettitt's test and daily flow series were used to investigate the changes of flow *** negative trends of annual streamflow were detected at the Wuqi and Honghe stations,except for the Huangling *** annual baseflow at the Wuqi station showed a significantly positive trend whereas a significantly negative trend was observed at the Honghe station,and there was no significant trend at the Huangling *** was interesting that baseflow index significantly increased during the whole period in all ***,the trends and change points of daily flow series derived by different percentages of exceedance and extreme series in different consecutive days varied among *** on the change points analysis of annual streamflow,we divided data series into three periods,i.e.,the baseline period(from 1959 and 1963 to 1979,PI),the integrated soil conservation period(1980–1999,PII)and the''Grain for Green''period(2000–2011,PIII).We found that streamflow decreased due to the reduction of high streamflow(exceeding 5%of time within a year)and median streamflow(50%)

关键词： change point extreme series hydrological data soil erosion streamflow changes

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Impact of Diuron Antifouling Paint on Fatty Acid Composition in Asian Sea-Bass “Lates calcarifer”

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Journal of Geoscience and environment Protection 2025年第1期13卷 18-30页

作者： Hassan Rashid Ali Tropical research center for Oceanography Environment and Natural Resources The State University of Zanzibar Zanzibar Tanzania Institute of Oceanography and environment University of Malaysia Terengganu Kuala Terengganu Malaysia

In recent decades, the application of antifouling paints to watercrafts has emerged as a significant concern in coastal ecosystems, including coral reefs. Diuron, a booster biocide commonly used as an antifouling agent, is persistent in soil, water, and groundwater. Although it exhibits moderate toxicity to mammals and birds, its primary breakdown product, 3,4-dichloroaniline, is highly toxic and environmentally persistent. The secondary toxicity of Diuron emphasizes its potential to contaminate groundwater. This investigation determined the 96-hour LC50 value for Diuron to be 1.627 ± 0.181 mg/L in Lates calcarifer. A 21-day sublethal exposure of Lates calcarifer to diuron did not yield statistically significant differences (P > 0.05) in fatty acid composition between the fresh and control groups. Both groups demonstrated polyunsaturated fatty acids (PUFAs) as the most abundant fatty acids, followed by saturated fatty acids (SFAs) and monounsaturated fatty acids (MUFAs). However, significant variations (P Lates calcarifer exposed to varying diuron concentrations (50%, 30%, and 10% of the LC50 value). The magnitude of these effects increased with increasing exposure levels. The results of this study indicate that diuron, even at concentrations considered safe, can adversely affect marine organisms, including alterations to their fatty acid composition.

关键词： Diuron Booster Biocide Antifouling Paint Fatty Acid Composition Lates calcarifer

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