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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(P<0.05),sediment discharge(P<0.01),and the sediment load coefficients(P<0.01)decreased *** relationship between the water 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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黄土高原生态系统碳汇时空变化及其影响因素

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水土保持研究 2025年第1期32卷 266-274,284页

作者：张怡王志慧卢小平肖培青赵广举河南理工大学测绘与国土信息工程学院河南焦作454003 黄河水利委员会黄河水利科学研究院水利部黄土高原水土保持重点实验室郑州450003 水利部交通运输部国家能源局南京水利科学研究院南京210029

[目的]探究黄土高原生态系统碳汇时空变化特征,可为深入分析和科学评估生态系统固碳能力以及制定应对气候变化的策略提供科学依据。[方法]基于现有长时间序列遥感产品、地形和土壤属性等数据,运用线性趋势分析和地理探测器等工具,计算了... 详细信息

[目的]探究黄土高原生态系统碳汇时空变化特征,可为深入分析和科学评估生态系统固碳能力以及制定应对气候变化的策略提供科学依据。[方法]基于现有长时间序列遥感产品、地形和土壤属性等数据,运用线性趋势分析和地理探测器等工具,计算了2000-2022年黄土高原净生态系统生产力(Net Ecosystem Productivity,NEP),分析了NEP时空变化及其影响因素。[结果]黄土高原2000-2022年NEP平均值为33.44 gC/m^(2),2022年黄土高原NEP现状水平为39.9 gC/m^(2),年碳汇总量达到25.40 Tg C。NEP年际变化特征表现为显著上升且逐渐趋于稳定,总体增长速率为0.70 gC/(m^(2)·a),每年增加0.45 Tg C,其中山西省和陕西省贡献最大。黄土高原森林植被的碳汇能力(NEP)和增汇能力(NEP趋势)虽最高,但由于草地面积较大,因此草地碳汇总量和增汇贡献均高于森林。与草地、农田和裸地相比,草地-森灌、农田-林草,裸地-林草等生态修复工程能提升原地表覆盖碳汇能力的83.2%,14.0%和81.1%,且提升增汇能力5.6%,15.8%,127.7%。单一影响因子中,NDVI作为植被生物量指标,是驱动黄土高原生态系统NEP时空动态变化的主要因素,然而NDVI与降雨、NDVI与土壤容重的交互作用对NEP空间分异以及NEP趋势变化的影响也不可忽视。[结论]结合气候特性和土壤条件的全面考量,通过调整土地利用结构和增加植物覆盖度等一系列生态恢复措施,可有效提升黄土高原生态系统碳汇能力。

关键词：黄土高原净生态系统生产力地理探测器影响因素碳汇

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Spatial-temporal Analysis and Prediction of Precipitation Extremes: A Case Study in the Weihe River Basin, China

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Chinese Geographical Science 2022年第2期32卷 358-372页

作者： QIU Dexun WU Changxue MU Xingmin zhao guangju GAO Peng State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationChinese Academy of Sciences and Ministry of Water ResourcesYangling 712100China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationNorthwest Agriculture and Forestry UniversityYangling 712100China

Extreme precipitation events bring considerable risks to the natural ecosystem and human *** the spatial-temporal characteristics of extreme precipitation and predicting it quantitatively are critical for the flood prevention and water resources planning and *** this study,daily precipitation data(1957–2019)were collected from 24 meteorological stations in the Weihe River Basin(WRB),Northwest China and its surrounding *** first analyzed the spatial-temporal change of precipitation extremes in the WRB based on space-time cube(STC),and then predicted precipitation extremes using long short-term memory(LSTM)network,auto-regressive integrated moving average(ARIMA),and hybrid ensemble empirical mode decomposition(EEMD)-LSTM-ARIMA *** precipitation extremes increased as the spatial variation from northwest to southeast of the *** were two clusters for each extreme precipitation index,which were distributed in the northwestern and southeastern or northern and southern of the *** precipitation extremes in the WRB present a strong clustering ***,the pattern of only high-high cluster and only low-low cluster were primarily located in lower reaches and upper reaches of the WRB,*** spots(25.00%–50.00%)were more than cold spots(4.17%–25.00%)in the *** spots were mainly concentrated in the northwestern part,while hot spots were mostly located in the eastern and southern *** different extreme precipitation indices,the performances of the different models were *** accuracy ranking was EEMD-LSTM-ARIMA>LSTM>ARIMA in predicting simple daily intensity index(SDII)and consecutive wet days(CWD),while the accuracy ranking was LSTM>EEMD-LSTM-ARIMA>ARIMA in predicting very wet days(R95 P).The hybrid EEMD-LSTM-ARIMA model proposed was generally superior to single models in the prediction of precipitation extremes.

关键词： precipitation extremes space-time cube(STC) ensemble empirical mode decomposition(EEMD) long short-term memory(LSTM) auto-regressive integrated moving average(ARIMA) Weihe River Basin,China

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Changes in sediment discharge in a sediment-rich region of the Yellow River from 1955 to 2010: implications for further soil erosion control

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Journal of Arid Land 2014年第5期6卷 540-549页

作者： JuYing JIAO ZhiJie WANG guangju zhao WanZhong WANG XingMin MU Institute of Soil and Water Conservation Northwest A&F University Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources

The well-documented decrease in the discharge of sediment into the Yellow River has attracted considerable attention in recent years. The present study analyzed the spatial and temporal variation of sediment yield based on data from 46 hydrological stations in the sediment-rich region of the Yellow River from 1955 to 2010. The results showed that since 1970 sediment yield in the region has clearly decreased at different rates in the 45 sub-areas controlled by hydrological stations. The decrease in sediment yield was closely related to the intensity and extent of soil erosion control measures and rainstorms that occurred in different periods and sub-areas. The average sediment delivery modulus（SDM） in the study area decreased from 7,767.4 t/（km^2·a） in 1951–1969 to 980.5 t/（km^2·a） in 2000–2010. Our study suggested that 65.5% of the study area with the SDM below 1,000 t/（km^2·a） is still necessary to control soil deterioration caused by erosion, and soil erosion control measures should be further strengthened in the areas with the SDM above 1,000 t/（km^2·a）.

关键词： sediment delivery modulus(SDM) Yellow River hydrological station(s)-controlled sub-area soil and water conservation

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老年脓毒症临床特点及死亡风险评估量表的建立和评价

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中华危重病急救医学 2025年第01期37卷 17-22页

作者：董服波罗黎文洪德江姚奕彭凯李文锦赵光举 325000

目的分析老年脓毒症患者的临床特征，识别影响其临床结局的关键因素，构建一套老年脓毒症患者死亡风险评估量表并评估其预测价值。方法采用回顾性病例对照研究方法，收集2021年9月至2023年9月温州医科大学附属第一医院重症监护病房（... 详细信息

目的分析老年脓毒症患者的临床特征，识别影响其临床结局的关键因素，构建一套老年脓毒症患者死亡风险评估量表并评估其预测价值。方法采用回顾性病例对照研究方法，收集2021年9月至2023年9月温州医科大学附属第一医院重症监护病房（ICU）收治的脓毒症患者的临床资料，包括患者的基本信息、临床特征及临床结局。根据年龄将患者分为非老年组（年龄<65岁）与老年组（年龄≥65岁），根据30 d生存状况进一步将老年组患者分为生存组与死亡组。分析老年脓毒症患者的临床特征。采用单因素和多因素Logistic回归分析筛选老年脓毒症患者30 d死亡的独立危险因素，并构建回归方程；通过简化回归方程建立死亡风险评估量表；比较不同评分对老年脓毒症患者预后的预测价值。结果 ①最终共纳入833例脓毒症患者，其中老年组485例，非老年组348例。与非老年组比较，老年组患者淋巴细胞、T细胞、CD8 + T细胞数量及T细胞和CD8 + T细胞比例更低〔淋巴细胞计数（×10 9 /L）：0.71（0.43，1.06）比0.83（0.53，1.26），T细胞数（个/μL）：394.0（216.0，648.0）比490.5（270.5，793.0），CD8 + T细胞数（个/μL）：126.0（62.0，223.5）比180.0（101.0，312.0），T细胞比例：0.60（0.48，0.70）比0.64（0.51，0.75），CD8 + T细胞比例：0.19（0.13，0.28）比0.24（0.16，0.34），均 P <0.01〕，自然杀伤细胞（NK细胞）数量、急性生理学与慢性健康状况评分Ⅱ（APACHEⅡ）、住院期间接受有创机械通气（IMV）比例、30 d病死率更高〔NK细胞数（个/μL）：112.0（61.0，187.5）比95.0（53.0，151.0），APACHEⅡ评分（分）：16.00（12.00，21.00）比13.00（8.00，17.00），IMV比例：40.6%（197/485）比31.9%（111/348），30 d病死率：28.9%（140/485）比19.5%（68/348），均 P <0.05〕，ICU住院时间更长〔d：5.5（3.0，10.0）比5.0（3.0，8.0）， P <0.05〕；两组C-反应蛋白（CRP）、降钙素原（PCT）、肿瘤坏死因子-α（TNF-α）、γ-干扰素（IFN-γ）、白细胞介素（IL-2、IL-4、IL-6、IL-10）等炎症指标差异均无统计学意义。② 485例老年脓毒症患者中，30 d生存345例，死亡140例，病死率为28.9%。与生存组比较，死亡组患者年龄更大，体质量指数（BMI）、白细胞计数（WBC）、PCT、血小板计数（PLT）更低，IL-6、IL-10、N末端脑钠肽前体（NT-proBNP）、总胆红素（TBil）、血乳酸（Lac）及住院期间IMV、连续性肾脏替代治疗（CRRT）比例更高；多因素Logistic回归分析显示，BMI〔优势比（ OR ）＝0.783，95%可信区间（95% CI ）为0.678～0.905， P ＝0.001〕、IL-6 （ OR ＝1.073，95% CI 为1.004～1.146， P ＝0.036）、TBil （ OR ＝1.009，95% CI 为1.000～1.018， P ＝0.045）、Lac （ OR ＝1.211，95% CI 为1.072～1.367， P ＝0.002）、住院期间接受IMV（ OR ＝6.181，95% CI 为2.214～17.256， P ＝0.001）是老年脓毒症患者30 d死亡的独立危险因素，建立回归方程：Logit P ＝1.012－0.244×BMI+0.070×IL-6+0.009×TBil+0.190×Lac+1.822×IMV；简化回归方程构建死亡风险评估量表，即BITLI评分。受试者工作特征曲线（ROC曲线）分析显示，BITLI评分预测死亡风险的ROC曲线下面积（AUC）为0.852（95% CI 为0.769～0.935），高于APACHEⅡ评分（AUC＝0.714，95% CI 为0.623～0.805）及序贯器官衰竭评分（SOFA；AUC＝0.685，95% CI 为0.578～0.793）；截断值为1.50分，敏感度及特异度分别为83.3%和74.0%。结论老年脓毒症患者淋巴细胞计数减少，病情危重，且预后不良。BMI、IL-6、TBil、Lac及住院期间接受IMV是老年脓毒症患者30 d死亡独立危险因素；基于上述危险因素构建的BITLI评分在预测老年脓毒症患者结局方面，较传统APACHEⅡ评分和SOFA评分更加精确可靠。

关键词：脓毒症老年死亡风险评估量表预后

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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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中国地理科学（英文版） 2025年第1期 163页

作者： WEN Yongfu LI Pengfei LI Mengzhen MA Chaohui GAO Peng MU Xingmin zhao guangju

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8例急性虫螨腈中毒的病例分析

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中华劳动卫生职业病杂志 2025年第1期43卷 72-74页

作者：王逸平陈隆望赵光举吴斌李萌芳卢中秋温州医科大学附属第一医院急诊医学中心温州

虫螨腈是广泛应用于农业的一种杀虫剂, 急性虫螨腈中毒患者死亡率高, 目前尚无有效治疗方法。本文总结了温州医科大学附属第一医院近期收治的8例急性虫螨腈中毒患者的临床资料, 包括临床表现, 辅助检查和治疗经过, 为疾病诊断和治疗提... 详细信息

虫螨腈是广泛应用于农业的一种杀虫剂, 急性虫螨腈中毒患者死亡率高, 目前尚无有效治疗方法。本文总结了温州医科大学附属第一医院近期收治的8例急性虫螨腈中毒患者的临床资料, 包括临床表现, 辅助检查和治疗经过, 为疾病诊断和治疗提供参考, 以提高临床医生对急性虫螨腈中毒的认识。

关键词：中毒虫螨腈病例报告治疗

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Runoff characteristics and its sensitivity to climate factors in the Weihe River Basin from 2006 to 2018

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Journal of Arid Land 2022年第12期14卷 1344-1360页

作者： WU Changxue Xu Ruirui QIU Dexun DING Yingying GAO Peng MU Xingmin zhao guangju State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationNorthwest A&F UniversityYangling 712100China State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationChinese Academy of Sciences and Ministry of Water ResourcesYangling 712100China University of Chinese Academy of Sciences Beijing 100000China

Exploring the current runoff characteristics after the large-scale implementation of the Grain for Green(GFG)project and investigating its sensitivities to potential drivers are crucial for water resource prediction and *** on the measured runoff data of 62 hydrological stations in the Weihe River Basin(WRB)from 2006 to 2018,we analyzed the temporal and spatial runoff characteristics in this *** analysis was used to investigate the relationships between different runoff indicators and climate-related ***,an improved Budyko framework was applied to assess the sensitivities of annual runoff to precipitation,potential evaporation,and other *** results showed that the daily runoff flow duration curves(FDCs)of all selected hydrological stations fall in three narrow ranges,with the corresponding mean annual runoff spanning approximately 1.50 orders of magnitude,indicating that the runoff of different hydrological stations in the WRB varied *** trend analysis of runoff under different exceedance frequencies showed that the runoff from the south bank of the Weihe River was more affluent and stable than that from the north *** runoff was unevenly distributed throughout the year,mainly in the flood season,accounting for more than 50.00%of the annual ***,the trend of annual runoff change was not obvious in most *** analysis showed that rare-frequency runoff events were more susceptible to climate *** this study,daily runoff under 10%-20%exceeding frequencies,consecutive maximum daily runoff,and low-runoff variability rate had strong correlations with precipitation,aridity index,and average runoff depth on rainy *** comparison,daily runoff under 50%-99%exceeding frequencies,consecutive minimum daily runoff,and high-runoff variability rate had weak correlations with all selected impact *** sensitivity analysis results suggested that the sensitivity of annual runoff to pre

关键词： daily runoff climate-related factors precipitation potential evaporation correlation analysis sensitivity analysis Weihe River Basin

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Decoupling effects of driving factors on sediment yield in the Chinese Loess Plateau

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International Soil and Water Conservation Research 2023年第1期11卷 60-74页

作者： Xiaojing Tian guangju zhao Xingmin Mu Pengfei Zhang Peng Gao Wenyi Sun Xiaoyan Lu Peng Tian State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationNorthwest A&F University26 Xinong RoadYangling712100Shaanxi ProvinceChina Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources26 Xinong RoadYangling712100Shaanxi ProvinceChina Yangtze Ecology and Environment Co Ltd.Wuhan430000Hubei ProvinceChina Erdos Hydrological Survey Bureau of Inner Mongolia Autonomous Region Erdos017010Inner MongoliaChina College of Natural Resources and Environment Northwest A&F University3 Taicheng RoadYangling712100Shaanxi ProvinceChina

Investigations of runoff and sediment yield changes and their relationships with potential driving factors provide good insights for understanding the mechanisms of hydrological *** study attempted to present a comprehensive investigation on the spatiotemporal variations of sediment yield in the Loess Plateau using continuous observed data at 46 hydrological stations during 1961-2016,and its responses to changes of precipitation,land use/cover and vegetation cover were analyzed by using the Partial Least Squares-Structural Equation Model(PLS-SEM).The results indicated that sediment yield reduced pro-nouncedly during 1961-2016 in the Loess Plateau,and 77.9%of this variation was explained by the combined effects of precipitation,land-use change,vegetation dynamics and runoff *** effects of precipitation,land-use change,and vegetation cover on sediment yield were 0.242,-0.528 and-0.630(P<0.05),respectively,and direct effect of runoff on sediment yield was 0.833(P<0.05).According to the Pearson Correlation Coefficient,the strongest positive correlation existed between annual sediment yield and runoff(r=0.88,P<0.05),followed by vegetation cover(r=-0.47,P<0.05)and land-use change(*** land and grassland)suggesting their significant trapping effects on soil ***,lower correlations were examined between sediment yield and precipitation indices(-0.14

关键词： Sediment yield Driving factors Correlation analysis PLS-SEM Loess Plateau

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Phase transition of DNA compaction in confined space: Effects of macromolecular crowding are dominant

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Chinese Physics B 2020年第1期29卷 489-494页

作者： Erkun Chen Yangtao Fan guangju zhao Zongliang Mao Haiping Zhou Yanhui Liu College of Physics Guizhou UniversityGuiyang 550025China Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices Pen-Tung Sah Institute of Micro-Nano Science and TechnologyXiamen UniversityXiamen 361005China Department of Computer Science and Engineering Shaoxing UniversityShaoxing 312000China

With a view of detecting the effects of macromolecular crowding on the phase transition of DNA compaction confined in spherical space,Monte Carlo simulations of DNA compaction in free space,in confined spherical space without crowders and in confined spherical space with crowders were performed *** simulation results indicate that macromolecular crowding effects on DNA compaction are dominant over the roles of multivalent *** addition,effects of temperature on the phase transition of DNA compaction have been identified in confined spherical space with different *** confined spherical space without crowders,the temperature corresponding to phase transition depends on the radius of the confined spherical space *** contrast,with the addition of crowders to the confined spherical space,effects of temperature on the phase transition of DNA compaction become insignificant,whereas the phase transition at different temperatures strongly depends on the size of crowder,and the critical volume fraction of crowders pertains to the diameter of crowder linearly.

关键词： macromolecular crowding Monte Carlo simulation DNA compaction phase transition

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