为明确酚酸类物质在连作植烟土壤中的变化特征,探讨土壤主要环境因子对酚酸类物质的影响,以不同连作年限(4 a, 6 a, 8 a, 14 a和16 a)植烟土壤为对象,研究了不同连作年限植烟土壤酚酸类物质、理化性状、酶活性和细菌多样性的变化特征,...为明确酚酸类物质在连作植烟土壤中的变化特征,探讨土壤主要环境因子对酚酸类物质的影响,以不同连作年限(4 a, 6 a, 8 a, 14 a和16 a)植烟土壤为对象,研究了不同连作年限植烟土壤酚酸类物质、理化性状、酶活性和细菌多样性的变化特征,并利用MantelTest分析了酚酸类物质与土壤主要环境因子的相关性。结果表明,随连作年限增加,土壤酚酸类物质和速效钾含量升高, pH、有机质含量、细菌菌群丰度和多样性降低,水解性氮和有效磷含量呈先降低后升高趋势,酶活性呈先升高后降低趋势。Mantel Test分析表明,土壤酚酸类物质含量与理化性状、酶活性和细菌丰度显著相关,且与理化性状相关性最高;不同酚酸类物质含量与土壤主要环境因子相关性存在差异,其中,对羟基苯甲酸和阔马酸与植烟土壤理化性状、酶活性以及细菌丰度的相关性最高。因此,在本试验条件下,连作植烟土壤酚酸类物质具有明显积累特征,植烟土壤环境恶化;酚酸类物质积累受理化性状、酶活性和细菌多样性影响,且理化性状影响最大;不同酚酸类物质受主要土壤环境因子的影响存在差异,其中对羟基苯甲酸和阔马酸积累所受影响最大。展开更多
目的分析大肠埃希菌耐药率(bacterial resistance rate,BRR)与抗菌药物使用强度(antibiotics use density,AUD)的相关性,为临床抗菌药物监管提供依据。方法从医院信息系统提取2017年1月—2023年6月的住院患者大肠埃希菌耐药率数据和22...目的分析大肠埃希菌耐药率(bacterial resistance rate,BRR)与抗菌药物使用强度(antibiotics use density,AUD)的相关性,为临床抗菌药物监管提供依据。方法从医院信息系统提取2017年1月—2023年6月的住院患者大肠埃希菌耐药率数据和22种抗菌药物的AUD数据。采用Mantel检验对细菌耐药情况进行整体分析,并以R语言进行可视化呈现。结果2017年1月—2023年6月大肠埃希菌对三代头孢菌素、喹诺酮类、三代头孢加酶制剂和碳青霉烯类药物的BRR均无明显增长趋势,平均BRR分别为53.0%、45.02%、6.75%和1.44%。对β-内酰胺类/β-内酰胺酶抑制剂的BRR与头孢哌酮舒巴坦和哌拉西林他唑巴坦AUD相关性最强,同时与头孢美唑、头孢西丁、头孢噻肟、头孢呋辛、美洛西林和磺苄西林AUD显著相关;对三代头孢类、喹诺酮类和碳青霉烯类的BRR与其相应制剂的AUD相关性均不显著,但对三代头孢平均BRR与阿莫西林克拉维酸钾和美洛西林AUD、对喹诺酮类BRR与头孢唑林和青霉素AUD呈现了相关性。结论细菌BRR与AUD之间存在的宏观量化关系较复杂,利用Mantel检验能够对AUD和BRR2组矩阵之间的相关性进行整体可视化分析,直观展现复杂多维数据的相关性,提高抗菌药物及细菌耐药监控效率,是制定抗感染治疗方案和抗菌药物管控方案有效手段。展开更多
Increasing concerns regarding aquatic ecological health and eutrophication driven by urbanization and human activities have highlighted the need to understand primary productivity(PP)dynamics in aquatic ecosystems. Th...Increasing concerns regarding aquatic ecological health and eutrophication driven by urbanization and human activities have highlighted the need to understand primary productivity(PP)dynamics in aquatic ecosystems. This study investigated the spatial distribution of PP across the Weihe River Basin, China using inverse distance weighting and analyzed the influence of different land uses and water physical-chemical parameters on PP using Mantel test and Spearman analysis. Significantly spatial heterogeneity in PP concentrations, ranging from 0.458 to 3262.807 mg C/(m^(2)·d), was observed with high-PP sites clustered in the middle-lower reaches dominated by farmland-construction land mosaics.Core drivers included light availability(Secchi depth and sunlight duration) and phytoplankton biomass(chlorophyll-a(Chl-a)), while water temperature exhibited threshold-dependent effects. Total organic carbon played dual roles, promoting PP concentrations in low-Chl-a regions, but suppressing it under high-Chl-a regions. Dual-scale buffer analysis(500 and 1000 m buffer zones) revealed PP heterogeneity stemed from interactive land use configurations, rather than isolated types. Balanced construction land-to-farmland ratio(0.467–2.890) elevated PP concentrations in human-dominated basins(the main stem of the Weihe River and Jinghe River), whereas excessive agricultural homogenization reduced PP likely due to fertilizer saturation and algal self-shading. Ecologically sensitive basins(the Beiluohe River Basin) demonstrated distinct patterns, in which PP concentration was regulated through natural-agricultural synergies. These results deepened the understanding of land use effects on aquatic PP,providing a theoretical basis for optimizing land use strategies to reconcile eutrophication control with ecological productivity in human-stressed basins.展开更多
文摘为明确酚酸类物质在连作植烟土壤中的变化特征,探讨土壤主要环境因子对酚酸类物质的影响,以不同连作年限(4 a, 6 a, 8 a, 14 a和16 a)植烟土壤为对象,研究了不同连作年限植烟土壤酚酸类物质、理化性状、酶活性和细菌多样性的变化特征,并利用MantelTest分析了酚酸类物质与土壤主要环境因子的相关性。结果表明,随连作年限增加,土壤酚酸类物质和速效钾含量升高, pH、有机质含量、细菌菌群丰度和多样性降低,水解性氮和有效磷含量呈先降低后升高趋势,酶活性呈先升高后降低趋势。Mantel Test分析表明,土壤酚酸类物质含量与理化性状、酶活性和细菌丰度显著相关,且与理化性状相关性最高;不同酚酸类物质含量与土壤主要环境因子相关性存在差异,其中,对羟基苯甲酸和阔马酸与植烟土壤理化性状、酶活性以及细菌丰度的相关性最高。因此,在本试验条件下,连作植烟土壤酚酸类物质具有明显积累特征,植烟土壤环境恶化;酚酸类物质积累受理化性状、酶活性和细菌多样性影响,且理化性状影响最大;不同酚酸类物质受主要土壤环境因子的影响存在差异,其中对羟基苯甲酸和阔马酸积累所受影响最大。
文摘目的分析大肠埃希菌耐药率(bacterial resistance rate,BRR)与抗菌药物使用强度(antibiotics use density,AUD)的相关性,为临床抗菌药物监管提供依据。方法从医院信息系统提取2017年1月—2023年6月的住院患者大肠埃希菌耐药率数据和22种抗菌药物的AUD数据。采用Mantel检验对细菌耐药情况进行整体分析,并以R语言进行可视化呈现。结果2017年1月—2023年6月大肠埃希菌对三代头孢菌素、喹诺酮类、三代头孢加酶制剂和碳青霉烯类药物的BRR均无明显增长趋势,平均BRR分别为53.0%、45.02%、6.75%和1.44%。对β-内酰胺类/β-内酰胺酶抑制剂的BRR与头孢哌酮舒巴坦和哌拉西林他唑巴坦AUD相关性最强,同时与头孢美唑、头孢西丁、头孢噻肟、头孢呋辛、美洛西林和磺苄西林AUD显著相关;对三代头孢类、喹诺酮类和碳青霉烯类的BRR与其相应制剂的AUD相关性均不显著,但对三代头孢平均BRR与阿莫西林克拉维酸钾和美洛西林AUD、对喹诺酮类BRR与头孢唑林和青霉素AUD呈现了相关性。结论细菌BRR与AUD之间存在的宏观量化关系较复杂,利用Mantel检验能够对AUD和BRR2组矩阵之间的相关性进行整体可视化分析,直观展现复杂多维数据的相关性,提高抗菌药物及细菌耐药监控效率,是制定抗感染治疗方案和抗菌药物管控方案有效手段。
基金jointly supported by the National Natural Science Foundation of China (42230513)Key Program of the Shaanxi Key Laboratory of Environmental Monitoring and Forewarning of Trace Pollutants (SHJKFJJ 202307)Research Project on Ecological Protection and High-Quality Development in the Yellow River Basin,China (2022-YRUC-01-0101)。
文摘Increasing concerns regarding aquatic ecological health and eutrophication driven by urbanization and human activities have highlighted the need to understand primary productivity(PP)dynamics in aquatic ecosystems. This study investigated the spatial distribution of PP across the Weihe River Basin, China using inverse distance weighting and analyzed the influence of different land uses and water physical-chemical parameters on PP using Mantel test and Spearman analysis. Significantly spatial heterogeneity in PP concentrations, ranging from 0.458 to 3262.807 mg C/(m^(2)·d), was observed with high-PP sites clustered in the middle-lower reaches dominated by farmland-construction land mosaics.Core drivers included light availability(Secchi depth and sunlight duration) and phytoplankton biomass(chlorophyll-a(Chl-a)), while water temperature exhibited threshold-dependent effects. Total organic carbon played dual roles, promoting PP concentrations in low-Chl-a regions, but suppressing it under high-Chl-a regions. Dual-scale buffer analysis(500 and 1000 m buffer zones) revealed PP heterogeneity stemed from interactive land use configurations, rather than isolated types. Balanced construction land-to-farmland ratio(0.467–2.890) elevated PP concentrations in human-dominated basins(the main stem of the Weihe River and Jinghe River), whereas excessive agricultural homogenization reduced PP likely due to fertilizer saturation and algal self-shading. Ecologically sensitive basins(the Beiluohe River Basin) demonstrated distinct patterns, in which PP concentration was regulated through natural-agricultural synergies. These results deepened the understanding of land use effects on aquatic PP,providing a theoretical basis for optimizing land use strategies to reconcile eutrophication control with ecological productivity in human-stressed basins.
