As an important site for tourism activities,mountainous areas may generate greater tourism risks than plain areas due to potential natural disasters,social issues,scenic area management,and tourist behavior.Western Si...As an important site for tourism activities,mountainous areas may generate greater tourism risks than plain areas due to potential natural disasters,social issues,scenic area management,and tourist behavior.Western Sichuan Plateau is mostly mountainous area and tourism is its pillar industry,Therefore,the assessment of the tourism risks on the Western Sichuan Plateau is of academic value and practical significance.In this study,we use statistical and remote sensing data,fishbone diagram,and the entropy weighting method to construct a tourism risk evaluation model and classify risks into different levels,and we also use a geographic information system(GIS)for spatial mapping to quantify and spatialize the results.The objectives are 1)to identify the risk sources in the Western Sichuan Plateau and analyze their causal mechanisms,precisely reveal the distribution of tourism risks in the study area;2)improve the precision of tourism risk evaluation in scenic areas and analyze the causes and spatial distribution patterns of tourism risks and propose targeted management measures.This study found that the evaluation results of the four elements of hazard,exposure,vulnerability,and disaster prevention and mitigation capacity on the Western Sichuan Plateau showed significant spatial variability,depending on the natural conditions and the quantity difference of tourism resources in different regions.In addition,the tourism risk is low in most areas of the Western Sichuan Plateau,and disaster prevention and mitigation capacity is higher in areas with high tourism risk where attractions are densely populated and tourism is concentrated.Our study can provide a reference for future analyses of tourism risks in mountainous tourist areas such as in China and worldwide.展开更多
以降香黄檀(Dalbergia odorifera T. Chen)为材料,分析不同移植方式和外施钾肥等培育措施对其光合参数和叶绿素(Chl)含量的影响。结果显示,断根处理后植物的最大净光合速率(Pnmax)比去冠、全冠移、对照(CK)和去冠移4种处理方式分别提高...以降香黄檀(Dalbergia odorifera T. Chen)为材料,分析不同移植方式和外施钾肥等培育措施对其光合参数和叶绿素(Chl)含量的影响。结果显示,断根处理后植物的最大净光合速率(Pnmax)比去冠、全冠移、对照(CK)和去冠移4种处理方式分别提高了19.25%、34.79%、40.88%和219.86%。光合参数分析结果显示,光饱和点(LSP)最高的为去冠处理,光补偿点(LCP)最高的为断根处理。断根处理后植物的净光合速率(Pn)和蒸腾速率(Tr)最大。断根、去冠、全冠移3种处理的Chla、Chlb、Chl(a+b)含量及胡萝卜素均高于CK,且断根处理后上述各指标达到最高值。外施钾肥处理中,降香黄檀最大净光合速率随钾肥用量的增加而增加,K2处理下的LSP值最大。随着钾肥施用量的增加,植物叶片的Pn、气孔导度呈上升的趋势,且植株的Chla、Chlb和Chl(a+b)含量均随钾肥用量的增加而增加,CK处理下Chla/Chlb比值显著高于K1、K2处理。研究结果表明断根、去冠、施用钾肥等处理均可显著提升降香黄檀叶片的叶绿素含量,有利于植株进行光合作用,促进生长发育。展开更多
目的探讨益生菌、益生元和合生元降低维持性血液透析患者尿毒症毒素及改善微炎症状态的效果。方法计算机检索中国知网、中国生物医学文摘数据库、万方、维普及PubMed、Embase、Cochrane library、Web of Science建库至2019年2月关于维...目的探讨益生菌、益生元和合生元降低维持性血液透析患者尿毒症毒素及改善微炎症状态的效果。方法计算机检索中国知网、中国生物医学文摘数据库、万方、维普及PubMed、Embase、Cochrane library、Web of Science建库至2019年2月关于维持性血液透析患者使用微生物制剂(包括益生菌、益生元、合生元)的相关文献,根据纳排标准进行筛选,采用RevMan5.3进行Meta分析。结果共纳入文献10篇,患者共计481例。Meta分析显示,微生物制剂组患者硫酸对甲酚较对照组下降[MD(95%CI),P为-0.71(-1.37,-0.06),0.030],差异有统计学意义。在硫酸吲哚酚、C-反应蛋白、尿素及肌酐上无统计学差异,MD(95%CI),P分别为[-0.38,(-0.98,0.22),0.220],[-1.49,(-8.00,5.01),0.650],[1.48,(-3.79,6.75),0.580]和[-0.15,(-1.21,0.92),0.790]。结论微生物制剂对降低维持性血液透析患者蛋白结合类毒素有一定疗效,但真正应用于临床仍需要大样本多中心的随机对照研究及更严谨的研究设计支持。展开更多
基金Social Science Foundation of Liaoning Province(L21BJY028)。
文摘As an important site for tourism activities,mountainous areas may generate greater tourism risks than plain areas due to potential natural disasters,social issues,scenic area management,and tourist behavior.Western Sichuan Plateau is mostly mountainous area and tourism is its pillar industry,Therefore,the assessment of the tourism risks on the Western Sichuan Plateau is of academic value and practical significance.In this study,we use statistical and remote sensing data,fishbone diagram,and the entropy weighting method to construct a tourism risk evaluation model and classify risks into different levels,and we also use a geographic information system(GIS)for spatial mapping to quantify and spatialize the results.The objectives are 1)to identify the risk sources in the Western Sichuan Plateau and analyze their causal mechanisms,precisely reveal the distribution of tourism risks in the study area;2)improve the precision of tourism risk evaluation in scenic areas and analyze the causes and spatial distribution patterns of tourism risks and propose targeted management measures.This study found that the evaluation results of the four elements of hazard,exposure,vulnerability,and disaster prevention and mitigation capacity on the Western Sichuan Plateau showed significant spatial variability,depending on the natural conditions and the quantity difference of tourism resources in different regions.In addition,the tourism risk is low in most areas of the Western Sichuan Plateau,and disaster prevention and mitigation capacity is higher in areas with high tourism risk where attractions are densely populated and tourism is concentrated.Our study can provide a reference for future analyses of tourism risks in mountainous tourist areas such as in China and worldwide.
文摘以降香黄檀(Dalbergia odorifera T. Chen)为材料,分析不同移植方式和外施钾肥等培育措施对其光合参数和叶绿素(Chl)含量的影响。结果显示,断根处理后植物的最大净光合速率(Pnmax)比去冠、全冠移、对照(CK)和去冠移4种处理方式分别提高了19.25%、34.79%、40.88%和219.86%。光合参数分析结果显示,光饱和点(LSP)最高的为去冠处理,光补偿点(LCP)最高的为断根处理。断根处理后植物的净光合速率(Pn)和蒸腾速率(Tr)最大。断根、去冠、全冠移3种处理的Chla、Chlb、Chl(a+b)含量及胡萝卜素均高于CK,且断根处理后上述各指标达到最高值。外施钾肥处理中,降香黄檀最大净光合速率随钾肥用量的增加而增加,K2处理下的LSP值最大。随着钾肥施用量的增加,植物叶片的Pn、气孔导度呈上升的趋势,且植株的Chla、Chlb和Chl(a+b)含量均随钾肥用量的增加而增加,CK处理下Chla/Chlb比值显著高于K1、K2处理。研究结果表明断根、去冠、施用钾肥等处理均可显著提升降香黄檀叶片的叶绿素含量,有利于植株进行光合作用,促进生长发育。
文摘目的探讨益生菌、益生元和合生元降低维持性血液透析患者尿毒症毒素及改善微炎症状态的效果。方法计算机检索中国知网、中国生物医学文摘数据库、万方、维普及PubMed、Embase、Cochrane library、Web of Science建库至2019年2月关于维持性血液透析患者使用微生物制剂(包括益生菌、益生元、合生元)的相关文献,根据纳排标准进行筛选,采用RevMan5.3进行Meta分析。结果共纳入文献10篇,患者共计481例。Meta分析显示,微生物制剂组患者硫酸对甲酚较对照组下降[MD(95%CI),P为-0.71(-1.37,-0.06),0.030],差异有统计学意义。在硫酸吲哚酚、C-反应蛋白、尿素及肌酐上无统计学差异,MD(95%CI),P分别为[-0.38,(-0.98,0.22),0.220],[-1.49,(-8.00,5.01),0.650],[1.48,(-3.79,6.75),0.580]和[-0.15,(-1.21,0.92),0.790]。结论微生物制剂对降低维持性血液透析患者蛋白结合类毒素有一定疗效,但真正应用于临床仍需要大样本多中心的随机对照研究及更严谨的研究设计支持。
