基于后发优势理论的县域旅游产业发展研究——以安徽省休宁县为例

阐述了后发优势理论的源起、发展和应用于旅游业的情况。在此基础上,以安徽省休宁县为例,从六个方面对该县的旅游后发优势进行了阐述,并提出了基于后发优势的休宁县旅游业发展对策建议。     

长三角城市居民家庭直接能耗碳排放空间特征及影响因素研究

目前关于碳排放的研究主要以国家和行政省(自治区、直辖市)为研究对象,围绕城市尺度家庭层面碳排放的研究相对匮乏,而家庭是社会最基本的组成单位,针对相关的碳排放特征及影响问题亟待解决.本文以2007—2016年长三角地区26个地级市数据为样本,测算城市居民家庭直接能耗碳排放量.利用K均值聚类法、空间相关性检验及空间面板建模等方法,考察城市居民家庭直接能耗碳排放量的空间演变分布特征及影响因素.结果表明:①城市居民家庭直接碳排放量高的城市位于长三角中部偏东的位置,排放量低的城市集中在西部位置,中部地区的碳排放量增长速度普遍快于其他地区.②长三角地区城市居民家庭直接能耗碳排放的空间关联程度呈"N"字形趋势,处于高高集聚状态的区域集中在以苏州市等为核心的偏中部地区,处于低低集聚状态的区域集中在西部边缘地区.③前后5年的回归结果对比表明:户均人口数由不显著的正向影响因素转变为重要的抑制因素;户均私家车与每户拥有的城市道路面积联合效应的正向影响作用越来越强烈.研究结论可为城市在动态制定碳减排政策时提供理论依据.     

国家公园创建低碳景区模式研究——以汤旺河国家公园为例

国家公园独特的资源禀赋和优越的地理位置是创建低碳景区的重要基础。以汤旺河国家公园为例,分析其旅游发展现状,从四个方面探讨了国家公园创建低碳景区的模式,对国家公园低碳景区的建设具有现实的指导意义。     

Changes of DOM and its correlation with internal nutrient release during cyanobacterial growth and decline in Lake Chaohu, China

The seasonal changes in dissolved organic matter (DOM), and its correlation with the release of internal nutrients during the annual cycle of cyanobacteria in the eutrophic Lake Chaohu, China, were investigated from four sampling periods between November 2020 and July 2021. The DOM fluorescence components were identified as protein-like C1, microbial humic-like C2, and terrestrial humic-like C3. The highest total fluorescence intensity (F_T) of DOM in sediments during the incubation stage is due to the decomposition and degradation of cyanobacteria remains. The lowest humification of DOM and the highest proportion of C1 in waters during the initial cyanobacterial growth indicate that fresh algae are the main source. The highest molecular weight of DOM and F_T of the C2 in sediments during cyanobacterial outbreaks indicate the concurrent deposition of undegraded cyanobacterial remains and microbial degradation. The components of DOM are affected mainly by the dissolved total phosphorus in waters, while the temperature drives the annual cycle of cyanobacteria. The decreasing C1 in sediments and increasing nutrients in waters from the cyanobacterial incubation to outbreak indicate that mineralization of algal organic matter contributes importantly to the release of internal nutrients, with the strongest release of phosphorus observed during the early growth of cyanobacteria. The humic-like C2 and C3 components could also affect the dynamics of internal phosphorus through the formation of organic colloids and organic–inorganic ligands. The results show that the degradation of DOM leads to nutrients release and thus supports the continuous growth of cyanobacteria in eutrophic Lake Chaohu.     

Sequential biodegradation of TNT,RDX and HMX in a mixture

We describe TNT's inhibition of RDX and HMX anaerobic degradation in contaminated soil containing indigenous microbial populations. Biodegradation of RDX or HMX alone was markedly faster than their degradation in a mixture with TNT, implying biodegradation inhibition by the latter. The delay caused by the presence of TNT continued even after its disappearance and was linked to the presence of its intermediate, tetranitroazoxytoluene. PCR–DGGE analysis of cultures derived from the soil indicated a clear reduction in microbial biomass and diversity with increasing TNT concentration. At high-TNT concentrations (30 and 90 mg/L), only a single band, related to Clostridium nitrophenolicum, was observed after 3 days of incubation. We propose that the mechanism of TNT inhibition involves a cytotoxic effect on the RDX- and HMX-degrading microbial population. TNT inhibition in the top active soil can therefore initiate rapid transport of RDX and HMX to the less active subsurface and groundwater.     

基于信息扩散的城市区域风险研究

应用信息扩散原理,通过扩散函数对不完备信息进行适当的信息膨胀,建立观测样本和风险概率分布的映射关系,构建了基于信息扩散的城市区域安全生产风险计算模型.并以某市新北区的安全生产风险作为研究对象,选取该区域2005-2010年各年度建筑施工事故、火灾事故、工矿商贸事故的死亡人数和地区亿元GDP死亡率作为该区域安全生产风险的...     

Fast-response measurements of air pollution

Concentrations of sulphur and phosphorus compounds in the atmosphere were measured up to 50 times per second, with flame-photometric apparatus developed for the purpose, at distances of 4–4800 m from the source. Rates of change and autocorrelograms were determined, from which the distance of a point source can be estimated without knowledge of the source strength.     

The contribution of middle- and long-range transport of tropospheric photochemical ozone to pollution at a rural site in North-West England

Ground-level ozone measurements from a rural site in North-West England are presented. Two distinct types of polluted air mass are identified: one type having passed over the North Sea and Northern England, and the other having travelled from the continent via the South-East and Midlands of England. The former air mass type contains long-range transported ozone originating primarily within continental Europe, whilst the latter type contains both long-range transported ozone and ozone formed from precursors injected during passage of the air mass over middle-distance source areas in England. The monitoring results are compared with the predictions of recent theoretical models of ozone formation in polluted air masses and urban plumes.     

Research on the spatiotemporal evolution and influencing factors of green economic efficiency in the Yangtze River Economic Belt

Environmental Science and Pollution Research - In the Yangtze River Economic Belt (YREB), the green economy is an essential to sustainable economic development. In this study, we calculated a...     

安徽省旅游景区电子商务生态系统评价与分析

旅游电子商务的发展带来了对旅游景区电子商务应用的关注。在对旅游价值链和旅游产业集群研究的基础上,用电子商务生态系统观点分析了旅游景区电子商务的应用,给出旅游景区电子商务生态系统示意图,并建立评价指标,采用调查问卷形式分析这些指标的重要性的期望值排名,对安徽省18个旅游景区进行实证研究。该研究有助于从整体把握旅游景区各参与方在其中的地位和影响,对发展旅游电子商务应用有一定的实践参考价值。