Wetlands are widely distributed all over the world,and have many wildlife resources,which are the main pieces of the puzzle for natural resource conservation and sustainable development on earth and have important irr...Wetlands are widely distributed all over the world,and have many wildlife resources,which are the main pieces of the puzzle for natural resource conservation and sustainable development on earth and have important irreplaceability.In this paper,through questionnaire survey,field research,literature review,etc.,importance weight analysis was conducted by using principal component analysis,and field survey and questionnaire were carried out to collect data on ecological environment function,environmental protection function,landscape beautification function,disaster prevention and mitigation function of urban wetlands.The problems in wetland parks of Nanjing were discussed,such as lack of awareness of landscape planning,deficient late management of wetland parks,weak ability of sustainable development,and unreasonable landscape layout and function.Finally,corresponding solutions were proposed,such as adhering to the planning and design of urban wetland parks with green as the base and health as the basis,persisting in the construction of a wetland system with high biodiversity and near-natural characteristics,adhering to the principle of sustainable development,adopting the construction idea of symbiosis and circulation of urban wetland parks,strengthening education and publicity work,and paying attention to the organic combination of system protection and coordinated construction.The research can build a new development direction for the model of urban wetland parks and green healthy cities,and provide theoretical support for urban sustainable construction.展开更多
Driven by the concept of landscaping,this paper analyzed the impact of plant diversity on landscaping function,arrangement methods and community structure by taking plot sampling method as the experimental axis and 3 ...Driven by the concept of landscaping,this paper analyzed the impact of plant diversity on landscaping function,arrangement methods and community structure by taking plot sampling method as the experimental axis and 3 urban parks in Hefei as the blueprint.Six plots with the size of 20 m×20 m were selected for investigation.There were 56 species of plants belonging to 50 genera and 42 families in the plots of Zhongshan Road City Park,48 species of plants belonging to 44 genera and 40 families in the plots of Four Seasons Flower Sea City Park,and 69 species of plants belonging to 57 genera and 45 families in the plots of Xiaoyaojin Park.The survey results show that there are following problems in city parks:lack of plant effectiveness,too homogeneous plant community,disharmony between landscape and environment,poor plant maintenance and lack of attention to ecological maintenance.Based on this,the optimization measures are put forward:increasing evergreen plants to avoid no scenery in autumn,developing plants with excellent landscape effects and a variety of colorful plants,paying attention to the shaping of spatial structure and landscape pattern,regularly taking care of plants and their surrounding environment.It is expected to provide some reference for the construction and development of Hefei city parks,ensure the healthy and stable development of city parks,and provide ideas and methods for the improvement of plant landscaping in city parks.展开更多
基石投资者是香港IP O市场引导合理定价、提高发行效率的一项重要制度安排。本文对2013―2019年港股I P O进行实证分析,发现引入基石投资者可以提高IPO定价效率,帮助体量较大或估值较难的企业顺利上市,在低迷行情中起到市场稳定器的作用...基石投资者是香港IP O市场引导合理定价、提高发行效率的一项重要制度安排。本文对2013―2019年港股I P O进行实证分析,发现引入基石投资者可以提高IPO定价效率,帮助体量较大或估值较难的企业顺利上市,在低迷行情中起到市场稳定器的作用,但同时也存在个股流动性不足、利益输送等风险隐患。考虑到国内外形势复杂严峻,市场不确定性增强,注册制改革加速推进,新股稀缺性优势减弱,有必要借鉴香港基石投资者制度经验,进一步优化A股现行战略配售制度,合理稳定市场预期。同时,建议加强对参与战略配售投资者的信息获得、持股限售期以及信息披露等方面的监管力度。展开更多
基金the Innovation Training Planning Project for College Students in Anhui Province(AH202112216134)Key Project of Scientific Research Project of Higher Education of Anhui Province(Natural Science)(2022AH051861)+1 种基金Scientific Research Team Project of Anhui Xinhua University(kytd202202)Key Laboratory Project of Building Structure of General Universities in Anhui Province(KLBSZD202105).
文摘Wetlands are widely distributed all over the world,and have many wildlife resources,which are the main pieces of the puzzle for natural resource conservation and sustainable development on earth and have important irreplaceability.In this paper,through questionnaire survey,field research,literature review,etc.,importance weight analysis was conducted by using principal component analysis,and field survey and questionnaire were carried out to collect data on ecological environment function,environmental protection function,landscape beautification function,disaster prevention and mitigation function of urban wetlands.The problems in wetland parks of Nanjing were discussed,such as lack of awareness of landscape planning,deficient late management of wetland parks,weak ability of sustainable development,and unreasonable landscape layout and function.Finally,corresponding solutions were proposed,such as adhering to the planning and design of urban wetland parks with green as the base and health as the basis,persisting in the construction of a wetland system with high biodiversity and near-natural characteristics,adhering to the principle of sustainable development,adopting the construction idea of symbiosis and circulation of urban wetland parks,strengthening education and publicity work,and paying attention to the organic combination of system protection and coordinated construction.The research can build a new development direction for the model of urban wetland parks and green healthy cities,and provide theoretical support for urban sustainable construction.
基金Sponsored by Undergraduate Innovation Training Program Support Project of Anhui Province(S202112216139)Key Project of Scientific Research Project(Natural Science)of Colleges and Universities in Anhui Province(2022AH051861)+1 种基金Research Team Project of Anhui Xinhua University(kytd202202)Building Structure Key Laboratory Project of Colleges and Universities in Anhui Province(KLBSZD202105).
文摘Driven by the concept of landscaping,this paper analyzed the impact of plant diversity on landscaping function,arrangement methods and community structure by taking plot sampling method as the experimental axis and 3 urban parks in Hefei as the blueprint.Six plots with the size of 20 m×20 m were selected for investigation.There were 56 species of plants belonging to 50 genera and 42 families in the plots of Zhongshan Road City Park,48 species of plants belonging to 44 genera and 40 families in the plots of Four Seasons Flower Sea City Park,and 69 species of plants belonging to 57 genera and 45 families in the plots of Xiaoyaojin Park.The survey results show that there are following problems in city parks:lack of plant effectiveness,too homogeneous plant community,disharmony between landscape and environment,poor plant maintenance and lack of attention to ecological maintenance.Based on this,the optimization measures are put forward:increasing evergreen plants to avoid no scenery in autumn,developing plants with excellent landscape effects and a variety of colorful plants,paying attention to the shaping of spatial structure and landscape pattern,regularly taking care of plants and their surrounding environment.It is expected to provide some reference for the construction and development of Hefei city parks,ensure the healthy and stable development of city parks,and provide ideas and methods for the improvement of plant landscaping in city parks.
文摘基石投资者是香港IP O市场引导合理定价、提高发行效率的一项重要制度安排。本文对2013―2019年港股I P O进行实证分析,发现引入基石投资者可以提高IPO定价效率,帮助体量较大或估值较难的企业顺利上市,在低迷行情中起到市场稳定器的作用,但同时也存在个股流动性不足、利益输送等风险隐患。考虑到国内外形势复杂严峻,市场不确定性增强,注册制改革加速推进,新股稀缺性优势减弱,有必要借鉴香港基石投资者制度经验,进一步优化A股现行战略配售制度,合理稳定市场预期。同时,建议加强对参与战略配售投资者的信息获得、持股限售期以及信息披露等方面的监管力度。
