The sustainable development of the marine economic system to accurately grasp the dynamic evolution characteristics and main driving factors of the vulnerability of the marine economic system so as to effectively iden...The sustainable development of the marine economic system to accurately grasp the dynamic evolution characteristics and main driving factors of the vulnerability of the marine economic system so as to effectively identify the problems in the operation of the marine economy is extremely important.Based on the establishment of a three-level assessment index system for the vulnerability of the marine economic system,the vulnerability of the marine economic system of Jiangsu Province in 2008-2016 was evaluated by using the comprehensive index model and the catastrophe progression model,and the results were compared based on the unified evaluation criteria.The main influencing factors were analyzed by principal component analysis and Pearson correlation analysis.It’s found that 2014,2015,and 2012 are in a general state,2009 and 2010 are in a poor state,and the vulnerability state from 2008 to 2011 is lower than that in 2012.The overall volatility is small indicating a stable system.Among them,the scale of marine industry and profit and loss of marine resources are the main components of marine economic system vulnerability having the highest correlation with the vulnerability of marine economic system.This study enriches the theoretical method and empirical research on the vulnerability of the marine economic system and has practical significance in allowing for timely targeted control measures to affect the vulnerability of the marine economic system.展开更多
Extensive urban land expansion and heavy industrialization have increased energy consumption and caused environmental problems, both of which present serious threats to humans. Consequently, improved land use efficien...Extensive urban land expansion and heavy industrialization have increased energy consumption and caused environmental problems, both of which present serious threats to humans. Consequently, improved land use efficiency and realization of green development are imperative. Based on a detailed analysis of spatial- temporal evolution of urban land use efficiency, this paper analyzes the synergistic effect of industrial structure and city size, as well as the effect of environmental quality, by using panel data from 283 cities at or above prefecture- level in China from 2003 to 2012. It was concluded that 1） environmental quality has an obvious ＂crowding out effect＂ on urban land use efficiency and 2） urban land use efficiency shows a significant spatial auto-correlation. The effect of industrial structure is dependent on popula- tion size of the city. It has been found that a threshold population size of more than 108.45 （10,000 persons） is needed for an optimized benefit from industrial linkages. The urban population size presents an inverted-U shape against the urban land use efficiency, and the marginal benefit of urban size increases when the industrial structure shifts from secondary industry to tertiary industry. Additionally we found that the actual urban size of 98.2% is less than the cities＇ optimal sizes.展开更多
基金This work was supported by the Jiangsu Social Science Fund[Research on temporal and spatial differentiation of vulnerability of marine economic system and its driving factors 19GLC013]Youth teacher research and development project of Nanjing Audit University[Selection and construction of evaluation index system for marine resources development 19QNPY019].
文摘The sustainable development of the marine economic system to accurately grasp the dynamic evolution characteristics and main driving factors of the vulnerability of the marine economic system so as to effectively identify the problems in the operation of the marine economy is extremely important.Based on the establishment of a three-level assessment index system for the vulnerability of the marine economic system,the vulnerability of the marine economic system of Jiangsu Province in 2008-2016 was evaluated by using the comprehensive index model and the catastrophe progression model,and the results were compared based on the unified evaluation criteria.The main influencing factors were analyzed by principal component analysis and Pearson correlation analysis.It’s found that 2014,2015,and 2012 are in a general state,2009 and 2010 are in a poor state,and the vulnerability state from 2008 to 2011 is lower than that in 2012.The overall volatility is small indicating a stable system.Among them,the scale of marine industry and profit and loss of marine resources are the main components of marine economic system vulnerability having the highest correlation with the vulnerability of marine economic system.This study enriches the theoretical method and empirical research on the vulnerability of the marine economic system and has practical significance in allowing for timely targeted control measures to affect the vulnerability of the marine economic system.
文摘Extensive urban land expansion and heavy industrialization have increased energy consumption and caused environmental problems, both of which present serious threats to humans. Consequently, improved land use efficiency and realization of green development are imperative. Based on a detailed analysis of spatial- temporal evolution of urban land use efficiency, this paper analyzes the synergistic effect of industrial structure and city size, as well as the effect of environmental quality, by using panel data from 283 cities at or above prefecture- level in China from 2003 to 2012. It was concluded that 1） environmental quality has an obvious ＂crowding out effect＂ on urban land use efficiency and 2） urban land use efficiency shows a significant spatial auto-correlation. The effect of industrial structure is dependent on popula- tion size of the city. It has been found that a threshold population size of more than 108.45 （10,000 persons） is needed for an optimized benefit from industrial linkages. The urban population size presents an inverted-U shape against the urban land use efficiency, and the marginal benefit of urban size increases when the industrial structure shifts from secondary industry to tertiary industry. Additionally we found that the actual urban size of 98.2% is less than the cities＇ optimal sizes.
