Greenhouse gas emission of carbon dioxide（CO2） is one of the major factors causing global climate change.Urban green space plays a key role in regulating the global carbon cycle and reducing atmospheric CO2.Quantify...Greenhouse gas emission of carbon dioxide（CO2） is one of the major factors causing global climate change.Urban green space plays a key role in regulating the global carbon cycle and reducing atmospheric CO2.Quantifying the carbon stock,distribution and change of urban green space is vital to understanding the role of urban green space in the urban environment.Remote sensing is a valuable and effective tool for monitoring and estimating aboveground carbon（AGC） stock in large areas.In the present study,different remotely-sensed vegetation indices（VIs） were used to develop a regression equation between VI and AGC stock of urban green space,and the best fit model was then used to estimate the AGC stock of urban green space within the beltways of Xi＇an city for the years 2004 and 2010.A map of changes in the spatial distribution patterns of AGC stock was plotted and the possible causes of these changes were analyzed.Results showed that Normalized Difference Vegetation Index（NDVI） correlated moderately well with AGC stock in urban green space.The Difference Vegetation Index（DVI）,Ratio Vegetation Index（RVI）,Soil Adjusted Vegetation Index（SAVI）,Modified Soil Adjusted Vegetation Index（MSAVI） and Renormalized Difference Vegetative Index（RDVI） were lower correlation coefficients than NDVI.The AGC stock in the urban green space of Xi＇an in 2004 and 2010 was 73,843 and 126,621 t,respectively,with an average annual growth of 8,796 t and an average annual growth rate of 11.9%.The carbon densities in 2004 and 2010 were 1.62 and 2.77 t/hm2,respectively.Precipitation was not an important factor to influence the changes of AGC stock in the urban green space of Xi＇an.Policy orientation,major ecological greening projects such as ＂transplanting big trees into the city＂ and the World Horticultural Exposition were found to have an important impact on changes in the spatiotemporal patterns of AGC stock.展开更多
The creation of stock space is an important method for the current urban space renewal.Based on studying the connotations of ecological restoration and urban repair,this paper analyzed the development background and p...The creation of stock space is an important method for the current urban space renewal.Based on studying the connotations of ecological restoration and urban repair,this paper analyzed the development background and practical significance of urban stock space,put forward the methods for the creation of stock space,in order to realize the people-oriented values and the strategic view of sustainable development,and contribute to the future designs of urban stock space in China.展开更多
The Third Front construction played a crucial role in China’s socialist development,resulting in an excess of stock space after four decades of evolution. This study focuses on 113Third Front plants and mines in west...The Third Front construction played a crucial role in China’s socialist development,resulting in an excess of stock space after four decades of evolution. This study focuses on 113Third Front plants and mines in western Hubei to explore their contemporary reuse potential.Through field research and statistical analysis, the study examines the layout and conditions ofthese sites, utilizing the concept of “smart shrinkage” to assess their reuse value. Tools likethe minimum cumulative resistance (MCR) model, network analysis, and cluster analysis areemployed to develop a reuse value assessment model. The study finds that The Third Frontconstruction plants and mines were concentrated in the transition zone from the plains tothe mountains, and idleness and inefficiency became a common problem. These sites exhibita unique “non-urban, non-rural” layout and possess heritage, asset, and ecological values. Thestudy identifies various reuse strategies, including heritage preservation, property rights transformation, and ecological restoration through rewilding. These measures aim to revitalize theThird Front construction plants and mines, offering theoretical and methodological support fortheir sustainable development and potential recognition as world cultural heritage.展开更多
基金supported by the Forestry Research Foundation for the Public Service Industry of China (200904004)
文摘Greenhouse gas emission of carbon dioxide（CO2） is one of the major factors causing global climate change.Urban green space plays a key role in regulating the global carbon cycle and reducing atmospheric CO2.Quantifying the carbon stock,distribution and change of urban green space is vital to understanding the role of urban green space in the urban environment.Remote sensing is a valuable and effective tool for monitoring and estimating aboveground carbon（AGC） stock in large areas.In the present study,different remotely-sensed vegetation indices（VIs） were used to develop a regression equation between VI and AGC stock of urban green space,and the best fit model was then used to estimate the AGC stock of urban green space within the beltways of Xi＇an city for the years 2004 and 2010.A map of changes in the spatial distribution patterns of AGC stock was plotted and the possible causes of these changes were analyzed.Results showed that Normalized Difference Vegetation Index（NDVI） correlated moderately well with AGC stock in urban green space.The Difference Vegetation Index（DVI）,Ratio Vegetation Index（RVI）,Soil Adjusted Vegetation Index（SAVI）,Modified Soil Adjusted Vegetation Index（MSAVI） and Renormalized Difference Vegetative Index（RDVI） were lower correlation coefficients than NDVI.The AGC stock in the urban green space of Xi＇an in 2004 and 2010 was 73,843 and 126,621 t,respectively,with an average annual growth of 8,796 t and an average annual growth rate of 11.9%.The carbon densities in 2004 and 2010 were 1.62 and 2.77 t/hm2,respectively.Precipitation was not an important factor to influence the changes of AGC stock in the urban green space of Xi＇an.Policy orientation,major ecological greening projects such as ＂transplanting big trees into the city＂ and the World Horticultural Exposition were found to have an important impact on changes in the spatiotemporal patterns of AGC stock.
基金Sponsored by Hebei Provincial Graduates’ Model Course Construction Program (KCJSX2020081)
文摘The creation of stock space is an important method for the current urban space renewal.Based on studying the connotations of ecological restoration and urban repair,this paper analyzed the development background and practical significance of urban stock space,put forward the methods for the creation of stock space,in order to realize the people-oriented values and the strategic view of sustainable development,and contribute to the future designs of urban stock space in China.
基金supported by the National Natural Science Foundation of China(Grant Nos.51778252,52278018)the Science Foundation of the Ministry of Education of China(Grant No.20YJCZH192).
文摘The Third Front construction played a crucial role in China’s socialist development,resulting in an excess of stock space after four decades of evolution. This study focuses on 113Third Front plants and mines in western Hubei to explore their contemporary reuse potential.Through field research and statistical analysis, the study examines the layout and conditions ofthese sites, utilizing the concept of “smart shrinkage” to assess their reuse value. Tools likethe minimum cumulative resistance (MCR) model, network analysis, and cluster analysis areemployed to develop a reuse value assessment model. The study finds that The Third Frontconstruction plants and mines were concentrated in the transition zone from the plains tothe mountains, and idleness and inefficiency became a common problem. These sites exhibita unique “non-urban, non-rural” layout and possess heritage, asset, and ecological values. Thestudy identifies various reuse strategies, including heritage preservation, property rights transformation, and ecological restoration through rewilding. These measures aim to revitalize theThird Front construction plants and mines, offering theoretical and methodological support fortheir sustainable development and potential recognition as world cultural heritage.
