The application of human induced oxygen consumption and carbon emission theory in urban region was summed up and on this base a new model of urban carbon and oxygen balance (UCOB) was constructed by calculating the ca...The application of human induced oxygen consumption and carbon emission theory in urban region was summed up and on this base a new model of urban carbon and oxygen balance (UCOB) was constructed by calculating the carbon and oxygen fluxes. The purpose was to highlight the role of vegetation in urban ecosystems and evaluate the effects of various human activities on urban annual oxygen consumption and carbon emission. Hopefully,the model would be helpful in theory to keep the regional balance of carbon and oxygen,and provide guidance and support for urban vegetation planning in the future. To test the UCOB model,the Jimei District of Xiamen City,Fujian Province,China,a very typical urban region,was selected as a case study. The results turn out that Jimei′s vegetation service in oxygen emission and carbon sequestration could not meet the demand of the urban population,and more than 31.49 times of vegetation area should be added to meet the whole oxygen consumption in Jimei while 9.60 times of vegetation area are needed to meet the carbon sequestration targets. The results show that the new UCOB model is of a great potential to be applied to quantitative planning of urban vegetation and regional eco-compensation mechanisms.展开更多
Here the authors critically review the IPCC＇s claim that global warming is ＂very likely＂ caused by human activity： such a description underestimates the likelihood of the warming being due to this mechanism. Next ...Here the authors critically review the IPCC＇s claim that global warming is ＂very likely＂ caused by human activity： such a description underestimates the likelihood of the warming being due to this mechanism. Next examined are known alternative ＂natural＂ mechanisms which could give rise to the warming if, despite many claims, the man-made explanation was false because of compensation effects （greenhouse gases versus aerosol effects）. Also, a number of difficulties, as yet unresolved, in the human-induced warming explanation are considered.展开更多
基金Under the auspices of Key Direction in Knowledge Innovation Programs of Chinese Academy of Sciences (No. KZCX2-YW-450, KZCX2-YW-422)
文摘The application of human induced oxygen consumption and carbon emission theory in urban region was summed up and on this base a new model of urban carbon and oxygen balance (UCOB) was constructed by calculating the carbon and oxygen fluxes. The purpose was to highlight the role of vegetation in urban ecosystems and evaluate the effects of various human activities on urban annual oxygen consumption and carbon emission. Hopefully,the model would be helpful in theory to keep the regional balance of carbon and oxygen,and provide guidance and support for urban vegetation planning in the future. To test the UCOB model,the Jimei District of Xiamen City,Fujian Province,China,a very typical urban region,was selected as a case study. The results turn out that Jimei′s vegetation service in oxygen emission and carbon sequestration could not meet the demand of the urban population,and more than 31.49 times of vegetation area should be added to meet the whole oxygen consumption in Jimei while 9.60 times of vegetation area are needed to meet the carbon sequestration targets. The results show that the new UCOB model is of a great potential to be applied to quantitative planning of urban vegetation and regional eco-compensation mechanisms.
文摘Here the authors critically review the IPCC＇s claim that global warming is ＂very likely＂ caused by human activity： such a description underestimates the likelihood of the warming being due to this mechanism. Next examined are known alternative ＂natural＂ mechanisms which could give rise to the warming if, despite many claims, the man-made explanation was false because of compensation effects （greenhouse gases versus aerosol effects）. Also, a number of difficulties, as yet unresolved, in the human-induced warming explanation are considered.
