| Unbalanced economic development and congenital differences in natural resources cause significant differences in construction industry regional carbon emissions.There are problems that that the construction industry carbon emissions efficiency is low and the spatial distribution in the construction industry carbon emissions efficiency is uneven.To achieve emission reduction goals,So,it is vital to evaluate Construction of carbon emissions efficiency and Analyze the construction of carbon emissions efficiency of time and space distribution characteristics.In this paper,the construction industry's non-expected output CO2 replace energy consumption,as an important indicator of construction industry carbon efficiency evaluation.Regarding construction industry capital stock,labor,carbon emissions and machinery and equipment as input indicators ? the construction industry,economic output and construction area as output indicators,To build a input and output index system in the construction industry.And regard 45% reduction in construction carbon emission intensity in 2020 than 2005 as the sample unit,to establish Generalized DEA Model of construction carbon emissions efficiency evaluation.Analyze the status and forecast results of construction industry carbon emissions efficiency from the national level,regional level and provincial level.Regarding construction industry efficiency of carbon emissions from 2003 to 2020 as the research object,Through the spatial correlation analysis to reveal the time and space distribution Characteristics of carbon emissions efficiency in the construction industry.Finally,Strategy is proposed to improve the efficiency of carbon emissions in construction industry.The main results are as follows:The carbon emissions efficiency of construction industry has been increasing year by year.The comprehensive efficiency increased from 0.306 to 0.742,technical efficiency increased from 0.731 to 0.980,scale efficiency increased from 0.345 to 0.742 during 2003-2004.The carbon emissions efficiency of the eight regionals construction industry has been improved,but the efficiency level has significant difference.2003-2014,carbon emissions efficiency of the eastern coastal areas is the highest.Its comprehensive efficiency is 0.968,the technical efficiency is1.117,the scale efficiency is 0.868.Carbon emissions efficiency of the northwest region is the lowest.Its comprehensive efficiency is 0.160.the technical efficiency is 0.888,the scale efficiency is 0.184.The low scale efficiency is the reason why the comprehensive efficiency is not high.The scale efficiency of carbon emissions in the construction industry was only 0.554 from 2003 to 2014.It is only 0.794 from 2015 to2020.And regional and provincial scale efficiency is generally less than technical efficiency.The inputs redundancy in the construction industry showes a decreased tendency.The capital stock and the labor force of the construction industry redundancy are declining rapidly.But reduced emissions of carbon and mechanical equipment are slow.During the 2015-2020,carbon emissions redundancy is 11.4%,mechanical equipment redundancy is 14.7%.There is spatial aggregation of carbon efficiency in the construction industry.The overall Moran index of carbon efficiency is above 0.224.The number of provinces in the "High-High" region fluctuations increased,while the number of provinces in the "Low-Low" region fluctuations reduced.Efficiency of Carbon Emissions in construction industry achieve to transite from "Low-Low" Spatial Agglomeration to "High-High" type.After 2017,construction industry carbon emissions efficiency gradually formed a "high-high" type,"low-low" type of space gathered significantly. |
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