Carbon emissions from the building sector are an important part of China's carbon emissions,among which commercial buildings have high energy consumption per unit area,and roof greening technology has been proven to effectively reduce building carbon emissions,but the quantitative effect of its carbon reduction is not clear.In this paper,orthogonal experiments and software simulation methods are used to study the carbon reduction effect of key parameters of roof greening in commercial buildings in typical cities(Yulin,Xi'an,Ankang)in Shaanxi.The results show that the annual carbon emissions and coverage rate and soil substrate thickness of buildings are negatively correlated,and there is a non-monotonic law with plant height and solar energy absorption rate.Xi'an has the largest carbon reduction during the heating period,accounting for 3.7％of the carbon emissions during the entire heating period.The greening parameters have a significant influence on the carbon emissions of commercial buildings,and the higher the temperature in summer and the lower the temperature in winter,the better the carbon reduction effect of the green roof layer,and the daily carbon reduction of No.34 in the orthogonal test group is about 2～5 times that of No.1.This study provides certain theoretical suggestions and basis for carbon reduction and green roof design of commercial buildings.
key parameters of roof greeningcarbon emissions from buildingscommercial buildingsorthogonal testsensitivity analysis
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