Study On Calculation Method Of Carbon Dioxide Emission During Life Cycle Of Architectural Landscape Architecture

In the face of global climate change,China announced a"two-carbon"goal in September2020,indicating that China will further elevate its low-carbon and green development to a new level.On October 16,2022,the"dual-carbon"target was first included in the report of the National Congress of the Communist Party of China,which boosted the confidence of the industrial sector in promoting green and high-quality economic development.The construction industry is an important contributor to carbon emissions.Since 2009,the total carbon emissions of the construction sector have soared,and the energy use situation is still very serious.As an indispensable part of architectural engineering,the carbon emissions generated by the life cycle of architectural landscape engineering can not be ignored.However,at the same time,the greening and planting of landscape architecture also produce the carbon sink that can not be ignored.Under the goal of"double carbon",how landscape industry can reduce the carbon emission produced in the process of its life cycle and improve the carbon sink ability has become a new topic facing the academic community.It is of great significance for reducing building carbon emission and is also the key way of low-carbon construction.Carbon emission calculation is an important content of low-carbon construction,but at present,there is still a lack of relevant standards for carbon emission calculation of architectural landscape engineering at home and abroad.Based on the summary of current research issues and combining with the characteristics of life cycle evaluation of architectural carbon emission,this paper proposes a calculation model for carbon emission of architectural landscape engineering life cycle.The calculation purpose,calculation range and calculation formula of carbon emission in the life cycle of architectural landscape engineering were clarified.At the same time,this paper calculated and sorted out the carbon emission factor database of common energy,materials,machinery platform,transportation and plant conservation in landscape architecture according to the existing research.And the carbon sink factor（kg CO₂/m²·a）or（kg CO₂/plant·a）database was calculated and sorted out based on the related research of plant carbon sink.Through the detailed calculation of the life cycle carbon emissions of a residential landscape engineering in Xi’an city,it is found that the carbon source material production stage（56%）and operation stage（35%）account for the highest proportion in the whole life cycle,accounting for 91%.The carbon sequestration and recycling of landscape green space make the community landscape engineering reach carbon neutrality in the whole life of about 30 years.Finally,the paper calculates and analyzes the life cycle carbon dioxide emissions of 10residential districts in Xi’an,finds out the rule,and analyzes the factors affecting carbon sources and sinks.It was found that the number of trees per 100 square meters and green land rate were positively correlated with the carbon sink per unit area,while the building density was negatively correlated with the carbon source per unit area.And summarize the emission reduction and increment strategies of architectural landscape engineering through collation and analysis,and then analyze the sensitivity of these emission reduction and increment strategies,and summarize the strategies that have a great impact on the emission reduction and increment of architectural landscape architecture.