Assessment Of Carbon Emission And Carbon Sink Levels And Land Use Optimization In Wuhan Under Low Carbon Target Orientation

Greenhouse gas emissions are an important factor influencing global climate change,affecting human health and sustainable social development in many ways,and have become a key environmental issue facing human society today.Rapidly urbanizing areas are the main source of carbon emissions,and the contradiction between carbon emissions caused by urban development and carbon sinks generated by regional ecological space has gradually intensified,affecting the low-carbon development of cities.Clarifying the spatial distribution and dynamic changes of carbon sources and sinks in cities is of great significance to the green development of cities and regions.In order to scientifically assess the level of carbon emissions and carbon sinks in Wuhan and to optimize its spatial pattern,this paper constructs a land-use carbon emission model to estimate net carbon emissions based on relevant data from 2010,2015 and 2020 land-use and statistical yearbooks,and uses an improved based on this model,we analyze the spatial and temporal variation characteristics and trends of carbon emissions and carbon sinks in Wuhan,identify the key problems of existing carbon imbalance and key constraint areas,and use the CLUE-S model to simulate the spatial pattern of land use in Wuhan under natural growth scenarios and low carbon development planning scenarios.Based on the simulation results,the spatial pattern optimization strategy for Wuhan under the low-carbon target-oriented scenario was proposed.The main findings of the study are as follows:(1)Carbon emissions from construction land in Wuhan are the main component of its carbon emission level.The assessment results show that the total carbon emissions from land use in Wuhan show a trend of increasing first and then decreasing and that Wuhan has significant spatial aggregation characteristics and the cold hot spot effect,and the aggregation effect of the spatial distribution of carbon emissions increases relatively over time,and the area generating high carbon emissions expands significantly from the central urban area to the ring of main urban areas.(2)The annual average value of net primary productivity(NPP)of vegetation in Wuhan shows a trend of increasing and then decreasing from 2010 to 2020,with a small increase in2020 compared with 2010,and a large fluctuation in the overall trend.The results of the assessment of the changing trend of carbon sink level in Wuhan show that the low carbon sink area spreads from the center to the periphery,with the mountainous area in the north being the high carbon sink area and its carbon sink function gradually decreasing,while the southern carbon sink function gradually increases.(3)According to the results of the previous assessment of carbon emissions and carbon sink levels in Wuhan,the general characteristics of the zoning statistics,using administrative divisions as the basic unit,are that carbon emissions are much larger than carbon absorption,and the carbon balance levels vary significantly between different zones.The carbon imbalance is more serious in Jiangxia,Xinzhou,Hongshan,and Caidian Districts,while Huangpi District has the highest carbon absorption,Xinzhou and Huangpi Districts are steadily improving their carbon balance,Hannan and East-West Lake Districts have some potential for carbon sinks,and the rest of the six administrative districts have a low carbon balance and no significant differences.(4)There are significant differences in land use changes in Wuhan under different scenarios.Under the natural growth scenario,the area of construction land grows to a greater extent and is spread out in the surrounding areas,while the area of woodland,grassland and water tends to be stable.The study investigates the dynamic changes of carbon emissions and carbon sinks in Wuhan,identifies the current carbon imbalance,combines the assessment results with development target simulations to obtain a more reasonable layout plan,and proposes a planning strategy for urban carbon sequestration and sink enhancement and a direction for optimizing the low carbon spatial pattern.