Study On The Value Of Ecosystem Services And Carbon Emissions In Yulin City

At present,ecological environmental protection is imminent and climate change,mainly global warming,is becoming more and more obvious,and these factors are forcing human lifestyle and production methods to undergo green transformation.In view of this,many scholars at home and abroad have focused their research on land use and ecological security,spatial and temporal variability characteristics and influence factors of ecosystem service value based on land use,carbon emission response based on land use data,simulation prediction of land use carbon emission and influence factors,etc.Through combing the existing literature,it is found that the studies combining ecosystem service value and land use carbon emission are relatively.There are few studies combining ecosystem service values and land use carbon emissions.Based on the land use change data in Yulin City from 1990 to 2020,this paper presents the land use dynamics,land use migration matrix,ecosystem services value estimation method,ecosystem services value sensitivity and ecosystem services value rate of change,The land use carbon emission estimation method,land use carbon emission intensity per population,land use carbon emission intensity per unit of GDP and the spatial correlation method were used to analyse the land use change,ecosystem services value and land use carbon emissions in Yulin City between 1990 and 2020.Carbon emission intensity per unit GDP and the spatial correlation method were used to analyse land use change,ecosystem services value and land use carbon emissions in Yulin City between 1990 and 2020,and to examine the spatial relationships between ecosystem services value and carbon emissions in Yulin City over a 30-year period.The main findings are as follows:(1)Percentage ratio of land use types in Yuilin City from 1990 to 2020: grassland,farmland,unused land,forest land,water area,and built-up land The most dynamic land use type in Yuilin City from 1990 to 2020 is built-up land,followed by forest land and unused land.The overall dynamics of elm forest utilisation for the period 1990-2020 is 0.19%,while it is 0.30%,0.25% and 0.13% for the three periods 1990-2000,2000-2010 and 2010-2020,respectively.1990-2020 land use transfer changes in Yulin City are mainly concentrated in the six northern counties,and the transfer changes in the six southern counties are small.The land use characteristics of the various districts in Yulin generally consist of forest land,grassland,and developed land reclaimed from unused agricultural land.(2)The increase in the value of ecosystem services in Yulin City from 1990 to 2020 is4.07%.In terms of value composition,grassland in Yulin City has the highest percentage of ecosystem service value,above 55% in all four years.1990-2020,the spatial distribution pattern of ecosystem service value in Yulin City shows the characteristics of low in the six northern counties and high in the six southern counties.1990-2020,the contribution rate of woodland,grassland and watershed in Yulin City is positive,among which the positive contribution rate of grassland is the largest;the contribution rate of cropland,construction land The contribution rates of forest land,grassland and watershed are positive,among which grassland has the largest positive contribution rate;the contribution rates of arable land,construction land and unused land are negative,among which construction land and arable land have larger negative contribution rates.(3)The total carbon emission of each land use type in Yulin City from 1990 to 2020 is increasing,with a growth rate of 116.47%.The average carbon intensity in Yulin from 1990 to2020 will increase year by year,with an overall increase in carbon intensity per capita and an overall decrease in carbon intensity per unit of gross domestic product The overall carbon intensity in Yulin from 1990 to 2020 will be the highest in the northwest area and the lowest in the southeast area of the city.The total carbon emission in the six northern counties is much higher than that in the six southern counties,and the changes of total carbon emission mainly occur in the six northern counties,while the six southern counties are more stable and have no obvious changes.(4)There is a significant spatial correlation between ecosystem service values and land-use-related carbon emissions in Yulin from 1990 to 2020,with overall negative correlations,including positive spatial correlations in 1990 and negative spatial correlations in2000,2010 and 2020.Yulin was dominated by low-low and low-high aggregations in 1990 and 2000,and low-high and high-low in 2010 and 2020.