A Study On Cross-sensitivity Of Land Use Transition And Ecosystem Service Value Of Chengdu-chongqing Region

At present,China is in the stage of rapid urbanization development.The economic construction and development of the previous single-target planning has caused the disconnection and imbalance between the social economy and the ecological environment system.Land use transformation is a direct manifestation of urbanization development.Ecosystem function is an important system that human beings rely on for survival and development.Ecosystem service value is one of the important indicators to measure ecosystem function.Exploring the correlation between land use transformation and ecosystem is an important way to ensure the sustainable development of social economic development system and ecosystem under the background of the development of ecological civilization.Under the guidance of ecology and sustainable development theory,combined with geographic information system and economics,based on the land use database of Chengdu-Chongqing region,exploring the spatial-temporal dynamics of the apparent transition of land use in 2000,2005,2010,2015 and 2018;And adopt the equivalent method and the pixel correction method to quantitatively explore the characteristics of the temporal and spatial changes of the ecosystem service value caused by the transformation of land use,and quantify the "green water and green mountains" as "golden mountains and silver mountains";Finally,based on the elasticity theory,it studies the degree of cross-sensitivity between land use transition and ecosystem service value and conducts sensitivity zoning research to provide optimization suggestions for promoting ecosystem construction and accelerating the harmonious development of regional economy.The results show that:(1)The study area has the largest conversion rate of cultivated land and the largest conversion rate of construction land in the past 20 years;the comprehensive land use change rate in terms of quantity,the comprehensive land change rate of construction land is significantly higher than others gentle.The core density of land use transformation during the four periods,the overall transformation density of the study area increased first and then decreased;In terms of spatial distribution,the transformation intensive areas are mainly in the first line of Chengdu-Ya’an-Mianyang in the west of the study area,and in the east The main city of Chongqing—the first line of Kaizhou District and one point in central Zigong City;areas with a rapid urbanization process generally have a high transformation density,and areas with a slower urbanization process have a low land transformation density.In the land use transformation,the center of gravity of newly-added construction land moves first to the southeast and then to the southwest.The center of gravity moves mainly horizontally in the southwest direction,and the north and south moves little upward.(2)From 2000 to 2018,the ecosystem service value of the study area experienced a process of first decreasing,then increasing and then decreasing,showing a downward trend as a whole;In terms of spatial distribution,it shows a bowl-shaped distribution pattern of “high outside and low inside”.The west is high and the east is the next,and the middle is the lowest;its rate of change presents a spatial distribution characteristic of "decrease outside and increase inside".(3)The mutual transformation of cultivated land and construction land,as well as the related transformation between cultivated land and forest land,are more sensitive to the impact of ESV.Among them,the value of ecosystem services is most sensitive to the mutual transformation of cultivated land and construction land;The mutual transformation of woodland and grassland,construction land,and water area and construction land followed.(4)Divide the research into urban development functional areas,ecological protection functional areas,and cross-transition functional areas,and propose ecosystem service value guarantee countermeasures for different types of areas based on cross-sensitivity characteristics;And by means of territorial and spatial planning,the ecosystem service function is integrated with the planning system,and ecological protection analysis is carried out from four aspects: goal setting,planning analysis,control policy,and multi-subject participation.