Abstract
In order to evaluate the change of ecosystem service value in Chengdu, GIS technology was used to obtain the land use type data of Chengdu from 2009 to 2018. The equivalent factor method was used as the core evaluation method, and an ecosystem value evaluation model was established to explore the impact of various land use types on ecosystem service value. The results show that: (1) the trend of land use change is that both the area and the proportion of land use change in different degrees. The area of cultivated land, water area and unused land are greatly reduced, and the area of construction land expands rapidly, mainly through the occupation of cultivated land and unused land. (2) The intensity of land use in Chengdu is greater and continues to increase, and the contribution rate of construction land is larger, which indicates that the land use structure is developing towards the structural direction of mainly construction land. (3) Changes in ecosystem service value are not only related to land use structure, but also to the economic development, willingness to pay and ability of the whole society. (4) Ecosystem service value is negatively correlated with construction land and unused land; it is positively correlated with cultivated land, forest land and grassland. Generally speaking, Chengdu’s land use change has not caused obvious damage to the ecosystem, but the impact of human lifestyle on the environment in the process of economic development cannot be ignored. The growth of construction land area should be appropriately controlled, ecological land should be protected, and the sustainable development of social-economic-ecological benefits should be realized.
Highlights
(4) Ecosystem service value is negatively correlated with construction land and unused land; it is positively correlated with cultivated land, forest land and grassland
The land use data from the chengdu city bureau of land and resources to carry out the second national land survey of statistical survey data of land use change, land use classification in accordance with national standards and the geological features of chengdu, chengdu city land use types can be divided into farmland, forest land, garden land, grassland, water area and wetland, construction land and unused land six grade class
(2)Chengdu's land use intensity is relatively high and continues to increase: with the acceleration of urbanization and industrialization in Chengdu, the intensity level of land use is developing to a higher level and will continue to increase. the contribution rate of construction land is relatively large, which indicates that Chengdu's land use structure is developing towards a structure dominated by construction land
Summary
Chengdu is located on the western edge of Sichuan Basin, with a terrain sloping from northwest to southeast. The plain area ratio is significant, reaching 4,971.4 square kilometers, accounting for 40.1% of the city's total land area. In 2018, the per capita disposable income of all residents in Chengdu was 36,142 yuan, up 8.8% year on year. The per capita disposable income of urban residents was 42128 yuan, up 8.2% year-on-year, 0.1 percentage point higher than that of the whole province. Per capita disposable income of rural residents was 22,135 yuan, up 9.0% year on year, the same as that of the whole province. The added value of the primary industry reached 52.259 billion yuan, up 3.6%. The added value of the secondary industry reached 651.619 billion yuan, up 7.0%. The added value of the tertiary industry reached 830399 million yuan, up 9.0%. The three industrial structures are 3.4: 42.5: 54.1
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