| City is a kind of complex ecosystem which is closely combined by artificial environment and natural environment.Ecosystem service is the condition for human survival and development.Rapid industrialization and urbanization have caused great damage to the urban landscape pattern and natural ecosystem and italso caused a series of ecological problems such as air pollution,heat island effect and so on.The comprehensive evaluation of the ecosystem service function of the urban landscape and the evaluation of ecosystem service contributions of different land types are of great scientific significance for optimization and regulation of landscape conversion and urban ecological environment construction under the influence of urbanization.This article took the beltway of Chongqing city as the research area,took the 2 high-resolution image of the research area(2013 and 2016)as the data source,adopted the landscape index method to analyze the land use landscape pattern in the study area,and adopted the direct market method,the shadow project and the equivalence factor method to evaluate the positive and negative ecological service values,analyzed the spatial pattern of ecological service value based on the grid,and used the spatial autocorrelation analysis method to explore the spatial concentration of the value of the composite ecological service,and finally adopted the Redundancy Degree Analysis(RDA)to analyze the association mechanism between the two groups of variables of landscape index and ecological service value,and raised the value of ecological services as the goal,and made relevant recommendations.To sum up,we reached the following conclusions:(1)In the study area are mainly cultivated land,forestland and construction land.From 2013 to 2016,the area of cultivated land,woodland,grassland and water area all showed a downward trend,and the decrease of cultivated land was the largest.The increase of construction land and bare land comes from cultivated land and grassland.The conversion of cultivated land,forestland and grassland is frequent,the difference of forestland conversion is not obvious,and the water area is almost not involved in the transformation.In space,the change in the core region is very small,even no change,the peripheral changes are obvious.(2)From 2013 to 2016,the composite ecological service value and total positive ecological service value in the region both showed a downward trend,which was mainly reflected in the decrease of the median value areas and increase of the low value areas;Although the value of the negative ecological service was also slightly reduced,the value of other changes was the opposite.Spatially,the value of ecological service was in a vertical zonal distribution,and the value of the ecological service was obviously spatial autocorrelation.The "high and high" type area was distributed in the north and south of the edge of the research area,and the "low and low" area was distributed in the central core area.(3)There was a high correlation between landscape index and ecological service value.The positive eco-service value was positively correlated with the PD,NP,AWMSI,and CONTAG indices in the landscape index,negatively related to the IJI and SHDI index,and negative ecological service value was opposite.When the landscape was more concentrated and the shape was more regular,the positive ecological service value would be greater.On the contrary,the negative ecological value would be greater. |
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