| In the recent more than 10 years,with the rapid development of social economy,the exploitation intensity of the natural environment is increasing day by day,human activities dramatically change the natural environment and ecosystem,ecosystem balance is affected.The surge in population,the pollution of water and soil resources,and the destruction of atmospheric environment have affected human health and well-being.It is necessary to change the existing development model.The results of ecosystem services evaluation and landscape ecological risk evaluation can reflect regional ecological security to some extent,but the guidance of single evaluation on regional ecological protection is weak.At present,it is necessary to explore the correlation between the two,clarify the internal logic and interaction mechanism of the two,and put forward the measures to maintain the ecosystem services and reduce the regional ecological risk.Based on the land use data in 2010,2015 and 2018,this thesis is titled "Study on the relationship between ecosystem services and landscape ecological risk and spatial countermeasures in Ji’an City",Taking Ji’an City 13 counties as research objects.First,Ji’an City’s habitat quality,carbon storage and soil maintaining service function is measured by In VEST model,and the integrated ecosystem services of Ji’an City have been formed.Secondly,the landscape index method is used to measure the landscape ecological risk of Ji’an City,and then use Spearman correlation analysis and spatial self-related models to explore the correlation between ecosystem services and landscape ecological risks,and they have been significantly negatively correlated in quantity and space.Finally,based on the spatial relevance of the two,the optimization countermeasures and control measures for the three-line,the main conclusions are as follows.1.Ji’an City ecosystem services present a continuous decline.A quantitative evaluation of Ji’an City’s habitat quality,carbon storage and soil holding service function is obtained through the Invest Model.The three types of ecosystem services in 2010-2018 have presented a descending trend.Ji’an City integrated ecosystem services also present a continuous decline through spatial overlay analysis.2.Landscape ecological risk in Ji’an City showed a trend of first rising and then falling.Based on the establishment of ecological risk communities,this thesis uses the landscape index method to select the landscape disturbance degree,landscape vulnerability degree and landscape loss degree to measure the landscape ecological risk level of each risk community.It is obtained that the comprehensive index of landscape ecological risk in Ji’an City from 2010 to 2018 shows a trend of first increase and then decrease.Then,Ji’an City was divided into five levels of risk areas by the Kriging difference method.By calculating the area of risk areas at all levels,the landscape ecological risk of Ji’an City increased first and then decreased from 2010 to 2018.3.Ji’an City ecosystem services and landscape ecological risks presents significant negative correlations in space and quantity.Through spearman correlation analysis,the spearman correlation factor of Ji’an City 2010-2018 is negative,and the correlation coefficients are less than-0.9,which indicates that there is a strong negative correlation in quantity.Then,the global Moran index of Ji’an City 2010-2018 ecological service and landscape ecological risk is negative,which indicates that the two have significant negative correlations in space,with high-risk and high-function areas dispersion of distribution;low-risk and low-function areas mainly distributed in the edge of economically developed regions;low-risk and highfunction areas concentrated in the southeast and western part of Ji’an;high-risk and lowfunction areas concentrated in the central part of Ji’an City and Northeast.And based on the above studies,optimization strategies and control countermeasures are proposed for the threeline. |
PDF Full Text Request