| Ecological risk assessment is an important method for ecological protection and monitoring,especially for small and medium-sized developing tourist cities,ecological risk assessment is a necessary measure to balance the contradiction between ecological environment and social and economic development.Traditional methods of regional ecological risk assessment are difficult to integrate the influence of human and nature,and evaluate the spatiotemporal evolution pattern of ecological risks from a multi-level,multi-angle,long-term perspective.This paper selects 6 phases of land use remote sensing monitoring data and other social statistical data released by the Chinese Academy of Sciences with a resolution of 30 m,analyzes the changes of regional land use characteristics and the temporal and spatial evolution of landscape patterns,and discusses the methods of regional ecological risk assessment.Ganzhou City has established a landscape ecological risk evaluation model and a comprehensive evaluation model of land use ecological risk for the demonstration of ecological risk evolution.Mainly carried out the following research work:(1)Data collection and screening.Comprehensively considering the possible impact of human factors and geographical features on the ecological environment,on the basis of collecting a variety of natural data and social statistical data,based on 6 phases of land use remote sensing monitoring data with a resolution of 30 m as the basis,the data from 2000 to2020 were extracted.Statistical yearbook and statistical bulletin data,after statistics,overlay,clipping,fusion,etc.,are classified into four categories according to data types: land use data,natural condition indicator data,social development indicator data,and auxiliary data.(2)Regional spatiotemporal evolution analysis.By extracting and superimposing various types of land use remote sensing monitoring data to generate a transition matrix,the changes of land use characteristics are analyzed from three aspects: land use structure,land use transfer and land use degree;by extracting regional land use type patches,from the landscape pattern The spatial and temporal evolution of the landscape pattern was analyzed from two aspects: the patch type level and the overall landscape level,and the method of landscape pattern gravity center shift was introduced to compare and verify the two regional temporal and spatial evolution analysis methods.The results show that the change of land use characteristics can represent the regional land use types on a macro level,and the temporal and spatial evolution of the landscape pattern can represent the land use evolution locally.Make the analysis more comprehensive.Various land types in Ganzhou experienced different degrees of temporal and spatial evolution from 2000 to 2020,and the overall trend is diversified development.In the future,more attention should be paid to the impact of advantageous land use types,forest land,cultivated land,and construction land with the most active land evolution on the ecological environment.(3)Ecological risk assessment.Based on the analysis of temporal and spatial evolution,combined with the influence of human and natural factors,the ecologically significant landscape pattern index was introduced into the ecological risk community.Through the Moran’s I index and LISA aggregation autocorrelation verification,a landscape ecological risk assessment model in the study area was constructed.;In addition,taking 2020 as an example,using the "pressure-state-response"(PSR)model,the analytic hierarchy process(AHP)was used to select 9 ecological impact indicators at three levels,and visualized the "pressure-stateresponse" 2020 in the study area.The current situation of the study area was established,and a comprehensive evaluation model of land use ecological risk in the study area was constructed.The experimental results show that the Moran’s I index and LISA have strong spatial autocorrelation,and the results of landscape ecological risk assessment are consistent with the spatial distribution of comprehensive assessment results of land use ecological risks.Both models effectively describe the security level and status of land ecological risks in the study area.From 2000 to 2020,the overall ecological environment of Ganzhou City will develop for the better.Based on the remote sensing monitoring data of land use,the paper analyzes the changes of regional land use characteristics and the temporal and spatial evolution of landscape pattern,and constructs a landscape ecological risk assessment model based on the ecologically significant landscape pattern index.Combined with the natural condition index data and social development index data A comprehensive evaluation model of land use ecological risk was developed.The final integration constitutes an ecological risk assessment framework based on land use data and supplemented by statistical data,thus providing empirical evidence for ecological risk assessment in Ganzhou.The research methods and conclusions have certain reference value for the same type of urban ecological risk assessment. |
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