Research On Urban Landscape Ecological Health Assessment And Optimization Strategy

Jiaozuo is a regional central city of the Central Plains urban agglomeration of the country and a sub-core city of the Zhengzhou metropolitan area.Due to the long-term high-intensity development and construction of human beings and the continuous changes of the natural environment,there are a large number of ecological degradation problems in the region.Therefore,exploring the relationship and changes between landscape types and pattern characteristics,ecological health level and driving factors,and what specific ways exist in regional development in Jiaozuo City are of great significance for maintaining the ecological environment of Jiaozuo City,promoting the economic and social development of cities in the Central Plains and the development and transformation of resource-exhausted cities.Urban landscape ecological health can provide an important basis for the regulation of natural resources and ecological environmental protection at the urban spatial scale in a scientific and effective manner.In view of this,this paper sorts out the relevant theories and domestic and foreign research literature,takes resource-depleted urban Jiaozuo as a research example,uses geographic information system(GIS)and remote sensing(RS)technology,and selects indicators from natural and socio-economic aspects on the basis of analyzing the changes of landscape types and patterns in Jiaozuo City in 2000,2010 and 2020,and reveals the spatial distribution characteristics and evolution law of landscape ecological health in Jiaozuo City in 20 years.Based on the evaluation results,the optimization strategy of urban landscape ecological health was explored by controlling zoning and constructing ecological corridors,which provided reference for the development and construction,ecological restoration and protection of resource-depleted cities including Jiaozuo City.The main research results of this paper are as follows:(1)Using the CiteSpace platform and literature analysis,the concepts,theoretical basis and evaluation methods related to ecological health are sorted out,and the research and development at home and abroad are discussed.The results show that there is a strong correlation between ecosystem health and landscape ecological health,and related research is still developing.The research on mineral resources cities of the research object still needs to be deepened;Indicator selection is less based on landscape pattern and other visual indicators for research on temporal and spatial scale;In the study of optimization strategy,optimization suggestions are mostly put forward from a macro perspective according to policies,and there is a lack of targeted guidance for regional ecological environment optimization construction.(2)Based on the classification standards of satellite images and landscape types,combined with support vector machines and other methods,the landscape types of Jiaozuo City were identified and divided,and the landscape types and landscape pattern evolution characteristics were analyzed.The results show that cultivated land is the main land use type in Jiaozuo City,accounting for more than 55% in 20 years,and gradually there is a trend of transfer to construction land and forest land,the land use dynamics of construction land are the highest,the stability of landscape first rises and then decreases in 20 years,landscape fragmentation continues to intensify,and there are a series of problems in the region,such as the decline of landscape ecological functions and the aggravation of ecosystem structure fragility.(3)According to the "pressure-state-response" model(PSR)and "vitality-organization-resilience-function" theory,13 visual indicators were selected,an evaluation index system was established,and the indicators were weighted by the analytic hierarchy method(AHP)and entropy weight method(EWM)integrated models,and the comprehensive index method and natural interruption point method were used to evaluate and grade the ecological health of the landscape from 2000 to 2020.The results showed that the ecological health of the landscape in Jiaozuo City showed a change of first increase and then a slight decrease in the past 20 years,and the grade conversion was relatively stable,and the cross-level transfer was rarely achieved.Through the correlation analysis of GeoDa software,the global Moran’s I index showed a trend of first declining and then rising,and the local LISA analysis was dominated by the high-high type.(4)In the research of optimization strategy,by reducing human interference,optimizing spatial layout,and improving management mechanism,it provides corresponding solutions for the improvement of landscape ecological health in Jiaozuo City.Among them,the spatial layout was optimized and the evaluation results were used as the basis for selecting ecological source areas,with a total of 62 ecological source areas.Using the circuit theory connectivity model to construct ecological corridors,a total of 162 optimal ecological corridors and 7 potential ecological corridors were obtained,and ecological grips and obstacles were identified through the Circuitscape platform,with a total of 42 grips and 52 ecological obstacle points.