Temporal And Spatial Evolution And Health Evaluation Of Mountain,Water,Forest,Farmland,City And Sea Life Community In Typical Land-sea Integrated Area

The watershed-bay is the core transition zone of coupling land and sea ecosystem.It is a complex community of life,consisting of mountain,water,forest,field,city,sea and other ecological subsystems.It is an important guarantee for the coordinated development of economic construction and ecological health to scientifically and rationally analyze the temporal and spatial evolution characteristics of the sub-system and evaluate its health status.From the perspective of land-sea integration,this paper takes Pinglu canal-sea catchment-Maowei Sea as the research area.Firstly,the temporal and spatial evolution patterns of the subsystems such as mountains,rivers,forests,farmland,city and sea are analyzed,and the main explaining factors of each subsystem are identified by Geo Detector.Secondly,the evaluation index system of life community of watershed and bay was constructed,and the ecological health evaluation of life community of mountain,water,forest,farmland,city and sea was carried out by using Composite index method.Finally,the coupling coordination model is used to analyze the coupling coordination degree of each subsystem combination of mountain,water,forest,farmland,city and sea.The results show that:(1)The mountainous area is small and only distributed in southwest and northwest China.The water area was small,mainly distributed in rivers and coastal pits,and decreased to some extent.Woodland area is wide,cover scope is big,have increasing tendency.The land is mainly distributed along the river banks,and there is a significant decline trend.The urban distribution is scattered,concentrated in the coast and county center and other economically developed areas,and continues to expand to the periphery.From 2011 to 2015,population density and urban area were the main explanatory factors of water area.Topographic humidity was the main factor affecting the change of forest land,and the intensity of temperature also increased gradually.Urban area and topographic humidity are the main influencing factors of land change,while population density and per capita income are increasing.(2)The overall health status of the life community is general,which is in the unhealthy level,and the ecological health level needs to be improved.The ecological health status of all subsystems is general,except that of the mountain,which is good,and the ecological health of other subsystems is poor.From the perspective of the two major systems of the land and sea,the ecological health of the land is general,which is mainly sub-health and under-health The health status of class I health zones in the land is good and stable,and the ecological health of the rest of the land health zones is general with different types of ecological pressure.The ecological health of the rest of the land health zones is general,and the ecological health of the rest of the land health zones is general.The ecological health of the rest of the land health zones is general,and the ecological health of the rest of the land health zones is general with the ecological health of the rest of the land health zones From the perspective of change,the health status of terrestrial life community was good and stable from 2007 to 2015,and the number of villages and towns deteriorated sharply from 2015 to 2020,and the coastal areas moved to the short distance from the countryside(3)The coupling coordination between the two subsystems is poor and tends to deteriorate.The main type of coupling coordination is transitional coordination.The coupling coordination among the three subsystems is not good,and the coupling coordination degree decreases slightly.The coupling coordination among the four subsystems is not good,and the coupling coordination degree decreases slightly.The main types of coupling coordination are basic coordination and transition coordination.The coupling coordination among the five sub-systems is general,but the coupling coordination degree decreases slightly.The main types of coupling coordination are basic coordination types.The coupling coordination among the six subsystems is good and the coupling coordination degree is stable.