The Landscape Pattern Change And Ecosystem Health Assessment Of Yalu River Coastal Wetland

Yalu River Estuary Coastal Wetland is one of the important coastal wetlands of Liaoning Province,but due to unreasonable exploitation and utilization,the ecological health situation is worrying,therefore doing some evaluations of the situation seems very significant.The essay builds a wetland classification system based on the RS and GIS technology from 1995,2005,2015 of the Yalu River coastal wetland remote sensing image,analyses changes in the area based on the area of transfer matrix and landscape pattern index,the double screening of stepwise regression is used to study driving mechanism.Meanwhile,this paper defines landscape ecological health and it's characteristics by combining the existing information,and constructs evaluation index system from the hydro meteorology,landscape features,ecological functions,human disturbance elements these four aspects.By using a combination of AHP and entropy sets up a game theory aggregation model,using the Weber Fechner law to make quantitative ecological health assessment and analysis of the Yalu River Estuary Wetlands.The results show that:(1)The tidal flats,seaward grass and reeds area has been reduced,its area is reduced by 80.7363km~2,55.1898km~2,3.303km~2,construction land,rice paddies,artificial salt marsh area has been on the rise,its area is increased by 42.2856km~2,42.2856km~2,22.5126km~2,seaward forest land and other land area shows a trend of increase after the first reduce.(2)All kinds of different wetland types is changing in plaque numbers,landscape ecological condition is getting worse and worse.The distribution uniformity,diversity and complexity of wetland landscape is first reduced and then increased,it's the same situation of fragmentation degree and aggregation degree.(3)Climate,hydrology and other natural causes is the basis of influence of various kinds of coastal wetland landscape changes,population growth,economic development,improvement of urbanization level,scientific and technological progress and human factor are the the main driving factors of landscape changes.(4)From 1995 to 2015,the ecological service function value total declines after increasing.In 1995,the ecosystem service value for shallow tidal?intertidal zone?coastal grassland?coastal land?river?paddy soil?reed?other land?artificial salt marsh?land for construction.In 2015,ecological service value shows shallow sea beach?intertidal zone?paddy soil?coastal land?land for construction?river?coastal grassland?reed?other land?artificial salt marsh by arrangement.(5)The landscape vulnerability index of Yalu River Coastal Wetland are 22.59,22.773,22.186 in 1995,2005,2015.The landscape vulnerability index decreases after the first increases,sensitivity to interference is decreased after first increased.(6)The landscape ecological health index are 0.202,0.167,0.079 in 1995,2005,2015,the landscape ecological health situation presents change from health to critical health to unhealthy.Landscape vulnerability and ecological health has some relevance,the greater the vulnerability of landscape,the more sensitive to external disturbance,the worse the landscape ecological health.Finally,according to landscape changes,driving mechanism and ecological health problems of this area,I put forward countermeasures from wetland resources conservation,management,restoration three aspects to provide reference for decision-makers about exploitation and utilization of coastal wetlands resources.