| In this paper,Yandu District of Yancheng City is taken as the research object,and the landscape spatial pattern of Yandu District of Yancheng City is analyzed by the quantitative method of landscape ecology.Firstly,according to the basis and principle of landscape ecological classification,as well as the characteristics and research purposes of the study area,Yandu urban landscape is divided into six land use types:construction land,water area,cultivated land,grassland,woodland and unused land by eCognition software platform.Then,using the current land use map of Yandu District in 2010 and 2018 as the main information source,using the image data processing function of GIS software AicView3.3,the spatial data and attribute data of five landscape types in Yandu District were extracted.On this basis,based on Frgstats platform,several different landscape pattern indicators were selected,and the heterogeneity index of landscape spatial pattern was calculated by using landscape pattern index software FRAGSTATS 4.2.The results show that:(1)The largest area of land use type in Yandu area is cultivated land,followed by water area,construction land,woodland,grassland and unused land.Construction land mainly distributes in the eastern part of Yandu area,water mainly distributes in the western part of Yandu area,and cultivated land is scattered.From 2010 to 2018,the land use structure has changed greatly.There is a phenomenon of mutual transformation among different types of land use.The growth rate of forest land area is 139%.The growth rate of construction land area is 90%.The grassland area has decreased by 89%.The cultivated land area has decreased by 19%.In the aspect of unused land development,unused land is mainly converted to cultivated land and water area,with an area of 1.66 km2 and 2.46 km2,respectively.(2)In terms of landscape type level,the patch shape index values of cultivated land landscape type,grassland landscape type,waterscape landscape type and unused land in land use landscape from 2010 to 2018 showed an increasing trend,while the patch shape index values of forest land landscape type and construction land landscape type showed a decreasing trend,and the distribution of unused land and grassland was different.Cloth tends to be complicated.In 2010,the patch shape index of landscape types was grassland landscape(0.58)>forest landscape 0.512>construction land landscape(0.329)>unused land(0.317)>cultivated land(0.213)>water area(0.176);the aggregation index was cultivated land(93.675)>water area(82.427)>unused land(68.291)>construction land(67.134)>forest land(48.737).(41.195).The fragmentation degree of landscape types increased,and the degree of aggregation of different landscape types showed imbalance,and the degree of imbalance in 2018 was stronger than that in 2010.(3)From 2010 to 2018,the landscape spread index decreased from 66.3097 to 51.635,the fragrance diversity index increased from 0.7957 to 1.0726,and the evenness index increased from 0.4441 to 0.5986.Landscape heterogeneity is at a medium to low level.The degree of agglomeration among different plate types in this area is not strong,and there is no good trend of connectivity and extension.The dominant position of dominant landscape types has not changed.(4)Through the analysis of landscape spatial pattern index,this paper discusses the characteristics of landscape ecological spatial pattern in Yandu District,analyses the problems existing in the urban landscape ecological spatial pattern in Yandu District of Yancheng City,and puts forward the countermeasures and measures of urban landscape ecological optimization according to the principle of landscape ecological spatial pattern optimization:Suggestions for Yandu District Department We should learn to formulate long-term plans for ecological protection and utilization,establish multi-dimensional protection of green landscape,increase investment in infrastructure construction and improve urban ecological support system. |
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